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Автор: Grafiati

Опубліковано: 6 вересня 2023

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1

Elsayed, Elsayed M., Hazem F. Khalil, Ibrahim A. Ibrahim, Mostafa R. Hussein, and Mohamed M. B. El-Sabbah. "The Significance of Buffer Solutions on Corrosion Processes of Cobalt Ferrite CoFe2O4 Thin Film on Different Substrates." Combinatorial Chemistry & High Throughput Screening 23, no. 7 (October 5, 2020): 599–610. http://dx.doi.org/10.2174/1386207323666191217130209.

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Background: The spinel ferrite nanoparticles, such as zinc, nickel, and cobalt ferrites have exceptional electronic and magnetic properties. Cobalt ferrite nanomaterial (CoFe2O4) is a hard material that reveals high magnetic, mechanical, and chemical stability. Aim and Objective: The objective of this research is to predict the corrosion behavior of cobalt ferrite (CoFe2O4) thin films deposited on different substrates (platinum Pt, stainless steel S.S, and copper Cu) in acidic, neutral, and alkaline medium. Materials and Method: Cobalt ferrite thin films were deposited on platinum, stainless steel, and copper via electrodeposition-anodization process. After that, corrosion resistance of the prepared nanocrystalline cobalt ferrite on different substrates was investigated in acidic, neutral, and alkaline medium using open circuit potential and potentiodynamic polarization measurements. The crystal structure, crystallite size, microstructure, and magnetic properties of the ferrite films were investigated using a combination of XRD, SEM and VSM. Results: The results of XRD revealed a cubic spinel for the prepared cobalt ferrite CoFe2O4. The average size of crystallites was found to be about 43, 77, and 102 nm precipitated on platinum, stainless steel, and copper respectively. The magnetic properties of which were enhanced by rising the temperature. The sample annealed at 800oC is suitable for practical application as it showed high magnetization saturation and low coercivity. The corrosion resistance of these films depends on the pH of the medium as well as the presence of oxidizing agent. Conclusion: Depending on the obtained corrosion rate, we can recommend that, CoFe2O4 thin film can be used safely in aqueous media in neutral and alkaline atmospheres for Pt and Cu substrates, but it can be used in all pH values for S.S. substrate.

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2

Basantakumar Sharma, H. "Multiferroic bismuth ferrite thin film and bismuth ferrite-cobalt ferrite nanocomposites." Ferroelectrics 516, no. 1 (August 18, 2017): 90–97. http://dx.doi.org/10.1080/00150193.2017.1362289.

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3

Barbosa, J. G., Bernardo G. Almeida, João P. Araújo, João Bessa Sousa, and Jorge A. Mendes. "Structural and Magnetic Properties of Nanogranular BaTiO₃-CoFe₂O₄ Thin Films Deposited by Laser Ablation on Si/Pt Substrates." Materials Science Forum 587-588 (June 2008): 303–7. http://dx.doi.org/10.4028/www.scientific.net/msf.587-588.303.

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Thin film nanocomposites of cobalt ferrite (CoFe2O4) dispersed in barium titanate (BaTiO3) matrix, have been deposited with different cobalt ferrite concentrations (from 20% to 70% CoFe2O4), as well as pure barium titanate and cobalt ferrite thin films (end members). The films were prepared by pulsed laser ablation on platinum covered Si(001) substrates. The films structure was studied by X-ray diffraction and their surface was examined by scanning electron microscopy (SEM). The magnetic properties were measured in a SQUID magnetometer. The results show that the deposited films are polycrystalline with a slight (111) barium titanate phase orientation and (311) CoFe2O4 phase orientation. The grain sizes measured from the X-ray diffraction peak widths, for both phases, are in the range 40nm to 100nm. However, as the concentration of the cobalt ferrite increases, the grain size of the BaTiO3 phase decreases, from 100nm to 30nm, up to 40% CoFe2O4 concentration beyond which the BaTiO3 grain size has an approximately constant value near 30nm. On the other hand the cobalt ferrite grain size does not show a clear trend with increasing cobalt ferrite concentration, fluctuating in the range 20nm to 30nm. The magnetic measurements show an increase of the magnetic moment from the low concentration region where the magnetic grains are more isolated and their magnetic interaction is small, towards the bulk value at higher CoFe2O4 concentrations. Also, a strong reduction of the magnetization with increasing temperature was observed, due to the corresponding decrease of the magnetocristalline anisotropy of the cobalt ferrite.

