Journal articles: 'NMR magnetometry'

1

Cowan, Brian. "Asymmetric NMR lineshapes and precision magnetometry." Measurement Science and Technology 7, no. 4 (April 1, 1996): 690–95. http://dx.doi.org/10.1088/0957-0233/7/4/028.

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Flay, D., D. Kawall, T. Chupp, S. Corrodi, M. Farooq, M. Fertl, J. George, et al. "High-accuracy absolute magnetometry with application to the Fermilab Muon g-2 experiment." Journal of Instrumentation 16, no. 12 (December 1, 2021): P12041. http://dx.doi.org/10.1088/1748-0221/16/12/p12041.

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Abstract We present details of a high-accuracy absolute scalar magnetometer based on pulsed proton NMR. The B-field magnitude is determined from the precession frequency of proton spins in a cylindrical sample of water after accounting for field perturbations from probe materials, sample shape, and other corrections. Features of the design, testing procedures, and corrections necessary for qualification as an absolute scalar magnetometer are described. The device was tested at B = 1.45 T but can be modified for a range exceeding 1–3 T. The magnetometer was used to calibrate other NMR magnetometers and measure absolute magnetic field magnitudes to an accuracy of 19 parts per billion as part of a measurement of the muon magnetic moment anomaly at Fermilab.

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Xu, M., M. D. Hossain, H. Saadaoui, T. J. Parolin, K. H. Chow, T. A. Keeler, R. F. Kiefl, et al. "Proximal magnetometry in thin films using NMR." Journal of Magnetic Resonance 191, no. 1 (March 2008): 47–55. http://dx.doi.org/10.1016/j.jmr.2007.11.022.

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Fraser, Hector W. L., Gary S. Nichol, Dušan Uhrín, Ulla Gro Nielsen, Marco Evangelisti, Jürgen Schnack, and Euan K. Brechin. "Order in disorder: solution and solid-state studies of [MIII2MII5] wheels (MIII = Cr, Al; MII = Ni, Zn)." Dalton Transactions 47, no. 34 (2018): 11834–42. http://dx.doi.org/10.1039/c8dt00685g.

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Selvanathan, Pramila, Vincent Dorcet, Thierry Roisnel, Kévin Bernot, Gang Huang, Boris Le Guennic, Lucie Norel, and Stéphane Rigaut. "trans to cis photo-isomerization in merocyanine dysprosium and yttrium complexes." Dalton Transactions 47, no. 12 (2018): 4139–48. http://dx.doi.org/10.1039/c8dt00299a.

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A unique light-switching behavior is revealed in Yttrium(iii) and Dysprosium(iii) merocyanine complexes through NMR and AC magnetometry experiments. Its impact on slow relaxation of magnetization is described.

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Schmidt, Robert D., Caleb A. Kent, Javier J. Concepcion, Wenbin Lin, Thomas J. Meyer, and Malcolm D. E. Forbes. "A little spin on the side: solvent and temperature dependent paramagnetism in [RuII(bpy)2(phendione)]2+." Dalton Trans. 43, no. 47 (2014): 17729–39. http://dx.doi.org/10.1039/c4dt01868k.

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Magnetometry, ¹H-NMR, EPR and substituent effects are used to explain solvent and temperature dependent paramagnetism in [Ru^II(bpy)₂(phendione)](PF₆)₂.

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Grisi, Marco, Gaurasundar Marc Conley, Pascal Sommer, Jacques Tinembart, and Giovanni Boero. "A single-chip integrated transceiver for high field NMR magnetometry." Review of Scientific Instruments 90, no. 1 (January 2019): 015001. http://dx.doi.org/10.1063/1.5066436.

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Martel, Laura, Thibault Charpentier, Pedro Amador Cedran, Chris Selfslag, Mohamed Naji, Jean-Christophe Griveau, Eric Colineau, and Rachel Eloirdi. "Insight into the Crystal Structures and Physical Properties of the Uranium Borides UB1.78±0.02, UB3.61±0.041 and UB11.19±0.13." Minerals 12, no. 1 (December 24, 2021): 29. http://dx.doi.org/10.3390/min12010029.

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In this study we reported the synthesis of three polycrystalline uranium borides UB1.78±0.02, UB3.61±0.041, and UB11.19±0.13 and their analyses using chemical analysis, X-ray diffraction, SQUID magnetometry, solid-state NMR, and Fourier transformed infrared spectroscopy. We discuss the effects of stoichiometry deviations on the lattice parameters and magnetic properties. We also provide their static and MAS-NMR spectra showing the effects of the 5f-electrons on the 11B shifts. Finally, the FTIR measurements showed the presence of a local disorder.

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Zagorsky D. L., Doludenko I. M., Khaibullin R. I., Chuprakov S. A., Gippius A. A., Zhurenko S. V., Tkachev A. V., et al. "Synthesis features, structure, magnetometry and NMR spectroscopy of nanowires of various types." Physics of the Solid State 64, no. 9 (2022): 1158. http://dx.doi.org/10.21883/pss.2022.09.54144.25hh.

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Various types of nanowires obtained by matrix synthesis --- homogeneous (from iron) and heterogeneous (layered) --- have been studied. A technique for obtaining arrays of layered nanowires with alternating thin layers of magnetic and non-magnetic metals (Co/Cu, Ni/Cu) has been developed and described. Microscopy methods (SEM and TEM with elemental analysis) have been used to study the topography of the resulting structures, the diameters of nanowires and the thicknesses of individual layers, and the features of interlayer interfaces. Methods of synthesis of nanowires with thin layers and clear boundaries are proposed --- dilution of the electrolyte, use of a reference electrode, control of the leaked charge. Layered nanowires have been studied by magnetometry methods and it has been shown that the magnetic properties of an array of layered nanowires (in particular, the direction of the axis of light magnetization in the Co/Cu-NP array) depend not only on the aspect ratio of the magnetic layer, but also on the ratio of the thickness of the magnetic metal layer to the thickness of a non-magnetic spacer (copper layer). The nuclear magnetic resonance (NMR) method was used to study two types of nanowires. The NMR method (on 59-Co nuclei) studied the layer structures of Co/Cu: it is shown that in nanowires with layers of smaller thickness (and, accordingly, with a large contribution of interfaces), a large proportion of Co atoms coordinated by Cu atoms is observed. The high proportion of atoms coordinated by copper suggests that an admixture of copper enters the cobalt layers. Homogeneous iron nanowires (NMR on 57-Fe nuclei) were compared with bulk iron samples. A shift of the line towards high frequencies (by 0.3 MHz) was detected, indicating an increase in the field by about 0.2 T. A significant broadening of the line and a decrease in the spin-lattice relaxation time may indicate a significant variation in the local magnetic field values. Keywords: nanowires, matrix synthesis, microscopy, elemental analysis, magnetic properties, NMR.

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10

Bevilacqua, G., V. Biancalana, Y. Dancheva, and L. Moi. "All-optical magnetometry for NMR detection in a micro-Tesla field and unshielded environment." Journal of Magnetic Resonance 201, no. 2 (December 2009): 222–29. http://dx.doi.org/10.1016/j.jmr.2009.09.013.

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11

Маmniashvili, G., T. Gegechkori, М. Оkrosashvili, E. Kutelia, А. Аkhalkatsi, T. Gavasheli, D. Daraselia, et al. "Production of cobalt nanopowders by electron-beam technology and their NMR and magnetometry study." Journal of Magnetism and Magnetic Materials 373 (January 2015): 177–82. http://dx.doi.org/10.1016/j.jmmm.2014.03.058.

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Chow, G. M., L. K. Kurihara, K. M. Kemner, P. E. Schoen, W. T. Elam, A. Ervin, S. Keller, Y. D. Zhang, J. Budnick, and T. Ambrose. "Structural, morphological, and magnetic study of nanocrystalline cobalt-copper powders synthesized by the polyol process." Journal of Materials Research 10, no. 6 (June 1995): 1546–54. http://dx.doi.org/10.1557/jmr.1995.1546.

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Nanocrystalline CoxCu100−x (4 ⋚ x ⋚ 49 at. %) powders were prepared by the reduction of metal acetates in a polyol. The structure of powders was characterized by x-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), extended x-ray absorption fine structure (EXAFS) spectroscopy, solid-state nuclear magnetic resonance (NMR) spectroscopy, and vibrating sample magnetometry (VSM). As-synthesized powders were composites consisting of nanoscale crystallites of face-centered cubic (fcc) Cu and metastable face-centered cubic (fcc) Co. Complementary results of XRD, HRTEM, EXAFS, NMR, and VSM confirmed that there was no metastable alloying between Co and Cu. The NMR data also revealed that there was some hexagonal-closed-packed (hcp) Co in the samples. The powders were agglomerated, and consisted of aggregates of nanoscale crystallites of Co and Cu. Upon annealing, the powders with low Co contents showed an increase in both saturation magnetization and coercivity with increasing temperature. The results suggested that during preparation the nucleation of Cu occurred first, and the Cu crystallites served as nuclei for the formation of Co.

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Prando, Giacomo, Pietro Carretta, Alessandro Lascialfari, Attilio Rigamonti, Samuele Sanna, Laura Romanò, Andrea Palenzona, Marina Putti, and Matteo Tropeano. "Investigation of Fluctuating Diamagnetism and Spin Dynamics in SmFeAsO_1-xF_x Superconductors." Advances in Science and Technology 75 (October 2010): 141–46. http://dx.doi.org/10.4028/www.scientific.net/ast.75.141.

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The superconducting iron-pnictides SmFeAsO1-xFx (x = 0.15 and x = 0.2) are studied by means of 19F-NMR spectroscopy and SQUID magnetometry. Fluctuating diamagnetism above Tc is briefly examined, stressing the analogy with the phenomenology in underdoped cuprates. The 19F relaxation rate allows us to infer an indirect magnetic coupling between Sm3+ moments, possibly involving conduction electrons in FeAs bands, with no appreciable effects on crossing the superconducting transition temperature. A comparison between the superconducting samples and the insulating SmOF, often present as spurious phase in SmFeAsO1-xFx pnictides, is also carried out. Relevant differences in the spin dynamics features are found.

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14

Ikeue, Takahisa, Satoshi Kurahashi, Makoto Handa, Tamotu Sugimori, and Mikio Nakamura. "Electronic structure of five- and six-coordinate iron(III) tetraazaporphyrin complexes: pyrrole-Cαchemical shift as a useful probe." Journal of Porphyrins and Phthalocyanines 12, no. 09 (September 2008): 1041–49. http://dx.doi.org/10.1142/s1088424608000418.

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Electronic structure of a series of five-coordinate Fe ( OArTAzP ) X ( OAr = octaaryltetraazaporphyrin , X = Cl-, Br-, I-; Ar = 4-tert-butylphenyl) have been examined on the basis of1H NMR,13C NMR, and EPR spectroscopy as well as SQUID magnetometry. These complexes adopt the intermediate-spin state as in the case of analogous complexes reported by Fitzgerald et al. (Inorg. Chem. 1992; 31: 2006-2013) and Stuzhin et al. (Inorg. Chim. Acta 1995; 236: 131-139). The13C NMR studies using13C -enriched complexes at the pyrrole α positions have revealed that the pyrrole- Cαsignals appear at extraordinary upfield positions, i.e. -130 to -250 ppm at 273 K, due to the dz2-a2 uand dπ-3 eginteractions. The Curie plots of the pyrrole- Cαsignals have further revealed that the iodide complex adopts a much purer intermediate-spin state than the bromide and chloride complexes. In contrast to the case of Fe ( OArTAzP ) X , six-coordinate [ Fe ( OArTAzP )( CN )2]-showed the pyrrole- Cαsignal at 47 ppm at 273 K, which indicates that the complex adopts the low-spin state with the ( dxy)2( dxz, dyz)3electron configuration. Thus, the13C NMR chemical shift of the pyrrole- Cαsignal turns out to be quite a good probe to elucidate the spin state and electron configuration of iron(III) tetraazaporphyrins, where the1H NMR spectroscopy is less useful because of the absence of the hydrogen atoms as well as the alkyl or aryl groups directly attached to the meso positions.

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Urbano-Bojorge, Ana Lorena, Nazario Félix-González, Tamara Fernández, Francisco del Pozo-Guerrero, Milagros Ramos, and José Javier Serrano-Olmedo. "A Comparison of Magnetometry and Relaxometry Measures of Magnetic Nanoparticles Deposited in Biological Samples." Journal of Nano Research 31 (April 2015): 129–37. http://dx.doi.org/10.4028/www.scientific.net/jnanor.31.129.