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4

Thien, Jannis, Jascha Bahlmann, Andreas Alexander, Kevin Ruwisch, Jari Rodewald, Tobias Pohlmann, Martin Hoppe, et al. "Cationic Ordering and Its Influence on the Magnetic Properties of Co-Rich Cobalt Ferrite Thin Films Prepared by Reactive Solid Phase Epitaxy on Nb-Doped SrTiO3(001)." Materials 15, no. 1 (December 22, 2021): 46. http://dx.doi.org/10.3390/ma15010046.

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Here, we present the (element-specific) magnetic properties and cation ordering for ultrathin Co-rich cobalt ferrite films. Two Co-rich CoxFe3−xO4 films with different stoichiometry (x=1.1 and x=1.4) have been formed by reactive solid phase epitaxy due to post-deposition annealing from epitaxial CoO/Fe3O4 bilayers deposited before on Nb-doped SrTiO3(001). The electronic structure, stoichiometry and homogeneity of the cation distribution of the resulting cobalt ferrite films were verified by angle-resolved hard X-ray photoelectron spectroscopy. From X-ray magnetic circular dichroism measurements, the occupancies of the different sublattices were determined using charge-transfer multiplet calculations. For both ferrite films, a partially inverse spinel structure is found with increased amount of Co3+ cations in the low-spin state on octahedral sites for the Co1.4Fe1.6O4 film. These findings concur with the results obtained by superconducting quantum interference device measurements. Further, the latter measurements revealed the presence of an additional soft magnetic phase probably due to cobalt ferrite islands emerging from the surface, as suggested by atomic force microscope measurements.

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5

Sharma, Deepanshu, Neeraj Khare, and Mahesh P. Abegaonkar. "Magnetically tunable bandpass filter using cobalt ferrite thin film." Solid State Communications 230 (March 2016): 40–42. http://dx.doi.org/10.1016/j.ssc.2016.01.014.

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6

Soe, Thiha, Arthit Jityen, Teerakorn Kongkaew, Kittitat Subannajui, Asawin Sinsarp, and Tanakorn Osotchan. "Atomic structure of cobalt doped copper ferrite thin film." Materials Today: Proceedings 23 (2020): 752–56. http://dx.doi.org/10.1016/j.matpr.2019.12.269.

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7

Martens, J. W. D., and W. L. Peeters. "Anisotropy in Cobalt-Ferrite thin films." Journal of Magnetism and Magnetic Materials 61, no. 1-2 (September 1986): 21–23. http://dx.doi.org/10.1016/0304-8853(86)90062-4.

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8

Joshi, Chhatra R., Mahendra Acharya, Md Sariful Sheikh, John Plombon, and Arunava Gupta. "Effect of cobalt substitution on the structural, ferroelectric, and magnetic properties of bismuth ferrite thin films." Journal of Applied Physics 132, no. 19 (November 21, 2022): 194102. http://dx.doi.org/10.1063/5.0116794.

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Epitaxial films of multiferroic BiFe[Formula: see text]Co[Formula: see text]O[Formula: see text] (BFCO) with [Formula: see text] are grown on (001)-oriented SrTiO[Formula: see text] and SrRuO[Formula: see text] buffered SrTiO[Formula: see text] substrates using the pulsed laser deposition technique. The effect of structural transformation from rhombohedral to tetragonal phase with increasing cobalt substitution on the magnetic, electrical, and piezo-/ferroelectric properties is investigated. Piezoresponse force microscopy is used to quantify the coercive voltage from the phase hysteresis loops for different thickness films to investigate the semi-empirical Kay–Dunn scaling law with varying cobalt concentrations. For the rhombohedral structure, a reduction of the coercive voltage is observed with increasing substitution of Fe by Co. The coercive voltage of a 10 nm BFCO ([Formula: see text]) film is found to be 0.63 V, which is 67% lower than that of a pure BiFeO[Formula: see text] (BFO) (1.9 V) film of the same thickness. Cobalt substitution also leads to changes in the magnetic and electrical properties due to modification of spin ordering and reduction of the bandgap, respectively. Further, to validate the experimental results, we have performed theoretical calculations using density functional theory. The theoretical results indicate a reduction in unit cell volume and enhancement in net magnetization can be achieved with cobalt substitution, in agreement with experimental results. Partial Co substitution can, thus, provide a pathway to realize BFO-based nonvolatile magnetoelectric devices with reduced operating voltage.