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The Alternating Gradient Field Magnetometer (AGFM) is an instrument whose high sensitivity (10-8 emu) allows the detection of small amounts of magnetic nanoparticles (MNPs) with high accuracy. Over the last few years, different magnetic techniques have been used for in vitro measurements of magnetic nanostructures inside biological tissues. However, in vivo studies about their distribution within the body are very scarce because their dispersion, after being delivered, reduces their magnetic signal and hinders detection. In this paper we compare the longitudinal relaxation time (T1) and magnetization measurements in mice's biological tissues for the tracking of MNPs after of an injection of iron oxide nanoparticles. Furthermore, we have correlated the AGFM data with Fast Field Cycling NMR Relaxometry (FFCNMR Relaxometry) measurements with histological analysis. The results have demonstrated that these techniques are useful for detecting minute amounts of MNPs in excised organs after in-vivo comparable to other more conventional techniques for the measurement of MNPs biodistribution and clearance. Details about the preparation of the in vivo samples, measurement protocol and statistical data processing are given.

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16

Nikovskiy, Igor A., Alexander V. Polezhaev, Valentin V. Novikov, Dmitry Yu Aleshin, Rinat R. Aysin, Elizaveta K. Melnikova, Luca M. Carrella, Eva Rentschler, and Yulia V. Nelyubina. "Spin-Crossover in Iron(II) Complexes of N,N′-Disubstituted 2,6-Bis(Pyrazol-3-yl)Pyridines: An Effect of a Distal Substituent in the 2,6-Dibromophenyl Group." Crystals 11, no. 8 (August 8, 2021): 922. http://dx.doi.org/10.3390/cryst11080922.

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A series of new bis(pyrazol-3-yl)pyridines (LR) N,N′-disubstituted by 4-functionalized 2,6-dibromophenyl groups have been synthesized to study the effect of a distal substituent on the spin-crossover (SCO) behaviour of the iron(II) complexes [Fe(LR)2](ClO4)2 by variable-temperature magnetometry, NMR spectroscopy, and X-ray diffraction. The SCO-assisting tendency of the substituents with different electronic and steric properties (i.e., the bromine atom and the methyl group) in the para-position of the 2,6-dibromophenyl group is discussed. Together with earlier reported SCO-active iron(II) complexes with N,N′-disubstituted bis(pyrazol-3-yl)pyridines, these new complexes open the way for this family of SCO compounds to emerge as an effective ‘tool’ in revealing structure–function relations, a prerequisite for successful molecular design of switchable materials for future breakthrough applications in sensing, switching, and memory devices.

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Ngernpimai, S., C. Thomas, S. Maensiri, and Sineenat Siri. "Stability and Cytotoxicity of Well-Dispersed Magnetite Nanoparticles Prepared by Hydrothermal Method." Advanced Materials Research 506 (April 2012): 122–25. http://dx.doi.org/10.4028/www.scientific.net/amr.506.122.

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A preparation of well-dispersed magnetite nanoparticles was demonstrated in this study. Magnetite nanoparticles (MNPs) were synthesized by a hydrothermal method using aloe vera extract and serial centrifugation was employed to separate the sizes of well-dispersed particles. Well-dispersed MNPs with average sizes of 241, 227, 195, 165, 141 and 93 nm were obtained. They were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy and vibrating sample magnetometry (VSM). XRD results indicated the MNPs were Fe3O4. Magnetic hysteresis loop measurements of the samples showed superparamagnetic properties. Pulsed nuclear magnetic resonance (NMR) showed stable proton (1H) spin-spin relaxation time (T2) values of water with suspended magnetite nanoparticles over a time course of 20 min, suggesting they were well-dispersed. The synthesized magnetite nanoparticles showed low cytotoxicity to NIH 3T3 cells at concentrations of 1-10%.

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Shatan, Anastasiia B., Vitalii Patsula, Aneta Dydowiczová, Kristýna Gunár, Nadiia Velychkivska, Jiřina Hromádková, Eduard Petrovský, and Daniel Horák. "Cationic Polymer-Coated Magnetic Nanoparticles with Antibacterial Properties: Synthesis and In Vitro Characterization." Antibiotics 10, no. 9 (September 6, 2021): 1077. http://dx.doi.org/10.3390/antibiotics10091077.

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Uniformly sized magnetite nanoparticles (Dn = 16 nm) were prepared by a thermal decomposition of Fe(III) oleate in octadec-1-ene and stabilized by oleic acid. The particles were coated with Sipomer PAM-200 containing both phosphate and methacrylic groups available for the attachment to the iron oxide and at the same time enabling (co)polymerization of 2-(dimethylamino)ethyl methacrylate and/or 2-tert-butylaminoethyl methacrylate at two molar ratios. The poly[2-(dimethylamino)ethyl methacrylate] (PDMAEMA) and poly[2-(dimethylamino)ethyl methacrylate-co-2-tert-butylaminoethyl methacrylate] [P(DMAEMA-TBAEMA)] polymers and the particles were characterized by 1H NMR spectroscopy, size-exclusion chromatography, transmission electron microscopy, dynamic light scattering, thermogravimetric analysis, magnetometry, and ATR FTIR and atomic absorption spectroscopy. The antimicrobial effect of cationic polymer-coated magnetite nanoparticles tested on both Escherichia coli and Staphylococcus aureus bacteria was found to be time- and dose-responsive. The P(DMAEMA-TBAEMA)-coated magnetite particles possessed superior biocidal properties compared to those of P(DMAEMA)-coated one.

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Brero, Francesca, Martina Basini, Matteo Avolio, Francesco Orsini, Paolo Arosio, Claudio Sangregorio, Claudia Innocenti, et al. "Coating Effect on the 1H—NMR Relaxation Properties of Iron Oxide Magnetic Nanoparticles." Nanomaterials 10, no. 9 (August 24, 2020): 1660. http://dx.doi.org/10.3390/nano10091660.