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9

Ramli, Ramli, Riri Jonuarti, and Ambran Hartono. "ANALISIS STRUKTUR NANO DARI LAPISAN TIPIS COBALT FERRITE YANG DIPREPARASI DENGAN METODE SPUTTERING." EKSAKTA: Berkala Ilmiah Bidang MIPA 18, no. 01 (April 28, 2017): 46–53. http://dx.doi.org/10.24036/eksakta/vol18-iss01/16.

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In this paper we report the results of studies relating to the synthesis of Cobalt Ferrite (CoFe2O4) thin films by a sputtering method. The CoFe2O4 thin film has been prepared onto silicon substrate from the sputtering targets, CoFe. Structural propertiesofthinfilms were characterized byx-ray diffraction and the morphology was characterized by scanning electron microscopy. The growth parameter are: base pressure 2,8 x 10-2 Torr, ratio of Argon:Oxygen flow rate are 100:50 sccm, deposition pressure 5.4 x10-1 Torr, growth temperature 100oC.Nanostructures of the thin film that have been analyzed are crystallite size and micro strain.We obtained the crystallite size of CoFe2O4 thin films for layer thickness of 40 and 48 nm, respectively are: 32 nm and 66 nm, while the micro strain is 8.0 x 10-4 and 10.2 x 10-4.

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10

Prasad, Rishu, and S. K. S. S Parashar. "Structural and electromagnetic properties of nano cobalt ferrite polymeric thin film." Journal of Materials Science: Materials in Electronics 30, no. 13 (May 28, 2019): 12023–30. http://dx.doi.org/10.1007/s10854-019-01559-8.

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11

Rao, Wei, Yun Bo Wang, Ye An Wang, Jun Xiong Gao, Wen Li Zhou, and Jun Yu. "Surface Morphology and Magnetic Properties of CoFe₂O₄ Thin Films Prepared via Sol–Gel Method." Advanced Materials Research 750-752 (August 2013): 1024–28. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.1024.

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The thin films of CoFe2O4spinel ferrite were prepared on the substrates of monocrystalline silicon(100) at low temperature by means of a developed citrate processing.Structural properties and surface morphology of deposited films were examined using an X-ray diffractometer (XRD) and a field emission scanning electron microscope (FESEM). XRD patterns of all deposited films consisted of a single phase of cobalt ferrite and they did not have any preferred orientation. FESEM micrographs of CoFe2O4films showed that the film calcined at 400°C had a surface morphology different from the ones at 700°C and 800°C. The surface morphology of the samples was very different with various alcined temperatures. Magnetic properties measured at room temperature showed that the films did not have any magnetically preferred orientation. The maximum values of the coercivities measured at perpendicular and in-plane directions were 3.873 and 2.70 kOe, respectively.

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12

Dugger, M. T., Y. W. Chung, B. Bhushan, and W. Rothschild. "Friction, Wear, and Interfacial Chemistry in Thin Film Magnetic Rigid Disk Files." Journal of Tribology 112, no. 2 (April 1, 1990): 238–45. http://dx.doi.org/10.1115/1.2920247.

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We present results of a study of hemispherical pins of manganese-zinc ferrite sliding against rigid disks composed of thin films of a sputtered cobalt-nickel-platinum alloy and carbon, with perfluoropolyether as the topical lubricant. The contact life, as marked by the total distance slid to the point at which the coefficient of friction increases rapidly over the steady state value, is much longer in air with 50 percent relative humidity than in dry air or vacuum. The wear debris generated in humid air is much finer and is enriched with cobalt on its surface. In dry air and vacuum, the debris is substantially larger than one micron and tends to be enriched with nickel on its surface. We present a hypothesis which explains the wear mechanisms in various operating environments.

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13

Sahoo, S. C., N. Venkataramani, Shiva Prasad, Murtaza Bohra, and R. Krishnan. "Pulse Laser Deposited Nanocrystalline Cobalt Ferrite Thin Films." Journal of Nanoscience and Nanotechnology 10, no. 5 (May 1, 2010): 3112–17. http://dx.doi.org/10.1166/jnn.2010.2173.

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14

Suzuki, Y., G. Hu, R. B. van Dover, and R. J. Cava. "Magnetic anisotropy of epitaxial cobalt ferrite thin films." Journal of Magnetism and Magnetic Materials 191, no. 1-2 (January 1999): 1–8. http://dx.doi.org/10.1016/s0304-8853(98)00364-3.

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15

YAMAMOTO, S., T. ANDOU, H. KURISU, M. MATSUURA, T. DOI, and K. TAMARI. "Cobalt Ferrite Thin Film Hard Disk for High-Density Perpendicular Magnetic Recording." Journal of the Magnetics Society of Japan 22, S_1_ISFA_97 (1998): S1_113–116. http://dx.doi.org/10.3379/jmsjmag.22.s1_113.