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We present a 1H Nuclear Magnetic Resonance (NMR) relaxometry experimental investigation of two series of magnetic nanoparticles, constituted of a maghemite core with a mean diameter dTEM = 17 ± 2.5 nm and 8 ± 0.4 nm, respectively, and coated with four different negative polyelectrolytes. A full structural, morpho-dimensional and magnetic characterization was performed by means of Transmission Electron Microscopy, Atomic Force Microscopy and DC magnetometry. The magnetization curves showed that the investigated nanoparticles displayed a different approach to the saturation depending on the coatings, the less steep ones being those of the two samples coated with P(MAA-stat-MAPEG), suggesting the possibility of slightly different local magnetic disorders induced by the presence of the various polyelectrolytes on the particles’ surface. For each series, 1H NMR relaxivities were found to depend very slightly on the surface coating. We observed a higher transverse nuclear relaxivity, r2, at all investigated frequencies (10 kHz ≤ νL ≤ 60 MHz) for the larger diameter series, and a very different frequency behavior for the longitudinal nuclear relaxivity, r1, between the two series. In particular, the first one (dTEM = 17 nm) displayed an anomalous increase of r1 toward the lowest frequencies, possibly due to high magnetic anisotropy together with spin disorder effects. The other series (dTEM = 8 nm) displayed a r1 vs. νL behavior that can be described by the Roch’s heuristic model. The fitting procedure provided the distance of the minimum approach and the value of the Néel reversal time (τ ≈ 3.5 ÷ 3.9·10−9 s) at room temperature, confirming the superparamagnetic nature of these compounds.

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Kurahashi, Satoshi, Takahisa Ikeue, Tamotsu Sugimori, Masashi Takahashi, Masahiro Mikuriya, Makoto Handa, Akira Ikezaki, and Mikio Nakamura. "Formation and characterization of five- and six-coordinate iron(III) corrolazine complexes." Journal of Porphyrins and Phthalocyanines 16, no. 05n06 (May 2012): 518–29. http://dx.doi.org/10.1142/s1088424612500460.

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Electronic structures of five- and six-coordinate iron(III) corrolazine complexes are determined by means of 1H NMR, 13C NMR, EPR, and Mössbauer spectroscopy as well as SQUID magnetometry. A series of five-coordinate complexes, [FeIII(TBP8Cz)(L)]* where the axial ligands(L) are cyanide(CN-), imidazole(HIm), 1-methylimidazole(1-MeIm), 4-(N,N-dimethylamino)pyridine(DMAP), pyridine(Py), 4-cyanopyridine(4-CNPy), and tert-butylisocyanide(tBuNC), are obtained by the addition of 1 to 2 equiv. of the ligands to the dichloromethane solutions of FeIII(TBP8Cz) at 298 K: TBP8Cz is a trianion of 2,3,7,8,12,13,17,18-octakis(4-tert-butylphenyl)corrolazine. These complexes commonly show the S = 3/2 at 298 K. By contrast, formation of the six-coordinate complexes depends on the nature of the axial ligands. While the addition of 3 equiv. of CN- has completely converted FeIII(TBP8Cz) to (Bu4N)2[FeIII(TBP8Cz)(CN)2] at 298 K, the conversion to the bis-adduct is only attained below ca. 200 K in the case of HIm, 1-MeIm, and DMAP even in the presence of 50 equiv. of the ligands. If the axial ligand is Py, 4-CNPy, or tBuNC, the formation of [FeIII(TBP8Cz)(L)2] is confirmed only at an extremely low temperature (15 K). Close inspection of the 1H NMR and EPR spectra has revealed that all the bis-adducts adopt the (dxy)2(dxz, dyz)3 ground state. While FeIII(TBP8Cz) forms paramagnetic bis- and mono-adduct in toluene solution at 298 K in the presence of excess amount of CN- and tBuNC, respectively, the corresponding porphyrazine complex, [FeIII(TBP8Pz)]Cl , forms diamagnetic bis-CN and bis-tBuNC under the same conditions: TBP8Pz is a dianion of 2,3,7,8,12,13,17,18-octakis(4-tert-butylphenyl)-porphyrazine. Thus, the iron(III) ion of porphyrazine complex is more easily reduced than that of the corresponding corrolazine complex.

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Belova, S. A., A. S. Belov, N. N. Efimov, A. A. Pavlov, Yu V. Nelubina, V. V. Novikov, and Y. Z. Voloshin. "Synthesis, Structure, and Magnetic Properties of Ditopic Ferrocenylboron-Capped Tris-Pyridineoximate Iron, Cobalt, and Nickel(II) Pseudoclathrochelates." Russian Journal of Inorganic Chemistry 67, no. 8 (August 2022): 1151–57. http://dx.doi.org/10.1134/s0036023622080034.

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Abstract Tris-pyridineoximate iron, cobalt, and nickel(II) pseudoclathrochelates with apical ferrocenyl substituent were obtained in the reasonable yields (50–70%) in a boiling ethanol by the template condensation of 2-acetylpyridineoxime with ferrocenylboronic acid on the corresponding M2+ ion as a matrix. The composition and structure of new ditopic compounds, isolated in the forms of their ionic associates with perchlorate anion, were determined using elemental analysis, UV-vis spectroscopy, MALDI-TOF mass spectrometry, and NMR spectroscopy. According to the magnetometry data, the iron(II) pseudoclathrochelate is a diamagnetic compound, while the temperature dependences of magnetic susceptibility of the nickel and cobalt(II) complexes are characteristic of the high-spin systems with S = 1 and 3/2, respectively. As follows from the X-ray diffraction data for the iron and nickel(II) pseudoclathrochelates, the Ni–N distances (2.15–2.17 Å) are characteristic of the high-spin Ni2+ complexes, while they in its iron(II)-containing analog, slightly exceed of 2 Å, thus suggesting the low-spin state of this ion.

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Pavlov, Alexander A., Joscha Nehrkorn, Sergey V. Zubkevich, Matvey V. Fedin, Karsten Holldack, Alexander Schnegg, and Valentin V. Novikov. "A Synergy and Struggle of EPR, Magnetometry and NMR: A Case Study of Magnetic Interaction Parameters in a Six-Coordinate Cobalt(II) Complex." Inorganic Chemistry 59, no. 15 (July 16, 2020): 10746–55. http://dx.doi.org/10.1021/acs.inorgchem.0c01191.

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Chioma, Festus, Anthony C. Ekennia, Aderoju A. Osowole, Sunday N. Okafor, Collins U. Ibeji, Damian C. Onwudiwe, and Oguejiofo T. Ujam. "Synthesis, characterization, in-vitro antimicrobial properties, molecular docking and DFT studies of 3-{(E)-[(4,6-dimethylpyrimidin-2-yl)imino]methyl} naphthalen-2-ol and Heteroleptic Mn(II), Co(II), Ni(II) and Zn(II) complexes." Open Chemistry 16, no. 1 (March 20, 2018): 184–200. http://dx.doi.org/10.1515/chem-2018-0020.