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16

Onoda, H., H. Sukegawa, E. Kita, and H. Yanagihara. "Control of Magnetic Anisotropy by Lattice Distortion in Cobalt Ferrite Thin Film." IEEE Transactions on Magnetics 54, no. 11 (November 2018): 1–4. http://dx.doi.org/10.1109/tmag.2018.2833880.

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17

Sapkota, Bedanga, Md Tanvir Hasan, Alix Martin, Rifat Mahbub, Jeffrey E. Shield, and Vijaya Rangari. "Fabrication and magnetoelectric investigation of flexible PVDF-TrFE/cobalt ferrite nanocomposite films." Materials Research Express 9, no. 4 (April 1, 2022): 046302. http://dx.doi.org/10.1088/2053-1591/ac6151.

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Abstract Flexible nanocomposite films, with cobalt ferrite nanoparticles (CFN) as the ferromagnetic component and polyvinylidene fluoride–trifluoroethylene (PVDF-TrFE) copolymer as the ferroelectric matrix, were fabricated using a blade coating technique. Nanocomposite films were prepared using a two-step process; the first process involves the synthesis of cobalt ferrite (CoFe2O4) nanoparticles using a sonochemical method, and then incorporation of various weight percentages (0, 2.5, 5, and 10%) of cobalt ferrite nanoparticles into the PVDF-TrFE to form nanocomposites. The ferroelectric polar β phase of PVDF-TrFE was confirmed by x-ray diffraction (XRD). Thermal studies of films showed notable improvement in the thermal properties of the nanocomposite films with the incorporation of nanoparticles. The ferroelectric properties of the pure polymer/composite films were studied, showing a significant improvement of maximum polarization upon 5wt% CFN loading in PVDF-TrFE composite films compared to the PVDF-TrFE film. The magnetic properties of as-synthesized CFN and the polymer nanocomposites were studied, showing a magnetic saturation of 53.7 emu g−1 at room temperature, while 10% cobalt ferrite-(PVDF-TrFE) nanocomposite shows 27.6 emu/g. We also describe a process for fabricating high optical quality pure PVDF-TrFE and pinhole-free nanocomposite films. Finally, the mechanical studies revealed that the mechanical strength of the films increases up to 5 wt% loading of the nanoparticles in the copolymer matrix and then decreases. This signifies that the obtained films could be suited for flexible electronics.

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18

Aditya, Lakshmikanta, A. Srivastava, S. K. Sahoo, P. Das, C. Mukherjee, Abha Misra, V. R. Reddy, et al. "Growth of Textured Nanocrystalline Cobalt Ferrite Thin Films by Pulsed Laser Deposition." Journal of Nanoscience and Nanotechnology 8, no. 8 (August 1, 2008): 4135–40. http://dx.doi.org/10.1166/jnn.2008.an46.

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Cobalt ferrite thin films have been deposited on fused quartz substrates by pulsed laser deposition at various substrate temperatures, TS (25 °C, 300 °C, 550 °C and 750 °C). Single phase, nanocrystalline, spinel cobalt ferrite formation is confirmed by X-ray diffraction (XRD) for TS ≥ 300 °C. Conventional XRD studies reveal strong (111) texturing in the as deposited films with TS ≥ 550 °C. Bulk texture measurements using X-ray orientation distribution function confirmed (111) preferred orientation in the films with TS ≥ 550 °C. Grain size (13–16 nm for TS ≥ 300 °C) estimation using grazing incidence X-ray line broadening analysis shows insignificant grain growth with increasing TS, which is in good agreement with grain size data obtained from transmission electron microscopy.

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19

Nikam, S. M., A. Sharma, M. Rahaman, A. M. Teli, S. H. Mujawar, D. R. T. Zahn, P. S. Patil, S. C. Sahoo, G. Salvan, and P. B. Patil. "Pulsed laser deposited CoFe2O4 thin films as supercapacitor electrodes." RSC Advances 10, no. 33 (2020): 19353–59. http://dx.doi.org/10.1039/d0ra02564j.

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Cobalt ferrite thin films were grown by PLD at different temperatures as an electrode material for supercapacitors. The films deposited at room temperature exhibited the best power density (3277 W kg⁻¹) and energy density (17 W h kg⁻¹) values.