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AbstractHeteroleptic divalent metal complexes [M(L) (bipy)(Y)]•nH2O (where M = Mn, Co, Ni, and Zn; L = Schiff base; bipy = 2,2’-bipyridine; Y = OAc and n = 0, 1) have been synthesized from pyrimidine Schiff base ligand 3-{(E)-[(4,6-dimethylpyrimidin-2-yl)imino]methyl} naphthalen-2-ol, 2,2’-bipyridine and metal(II) acetate salts. The Schiff base and its complexes were characterized by analytical (CHN elemental analyses, solubility, melting point, conductivity) measurements, spectral (IR, UV-vis, 1H and 13C-NMR and MS) and magnetometry. The elemental analyses, Uv-vis spectra and room temperature magnetic moment data provide evidence of six coordinated octahedral geometry for the complexes. The metal complexes’ low molar conductivity values in dimethylsulphoxide suggested that they were non-ionic in nature. The compounds displayed moderate to good antimicrobial and antifungal activities against S. aureus, P. aeruginosa, E. coli, B. cereus, P. mirabilis, K. oxytoca, A. niger, A. flevus and R. Stolonifer. The compounds also exhibited good antioxidant potentials with ferrous ion chelation and, 1-diphenyl-2-picryl-hydrazyl (DPPH) radical scavenging assays. Molecular docking studies showed a good interaction with drug targets used. The structural and electronic properties of complexes were further confirmed by density functional theory calculations.

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Du, Bo-Wei, Ching-Chang Lin, and Fu-Hsiang Ko. "Trivalent Cations Detection of Magnetic-Sensitive Microcapsules by Controlled-Release Fluorescence Off-On Sensor." Nanomaterials 11, no. 7 (July 10, 2021): 1801. http://dx.doi.org/10.3390/nano11071801.

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A pyrene-based derivative, 2-((pyrene-1-ylmethylene)amino)ethanol (PE) nanoparticle, was encapsulated via water-in-oil-in-water (W/O/W) double emulsion with the solvent evaporation method by one-pot reaction and utilized as a fluorescence turn-on sensor for detecting Fe3+, Cr3+, and Al3+ ions. Magnetic nanoparticles (MNPs) embedded in polycaprolactone (PCL) were used as the magnetic-sensitive polyelectrolyte microcapsule-triggered elements in the construction of the polymer matrix. The microcapsules were characterized by ultraviolet–visible (UV–Vis) and photoluminescence (PL) titrations, quantum yield (Φf) calculations, 1H nuclear magnetic resonance (NMR), scanning electron microscopy (SEM), and superconducting quantum interference device magnetometry (SQUID) studies. This novel responsive release of the microcapsule fluorescence of the turn-on sensor for detecting trivalent cations was due to the compound PE and the MNPs being incorporated well within the whole system, and an effective thermal and kinetic energy transfer between the core and shell structure efficiently occurred in the externally oscillating magnetic field. The magnetic-sensitive fluorescence turn-on microcapsules show potential for effective metal ion sensing in environmental monitoring and even biomedical applications. Under the optimal controlled-release probe fluorescence conditions with high-frequency magnetic field treatment, the limit of detection (LOD) reached 1.574–2.860 μM and recoveries ranged from 94.7–99.4% for those metals in tap water.

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Albadi, Yamen, Maria S. Ivanova, Leonid Y. Grunin, Kirill D. Martinson, Maria I. Chebanenko, Svetlana G. Izotova, Vladimir N. Nevedomskiy, Rufat S. Abiev, and Vadim I. Popkov. "The Influence of Co-Precipitation Technique on the Structure, Morphology and Dual-Modal Proton Relaxivity of GdFeO3 Nanoparticles." Inorganics 9, no. 5 (May 12, 2021): 39. http://dx.doi.org/10.3390/inorganics9050039.

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Nanocrystals of gadolinium orthoferrite (GdFeO3) with morphology close to isometric and superparamagnetic behavior were successfully synthesized using direct, reverse and microreactor co-precipitation of gadolinium and iron(III) hydroxides with their subsequent heat treatment in the air. The obtained samples were investigated by PXRD, FTIR, low-temperature nitrogen adsorption-desorption measurements, HRTEM, SAED, DRS and vibration magnetometry. According to the X-ray diffraction patterns, the GdFeO3 nanocrystals obtained using direct co-precipitation have the smallest average size, while the GdFeO3 nanocrystals obtained using reverse and microreactor co-precipitation have approximately the same average size. It was shown that the characteristic particle size values are much larger than the corresponding values of the average crystallite size, which indicates the aggregation of the obtained GdFeO3 nanocrystals. The GdFeO3 nanocrystals obtained using direct co-precipitation aggregate more than the GdFeO3 nanocrystals obtained using reverse co-precipitation, which, in turn, tend to aggregate more strongly than the GdFeO3 nanocrystals obtained using microreactor co-precipitation. The bandgap of the obtained GdFeO3 nanocrystals decreases with decreasing crystallite size, which is apparently due to their aggregation. The colloidal solutions of the obtained GdFeO3 nanocrystals with different concentrations were investigated by 1H NMR to measure the T1 and T2 relaxation times. Based on the obtained r2/r1 ratios, the GdFeO3 nanocrystals obtained using microreactor, direct and reverse co-precipitation may be classified as T1, T2 and T1–T2 dual-modal MRI contrast agents, respectively.

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Mrlík, Miroslav, Jozef Kollár, Katarína Borská, Markéta Ilčíková, Danila Gorgol, Josef Osicka, Michal Sedlačík, Alena Ronzová, Peter Kasák, and Jaroslav Mosnáček. "Atom Transfer Radical Polymerization of Pyrrole-Bearing Methacrylate for Production of Carbonyl Iron Particles with Conducting Shell for Enhanced Electromagnetic Shielding." International Journal of Molecular Sciences 23, no. 15 (August 1, 2022): 8540. http://dx.doi.org/10.3390/ijms23158540.

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The conducting polymer poly(2-(1H-pyrrole-1-yl)ethyl methacrylate (PPEMA) was synthesized by conventional atom transfer radical polymerization for the first time from free as well as surface-bonded alkyl bromide initiator. When grafted from the surface of carbonyl iron (CI) a substantial conducting shell on the magnetic core was obtained. Synthesis of the monomer as well as its polymer was confirmed using proton spectrum nuclear magnetic resonance (1H NMR). Polymers with various molar masses and low dispersity showed the variability of this approach, providing a system with a tailorable structure and brush-like morphology. Successful grafting from the CI surface was elucidate by transmission electron microscopy and Fourier-transform infrared spectroscopy. Very importantly, thanks to the targeted nanometer-scale shell thickness of the PPEMA coating, the magnetization properties of the particles were negligibly affected, as confirmed using vibration sample magnetometry. Smart elastomers (SE) consisting of bare CI or CI grafted with PPEMA chains (CI-PPEMA) and silicone elastomer were prepared and dynamic mechanical properties as well as interference shielding ones were investigated. It was found that short polymer chains grafted to the CI particles exhibited the plasticizing effect, which might be interesting from the magnetorheological point of view, and more interestingly, in comparison to the neat CI-based sample, it provided enhanced electromagnetic shielding of nearly 30 dB in thickness of 500 μm. Thus, SE containing the newly synthesized CI-PPEMA hybrid particles also exhibited considerably enhanced damping factor and proper mechanical performance, which make the material highly promising from various practical application points of view.

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Jacob, Adikwu Gowon, Roswanira Abdul Wahab, and Mailin Misson. "Operational Stability, Regenerability, and Thermodynamics Studies on Biogenic Silica/Magnetite/Graphene Oxide Nanocomposite-Activated Candida rugosa Lipase." Polymers 13, no. 21 (November 8, 2021): 3854. http://dx.doi.org/10.3390/polym13213854.

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Inorganic biopolymer-based nanocomposites are useful for stabilizing lipases for enhanced catalytic performance and easy separation. Herein, we report the operational stability, regenerability, and thermodynamics studies of the ternary biogenic silica/magnetite/graphene oxide nanocomposite (SiO2/Fe3O4/GO) as a support for Candida rugosa lipase (CRL). The X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), field-electron scanning electron microscopy (FESEM), vibrating sample magnetometry (VSM), and nitrogen adsorption/desorption data on the support and biocatalyst corroborated their successful fabrication. XPS revealed the Fe3O4 adopted Fe2+ and Fe3+ oxidation states, while XRD data of GO yielded a peak at 2θ = 11.67°, with the SiO2/Fe3O4/GO revealing a high surface area (≈261 m2/g). The fourier transform infrared (FTIR) spectra affirmed the successful fabricated supports and catalyst. The half-life and thermodynamic parameters of the superparamagnetic immobilized CRL (CRL/SiO2/Fe3O4/GO) improved over the free CRL. The microwave-regenerated CRL/SiO2/Fe3O4/GO (≈82%) exhibited higher catalytic activity than ultrasonic-regenerated (≈71%) ones. Lower activation (Ea) and higher deactivation energies (Ed) were also noted for the CRL/SiO2/Fe3O4/GO (13.87 kJ/mol, 32.32 kJ/mol) than free CRL (15.26 kJ/mol, 27.60 kJ/mol). A peak at 4.28 min in the gas chromatograph-flame ionization detection (GC-FID) chromatogram of the purified ethyl valerate supported the unique six types of 14 hydrogen atoms of the ester (CAS: 539-82-2) in the proton nuclear magnetic resonance (1H-NMR) data. The results collectively demonstrated the suitability of SiO2/Fe3O4/GO in stabilizing CRL for improved operational stability and thermodynamics and permitted biocatalyst regenerability.

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Medvedev, E. Yu, and Yu I. Deryabin. "An NMR magnetometer with frequency modulation." Instruments and Experimental Techniques 51, no. 6 (November 2008): 846–49. http://dx.doi.org/10.1134/s0020441208060122.

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Mu, Jiliang, Zhang Qu, Zongmin Ma, Shaowen Zhang, Yunbo Shi, Jian Gao, Xiaoming Zhang, et al. "Ensemble spin fabrication and manipulation of NV centres for magnetic sensing in diamond." Sensor Review 37, no. 4 (September 18, 2017): 419–24. http://dx.doi.org/10.1108/sr-09-2016-0163.

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Purpose This study aims to fabricate and manipulate ensemble spin of negative nitrogen-vacancy (NV−) centres optimally for future solid atomic magnetometers/gyroscope. Parameters for sample preparation most related to magnetometers/gyroscope are, in particular, the concentration and homogeneity of the NV− centres, the parameters’ microwave antenna of resonance frequency and the strength of the microwave on NV− centres. Besides, the abundance of other impurities such as neutral NV centres (NV0) and substitutional nitrogen in the lattice also plays a critical role in magnetic sensing. Design/methodology/approach The authors succeeded in fabricating the assembly of NV centres in diamond and they determined its concentration of (2-3) × 1016 cm−3 with irradiation followed by annealing under a high temperature condition. They explored a novel magnetic resonance approach to detect the weak magnetic fields that takes advantage of the solid-state electron ensemble spin of NV− centres in diamond. In particular, the authors set up a magnetic sensor on the basis of the assembly of NV centres. They succeeded in fabricating the assembly of NV centres in diamond and determined its concentration. They also clarified the magnetic field intensity measured at different positions along the antenna with different lengths, and they found the optimal position where the signal of the magnetic field reaches the maximum. Findings The authors mainly reported preparation, initialization, manipulation and measurement of the ensemble spin of the NV centres in diamond using optical excitation and microwave radiation methods with variation of the external magnetic field. They determined the optimal parameters of irradiation and annealing to generate the ensemble NV centres, and a concentration of NV− centres as high as 1016 cm−3 in diamond was obtained. In addition, they found that sensitivity of the magnetometer using this method can reach as low as 5.22 µT/Hz currently. Practical implications This research can shed light on the development of an atomic magnetometer and a gyroscope on the basis of the ensemble spin of NV centres in diamond. Social implications High concentration spin of NV− in diamond is one of the advantages compared with that of the atomic vapor cells, because it can obtain a higher concentration. When increasing the spin concentration, the spin signal is easy to detect, and macro-atomic spin magnetometer become possible. This research is the first step for solid atomic magnetometers with high spin density and high sensitivity potentially with further optimization. It has a wide range of applications from fundamental physics tests, sensor applications and navigation to detection of NMR signals. Originality/value As has been pointed out, in this research, the authors mainly worked on fabricating NV− centres with high concentration (1015-1016 cm−3) in diamond by using optimal irradiation and annealing processes, and they quantitatively defined the NV− concentration, which is important for the design of higher concentration processes in the magnetometer and gyroscope. Until now, few groups can directly define the NV− concentration. Besides, the authors optimized the microwave antenna parameters experimentally and explored the dependence between the splitting of the magnetic resonance and the magnetic fields, which dictated the minimum detectable magnetic field.