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20

Kharat, Balasaheb, Vikas Magar, Sagar Rathod, A. A. Chaudhari, and V. B. Malode. "Studies on Structural, Infrared and Optical Properties of Cobalt Ferrite Thin Film Grown by Spray Pyrolysis Technique." Advanced Materials Research 1169 (March 18, 2022): 43–48. http://dx.doi.org/10.4028/p-f41120.

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Thin film of cobalt ferrite has been deposited on glass substrate by a chemical spray pyrolysis technique using methanol solutions at 400◦C substrate temperature. The uniformly deposited thin film were annealed at 500 ◦C and studied their structural, infrared and optical properties using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and UV-Vis spectroscopy (UV-Vis), respectively. The X-ray diffraction patterns revealed single phase cubic spinel structure with space group Fd-3m. The fundamental absorption bands related to octahedral and tetrahedral sites were confirmed by Fourier-transform infrared spectroscopy (FTIR) spectrum.The formation of cubic spinel crystal structure of the CoFe2O4 thin filmwere confirmed from exhibited strong absorption peaks around 530.21 and 451.48 cm−1 by FT-IR spectra.The optical properties of the deposited thin film were studied by an absorbance spectrum found at 315 nm. The value of energy bandgap (2.4 eV) wasinvestigated by Tauc plot.The obtained results indicate the fabricated thin film is promising material for various applications.

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21

Cheng, Sheng, Lvkang Shen, Shaodong Cheng, Chunrui Ma, Ming Liu, and Tao Zhu. "Polarized neutron reflectometry study on the modulation of resistance and magnetism in resistive switching cobalt ferrite thin films." Applied Physics Letters 121, no. 21 (November 21, 2022): 211602. http://dx.doi.org/10.1063/5.0122216.

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In this work, the resistive switching and electrical-control of magnetization in Pt/CoFe2O4/Nb:SrTiO3 heterostructures have been investigated. The films exhibit a classic bipolar resistive switching effect with a maximum switch ratio of about 5 × 103 and good anti-fatigue performance. Associated with resistive switching, the saturated magnetization of the thin film at high resistance state is found to be larger than that at low resistance state. Meanwhile, polarized neutron reflectivity of the thin film under different resistance states was in situ measured. The results reveal that the interfacial migration of oxygen vacancies driven by an applied electric field plays an important role in the modulation of resistive and magnetism of CoFe2O4 resistive switching devices.

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22

Sahoo, Subasa C., N. Venkataramani, Shiva Prasad, Murtaza Bohra, and R. Krishnan. "Thickness dependent anomalous magnetic behavior in pulsed-laser deposited cobalt ferrite thin film." Applied Physics A 106, no. 4 (December 16, 2011): 931–35. http://dx.doi.org/10.1007/s00339-011-6709-1.

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23

Муслимов, А. Э., А. В. Буташин та В. М. Каневский. "Влияние напряжений на магнитные свойства пленок NiFe-=SUB=-2-=/SUB=-O-=SUB=-4-=/SUB=- и CoFe-=SUB=-2-=/SUB=-O-=SUB=-4-=/SUB=- на сапфире". Письма в журнал технической физики 44, № 16 (2018): 57. http://dx.doi.org/10.21883/pjtf.2018.16.46477.17370.

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AbstractWe have studied the influence of mechanical stresses on the magnetic properties of nickel ferrite (NiFev) and cobalt ferrite (CoFe_2O_4) films deposited on sapphire substrates with a - and c -oriented step terrace nanostructures. It is established that compressive stresses favor enhancement of the coercive field in thin ferrite films in the strain direction. Films of magnetically soft nickel ferrite with a room-temperature coercive field of 32.5 mT were obtained.

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24

Robbennolt, Shauna, Pengmei Yu, Aliona Nicolenco, Pau Mercier Fernandez, Mariona Coll, and Jordi Sort. "Magneto-ionic control of magnetism in two-oxide nanocomposite thin films comprising mesoporous cobalt ferrite conformally nanocoated with HfO2." Nanoscale 12, no. 10 (2020): 5987–94. http://dx.doi.org/10.1039/c9nr10868h.

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25

Hammadi, Oday A. "Production of nanopowders from physical vapor deposited films on nonmetallic substrates by conjunctional freezing-assisted ultrasonic extraction method." Proceedings of the Institution of Mechanical Engineers, Part N: Journal of Nanomaterials, Nanoengineering and Nanosystems 232, no. 4 (November 4, 2018): 135–40. http://dx.doi.org/10.1177/2397791418807347.

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A new technique to extract nanoscale powders from thin films deposited by a physical vapor deposition method on nonmetallic substrates is proposed. Powders were extracted from films of different materials, such as silicon, nickel, copper, iron, aluminum and cobalt, and compounds, such as aluminum nitride, aluminum oxide, copper oxide, iron oxide, nickel cobaltite, nickel ferrite, nickel oxide, silicon carbide, silicon nitride and silicon oxide. These thin films were deposited on glass substrates by magnetron sputtering, pulsed-laser deposition, spray pyrolysis or thermal evaporation, and the particle sizes of the extracted powders were comparable to those of film samples. This technique is fast, low cost, reliable, highly clean and appropriate for large-scale samples.

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26

Hiratsuka, Nobuyuki, Tetsuo Kadoshima, Minoru Fujita, and Mitsuo Sugimoto. "Magneto-optical Properties of Cobalt Ferrite Sputtered Thin Films." Journal of the Japan Society of Powder and Powder Metallurgy 39, no. 11 (1992): 989–92. http://dx.doi.org/10.2497/jjspm.39.989.

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27

Hu, G., V. G. Harris, and Y. Suzuki. "Microstructure and magnetic properties of cobalt ferrite thin films." IEEE Transactions on Magnetics 37, no. 4 (July 2001): 2347–49. http://dx.doi.org/10.1109/20.951168.

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28

Dascalu, Georgiana, Dan Durneata, and Ovidiu Florin Caltun. "Magnetic Measurements of RE-Doped Cobalt Ferrite Thin Films." IEEE Transactions on Magnetics 49, no. 1 (January 2013): 46–49. http://dx.doi.org/10.1109/tmag.2012.2220534.

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29

Dascalu, Georgiana, Gloria Pompilian, Bertrand Chazallon, Ovidiu Florin Caltun, Silviu Gurlui, and Cristian Focsa. "Femtosecond pulsed laser deposition of cobalt ferrite thin films." Applied Surface Science 278 (August 2013): 38–42. http://dx.doi.org/10.1016/j.apsusc.2013.02.107.

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30

Yoshihara, Shintaro, and Hideto Yanagihara. "Magnetoelastic constant of thin films determined by a four-point bending apparatus." Japanese Journal of Applied Physics 61, no. 3 (February 25, 2022): 036502. http://dx.doi.org/10.35848/1347-4065/ac4928.

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Abstract We have developed a method to variably induce lattice strains and to quantitatively evaluate the induced magnetic anisotropy. Both tensile and compressive strains were introduced into epitaxial films of cobalt ferrite (CFO) grown on a single crystal MgO(001) substrate using a four-point bending apparatus made of a plastic material fabricated by a 3D printer. The change in magnetic anisotropy due to bending strain can be measured quantitatively by using the conventional magneto-torque meter. The strain-induced magnetic anisotropy increased with the tensile strain and decreased with the compressive strain as expected from a phenomenological magnetoelastic theory. The magnetoelastic constant obtained from the changes in bending strains shows quantitatively good agreement with that of the CFO films with a uniaxial epitaxial strain. This signifies that the magnetoelastic constant can be evaluated by measuring only one film sample with strains applied by using the bending apparatus.

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31

De Santis, Maurizio, Aude Bailly, Ian Coates, Stéphane Grenier, Olivier Heckmann, Karol Hricovini, Yves Joly, et al. "Epitaxial growth and structure of cobalt ferrite thin films with large inversion parameter on Ag(001)." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 75, no. 1 (January 18, 2019): 8–17. http://dx.doi.org/10.1107/s2052520618016177.

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Анотація:

Cobalt ferrite ultrathin films with the inverse spinel structure are among the best candidates for spin filtering at room temperature. High-quality epitaxial CoFe2O4 films about 4 nm thick have been fabricated on Ag(001) following a three-step method: an ultrathin metallic CoFe2 alloy was first grown in coherent epitaxy on the substrate and then treated twice with O2, first at room temperature and then during annealing. The epitaxial orientation and the surface, interface and film structure were resolved using a combination of low-energy electron diffraction, scanning tunnelling microscopy, Auger electron spectroscopy and in situ grazing-incidence X-ray diffraction. A slight tetragonal distortion was observed, which should drive the easy magnetization axis in-plane due to the large magneto-elastic coupling of such a material. The so-called inversion parameter, i.e. the Co fraction occupying octahedral sites in the ferrite spinel structure, is a key element for its spin-dependent electronic gap. It was obtained through in situ resonant X-ray diffraction measurements collected at both the Co and Fe K edges. The data analysis was performed using FDMNES, an ab initio program already extensively used to simulate X-ray absorption spectroscopy, and shows that the Co ions are predominantly located on octahedral sites with an inversion parameter of 0.88 (5). Ex situ X-ray photoelectron spectroscopy gives an estimation in accordance with the values obtained through diffraction analysis.