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Kernevez, N., D. Duret, M. Moussavi, and J. M. Leger. "Weak field NMR and ESR spectrometers and magnetometers." IEEE Transactions on Magnetics 28, no. 5 (September 1992): 3054–59. http://dx.doi.org/10.1109/20.179715.

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Davydov, V. V., V. I. Dudkin, A. A. Petrov, and N. S. Myazin. "On the sensitivity of running-fluid NMR magnetometers." Technical Physics Letters 42, no. 7 (July 2016): 692–96. http://dx.doi.org/10.1134/s1063785016070051.

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Prigl, R., U. Haeberlen, K. Jungmann, G. zu Putlitz, and P. von Walter. "A high precision magnetometer based on pulsed NMR." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 374, no. 1 (May 1996): 118–26. http://dx.doi.org/10.1016/0168-9002(96)37493-7.

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Luo, Wenhao, Hong Zhang, Yan Liu, Xiaogang Wei, Xiaonan Zhang, Yanhua Wang, and Renfu Yang. "A dual-axis high-order harmonic and single-axis phase-insensitive demodulation atomic magnetometer for in situ NMR detection of Xe." Journal of Applied Physics 132, no. 14 (October 14, 2022): 144401. http://dx.doi.org/10.1063/5.0096583.

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Based on the parametric oscillation process, we demonstrate the dual-axis phase-sensitive demodulation (PSD) and single-axis phase-insensitive demodulation (PISD) for the atomic magnetometer in an in situ nuclear magnetic resonance (NMR) detection system, which can separate the precession signals of NMR from the oscillating magnetic fields. The two orthogonal magnetic fields can be detected simultaneously and independently by selecting the optimal demodulation phases with the traditional PSD method. The response signals of the parametric modulation magnetometer demodulated with high order harmonic signals are evaluated, which is a new exploration. The first order harmonic demodulation can present the best sensitivity about 250 fT/Hz1/2. The high order harmonic demodulation technology supplies a twofold 3 dB bandwidth. With the PISD method, a single-axis demodulation technique is proposed. The transverse nuclear spin precession magnetic fields can be extracted effectively with the demodulation R signal outputs by setting a specific longitudinal modulation magnetic field amplitude, which is a new demodulation strategy compared with the traditional demodulation method for the NMR system.

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Thomasson, S. L., and C. M. Gould. "Direct coupled dc SQUID magnetometer for ultralow temperature NMR." Czechoslovak Journal of Physics 46, S5 (May 1996): 2849–50. http://dx.doi.org/10.1007/bf02570411.

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Savukov, I. M., S. J. Seltzer, and M. V. Romalis. "Detection of NMR signals with a radio-frequency atomic magnetometer." Journal of Magnetic Resonance 185, no. 2 (April 2007): 214–20. http://dx.doi.org/10.1016/j.jmr.2006.12.012.

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Bevilacqua, Giuseppe, Valerio Biancalana, Andrei Ben-Amar Baranga, Yordanka Dancheva, and Claudio Rossi. "Microtesla NMR J-coupling spectroscopy with an unshielded atomic magnetometer." Journal of Magnetic Resonance 263 (February 2016): 65–70. http://dx.doi.org/10.1016/j.jmr.2015.12.018.

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37

Kernevez, N., and H. Glenat. "Description of a high sensitivity CW scalar DNP-NMR magnetometer." IEEE Transactions on Magnetics 27, no. 6 (November 1991): 5402–4. http://dx.doi.org/10.1109/20.278852.

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38

Klinser, Gregor, Heinz Krenn, and Roland Würschum. "Operando Monitoring of Charging Processes in Battery Cathodes by Magnetometry and Positron Annihilation." Materials Science Forum 1016 (January 2021): 1647–52. http://dx.doi.org/10.4028/www.scientific.net/msf.1016.1647.

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Research in the field of modern battery materials demands characterization techniques which allow an inspection of atomistic processes during battery charging and discharging. Two powerful tools for this purpose are magnetometry and positron-electron annihilation. The magnetic moment serves as highly sensitive fingerprint for the oxidation state of the transition metal ions, thus enabling to identify the electrochemical ”active” ions. The positron lifetime on the other hand, is sensitive to open volume defects of the size of a few missing atoms down to single vacancies providing an unique insight into lattice defects induced by charging and discharging. An overview will be given on operando magnetometry studies of the important class of LiNiCoMn-oxide cathode materials (so-called NMC with Ni:Co:Mn ratios of 1:1:1 and 3:1:1) as well as of sodium vanadium phosphate cathodes. First operando positron annihilation studies on a battery cathode material (NMC 1:1:1) demonstrate the capability of this technique for battery research.

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Zhang, Yang, Jintao Zheng, Zaiyang Yu, Zhiqiang Xiong, Zhiguo Wang, and Hui Luo. "Measurement of longitudinal nuclear spin relaxation time in NMR gyroscope by real-time monitoring." AIP Advances 12, no. 9 (September 1, 2022): 095221. http://dx.doi.org/10.1063/5.0106483.

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In the atomic cell of a nuclear magnetic resonance gyroscope, a transverse bias field is applied to enable the in situ alkali magnetometer to sense the variations in the longitudinal magnetic field. During a single relaxation process of the noble gas, the longitudinal relaxation time is obtained by monitoring and fitting the signal of the magnetometer in real-time. The relaxation times measured using our method are nearly identical to those obtained using the conventional delayed pulse method, but in contrast, our method saves ∼90% of the time. By using the new method, fast and accurate batch testing for a large number of atomic cells can be achieved to optimize the manufacturing of the cells, which is helpful in speeding up the development of gyroscopes.

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Beguš, S., and D. Fefer. "An absorption-type proton NMR magnetometer for measuring low magnetic fields." Measurement Science and Technology 18, no. 3 (February 13, 2007): 901–6. http://dx.doi.org/10.1088/0957-0233/18/3/045.