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32

Sandu, Izabela, Lionel Presmanes, Pierre Alphonse, and Philippe Tailhades. "Nanostructured cobalt manganese ferrite thin films for gas sensor application." Thin Solid Films 495, no. 1-2 (January 2006): 130–33. http://dx.doi.org/10.1016/j.tsf.2005.08.318.

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33

Dascalu, Georgiana, Gloria Pompilian, Bertrand Chazallon, Valentin Nica, Ovidiu Florin Caltun, Silviu Gurlui, and Cristian Focsa. "Rare earth doped cobalt ferrite thin films deposited by PLD." Applied Physics A 110, no. 4 (September 8, 2012): 915–22. http://dx.doi.org/10.1007/s00339-012-7196-8.

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34

Sarıtaş, Sevda, Betul C. Şakar, Erdal Turgut, Mutlu Kundakci, and Muhammet Yıldırım. "Cobalt metal doped magnesium ferrite and zinc ferrite thin films grown by Spray Pyrolysis." Materials Today: Proceedings 46 (2021): 7025–29. http://dx.doi.org/10.1016/j.matpr.2021.03.284.

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35

Bilovol, V., L. G. Pampillo, and F. D. Saccone. "Study on target–film structural correlation in thin cobalt ferrite films grown by pulsed laser deposition technique." Thin Solid Films 562 (July 2014): 218–22. http://dx.doi.org/10.1016/j.tsf.2014.04.060.

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36

Patel, Ritesh, Takeshi Tainosho, Yuki Hisamatsu, Sonia Sharmin, Eiji Kita, and Hideto Yanagihara. "Effect of lattice strain on cobalt ferrite Co0.75Fe2.25O4(111) thin films." Japanese Journal of Applied Physics 56, no. 5 (April 18, 2017): 053001. http://dx.doi.org/10.7567/jjap.56.053001.

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37

Hu, Wei, Lilan Zou, Ruqi Chen, Wei Xie, Xinman Chen, Ni Qin, Shuwei Li, Guowei Yang, and Dinghua Bao. "Resistive switching properties and physical mechanism of cobalt ferrite thin films." Applied Physics Letters 104, no. 14 (April 7, 2014): 143502. http://dx.doi.org/10.1063/1.4870627.

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38

Na, J. G. "Fabrication and magnetic properties of metal/cobalt ferrite composite thin films." Journal of Applied Physics 79, no. 8 (1996): 4893. http://dx.doi.org/10.1063/1.361642.

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39

Schnittger, S., C. Jooss, and S. Sievers. "Magnetic and structural properties of cobalt ferrite thin films and structures." Journal of Physics: Conference Series 200, no. 7 (January 1, 2010): 072086. http://dx.doi.org/10.1088/1742-6596/200/7/072086.

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40

Yanagihara, H., Y. Utsumi, T. Niizeki, J. Inoue, and Eiji Kita. "Perpendicular magnetic anisotropy in epitaxially strained cobalt-ferrite (001) thin films." Journal of Applied Physics 115, no. 17 (May 7, 2014): 17A719. http://dx.doi.org/10.1063/1.4864048.

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41

Chu, Yan-Qiu, Zheng-Wen Fu, and Qi-Zong Qin. "Cobalt ferrite thin films as anode material for lithium ion batteries." Electrochimica Acta 49, no. 27 (October 2004): 4915–21. http://dx.doi.org/10.1016/j.electacta.2004.06.012.

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42

Yu, Yang, Karl F. Ludwig, Srikanth Gopalan, Uday Bhanu Pal, and Soumendra Nath Basu. "Role of Strain in Surface Segregation of La_1-XSr_xCo_0.2Fe_0.8O₃." ECS Meeting Abstracts MA2018-01, no. 32 (April 13, 2018): 1936. http://dx.doi.org/10.1149/ma2018-01/32/1936.