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Liu, Guobin, Xiaofeng Li, Xianping Sun, Jiwen Feng, Chaohui Ye, and Xin Zhou. "Ultralow field NMR spectrometer with an atomic magnetometer near room temperature." Journal of Magnetic Resonance 237 (December 2013): 158–63. http://dx.doi.org/10.1016/j.jmr.2013.10.008.

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42

Ledbetter, M. P., I. M. Savukov, D. Budker, V. Shah, S. Knappe, J. Kitching, D. J. Michalak, S. Xu, and A. Pines. "Zero-field remote detection of NMR with a microfabricated atomic magnetometer." Proceedings of the National Academy of Sciences 105, no. 7 (February 6, 2008): 2286–90. http://dx.doi.org/10.1073/pnas.0711505105.

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Walbrecker, Jan O., Marian Hertrich, and Alan G. Green. "Off-resonance effects in surface nuclear magnetic resonance." GEOPHYSICS 76, no. 2 (March 2011): G1—G12. http://dx.doi.org/10.1190/1.3535414.

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Surface nuclear magnetic resonance (NMR) is a noninvasive geophysical tool used to investigate groundwater reservoirs. The relevant physical process in surface NMR is the nuclear spin of hydrogen protons in liquid water. Standard single-pulse surface NMR experiments provide estimates of water content in the shallow subsurface. Under favorable conditions, pore-structure and even hydraulic-conductivity information can be extracted from double-pulse surface NMR data. One crucial issue in surface NMR experiments is the resonance condition: the frequency of the excitation field should closely match the Larmor frequency of the protons, which is controlled by the local magnitude of the earth’s magnetic field. Although the earth’s field can be measured accurately by an on-site magnetometer, several effects impede perfect matching of the frequencies. These include temporal variations of the earth’s field, instrumental imperfections, and the magnetic susceptibility of the underlying rocks. We assess the impact of violating the resonance condition on surface NMR experiments. Our investigation involves numerical simulations and measurements using a sample-scale earth-field NMR device and a surface NMR acquisition system. For frequency offsets up to 5 Hz, we find that relatively standard single-pulse surface NMR recording procedures are likely to produce reliable water-content estimates as long as the pulse moments are small to moderate or the aquifer is relatively deep. If strong pulse moments are required or shallow aquifers are probed, off-resonance conditions can lead to anomalous increases in recorded amplitudes that can be mistakenly interpreted in terms of deepwater occurrences. Double-pulse surface NMR experiments are particularly sensitive to off-resonance effects, such that the results may be highly biased even for the small-frequency offsets commonly encountered in field situations.

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Thomasson, S. L., and C. M. Gould. "High slew rate large bandwidth integrated dc SQUID magnetometer for NMR applications." IEEE Transactions on Appiled Superconductivity 5, no. 2 (June 1995): 3222–25. http://dx.doi.org/10.1109/77.403277.

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Ganssle, Paul J., Hyun D. Shin, Scott J. Seltzer, Vikram S. Bajaj, Micah P. Ledbetter, Dmitry Budker, Svenja Knappe, John Kitching, and Alexander Pines. "Ultra-Low-Field NMR Relaxation and Diffusion Measurements Using an Optical Magnetometer." Angewandte Chemie 126, no. 37 (July 31, 2014): 9924–28. http://dx.doi.org/10.1002/ange.201403416.

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Ganssle, Paul J., Hyun D. Shin, Scott J. Seltzer, Vikram S. Bajaj, Micah P. Ledbetter, Dmitry Budker, Svenja Knappe, John Kitching, and Alexander Pines. "Ultra-Low-Field NMR Relaxation and Diffusion Measurements Using an Optical Magnetometer." Angewandte Chemie International Edition 53, no. 37 (July 31, 2014): 9766–70. http://dx.doi.org/10.1002/anie.201403416.

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Lejda, Katarzyna, Mariusz Drygaś, Jerzy F. Janik, Jacek Szczytko, Andrzej Twardowski, and Zbigniew Olejniczak. "Magnetism of Kesterite Cu2ZnSnS4 Semiconductor Nanopowders Prepared by Mechanochemically Assisted Synthesis Method." Materials 13, no. 16 (August 7, 2020): 3487. http://dx.doi.org/10.3390/ma13163487.

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High energy ball milling is used to make first the quaternary sulfide Cu2ZnSnS4 raw nanopowders from two different precursor systems. The mechanochemical reactions in this step afford cubic pre-kesterite with defunct semiconducting properties and showing no solid-state 65Cu and 119Sn MAS NMR spectra. In the second step, each of the milled raw materials is annealed at 500 and 550 °C under argon to result in tetragonal kesterite nanopowders with the anticipated UV-Vis-determined energy band gap and qualitatively correct NMR characteristics. The magnetic properties of all materials are measured with SQUID magnetometer and confirm the pre-kesterite samples to show typical paramagnetism with a weak ferromagnetic component whereas all the kesterite samples to exhibit only paramagnetism of relatively decreased magnitude. Upon conditioning in ambient air for 3 months, a pronounced increase of paramagnetism is observed in all materials. Correlations between the magnetic and spectroscopic properties of the nanopowders including impact of oxidation are discussed. The magnetic measurements coupled with NMR spectroscopy appear to be indispensable for comprehensive kesterite evaluation.

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Nelly, Kernevez, and Glenat Henri. "5414357 NMR magnetometer probe having a single resonator and a single radical solution." Magnetic Resonance Imaging 13, no. 7 (January 1995): III. http://dx.doi.org/10.1016/0730-725x(95)99141-j.

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Yang, S. Y., K. W. Lin, J. J. Chieh, C. C. Yang, H. E. Horng, S. H. Liao, H. H. Chen, C. Y. Hong, and H. C. Yang. "Step-Edge High-${\rm T}_{\rm c}$ SQUID Magnetometer for Low-Field NMR Detection." IEEE Transactions on Applied Superconductivity 21, no. 3 (June 2011): 534–37. http://dx.doi.org/10.1109/tasc.2011.2104353.

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Lang, K., M. Moussavi, and E. Belorizky. "New, High-Performance, Hydrogenated Paramagnetic Solution for Use in Earth Field DNP-NMR Magnetometers." Journal of Physical Chemistry A 101, no. 9 (February 1997): 1662–71. http://dx.doi.org/10.1021/jp962283g.

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Journal articles on the topic 'NMR magnetometry'

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