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Strontium doped lanthanum cobalt ferrite (LSCF), a widely used cathode material in solid oxide fuel cells (SOFC), can have long-term stability issues that can adversely affect electrochemical performance. Heteroepitaxial thin films of La1-x SrxCo0.2Fe0.8O3 with varying Sr content (x = 0.4, 0.3, 0.2) were deposited on single crystal NdGaO3, SrTiO3 and GdScO3 substrates by pulsed laser deposition. The lattice mismatch between the films and the substrate led to different strains in the films. The extent of Sr-rich precipitate formation on the film surface was quantified using total reflection X-ray fluorescence (TXRF), and atomic force microscopy (AFM). The microstructure and the nature of the bonding of the surface Sr-rich phases were investigated by scanning/transmission electron microscopy (S/TEM) and hard x-ray photoelectron spectroscopy (HAXPES), respectively. The strain in the thin films was measured by high-resolution x-ray diffraction (HRXRD). The combined effects of the strontium content and strain on the extent of surface phase formation will be discussed.

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43

Ruwisch, Kevin, Tobias Pohlmann, Florian Bertram, Christoph Schlüter, Andrei Gloskovskii, Karsten Küpper, and Joachim Wollschläger. "Real-Time Monitoring the Growth of Epitaxial CoxFe3−xO4 Ultrathin Films on Nb-Doped SrTiO3(001) via Reactive Molecular Beam Epitaxy by Means of Operando HAXPES." Materials 15, no. 7 (March 23, 2022): 2377. http://dx.doi.org/10.3390/ma15072377.

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In this work, we present a comprehensive study on real-time monitoring the growth of epitaxial CoxFe3−xO4 thin films grown on SrTiO3(001) substrates via reactive molecular beam epitaxy. The growth process was monitored during evaporation by means of time resolved operando hard X-ray photoelectron spectroscopy (HAXPES). We prepared ultrathin ferrite films using different oxygen partial pressures, showing pure metallic, light oxidic, and cobalt ferrite-like growth. Additional X-ray diffraction measurements confirm HAXPES results.

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44

Yang, Shao Hua, Ding Guo Li, Hai Bin Yang, and Hong Chun Yan. "Structural and Magnetic Properties of CoFe₂O₄Thin Films via Sol-Gel Method." Applied Mechanics and Materials 716-717 (December 2014): 159–62. http://dx.doi.org/10.4028/www.scientific.net/amm.716-717.159.

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Cobalt ferrite (CoFe2O4) thin films have been prepared on Si (001) substrates, with different calcined temperatures (Tcal=400°C~800°C). The films structure was studied by X-ray diffraction (XRD) and their surface was examined by scanning electron microscopy (SEM). The magnetic properties were measured with a vibrating sample magnetometer (VSM). For low calcined temperatures, the films presented a mixture of a CoFe2O4phase, with the cubic spinel structure, and cobalt and iron antiferromagnet oxides with CoO and FeO stoichiometries. As the calcined temperature increased, the CoO and FeO relative content strongly decreased, so that for Tcal=800°Cthe films were composed mainly by polycrystalline CoFe2O4. The magnetic hysteresis cycles measured in the films were horizontally shifted due to an exchange coupling field originated by the presence of the antiferromagnetic phases.

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45

Stichauer, L., Z. Simsa, P. Tailhades, and C. Despax. "Optical and Magnetooptical Properties of Copper and Cobalt-Manganese Ferrite Thin Films." Le Journal de Physique IV 07, no. C1 (March 1997): C1–729—C1–730. http://dx.doi.org/10.1051/jp4:19971298.

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46

Niizeki, Tomohiko, Takashi Kikkawa, Ken-ichi Uchida, Mineto Oka, Kazuya Z. Suzuki, Hideto Yanagihara, Eiji Kita, and Eiji Saitoh. "Observation of longitudinal spin-Seebeck effect in cobalt-ferrite epitaxial thin films." AIP Advances 5, no. 5 (May 2015): 053603. http://dx.doi.org/10.1063/1.4916978.

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47

Newby, D., J. Kuyyalil, J. Laverock, K. F. Ludwig, Y. Yu, J. Davis, S. Gopalan, U. B. Pal, S. Basu, and K. E. Smith. "Surface evolution of lanthanum strontium cobalt ferrite thin films at low temperatures." Thin Solid Films 589 (August 2015): 655–61. http://dx.doi.org/10.1016/j.tsf.2015.06.037.

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48

Barbosa, J. G., M. R. Pereira, J. A. Mendes, M. P. Proença, J. P. Araújo, and B. G. Almeida. "Cobalt ferrite thin films deposited by electrophoresis on p-doped Si substrates." Journal of Physics: Conference Series 200, no. 7 (January 1, 2010): 072009. http://dx.doi.org/10.1088/1742-6596/200/7/072009.

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49

Anjum, Safia, Ayesha Salman, M. Shahid Rafique, R. Zia, S. Riaz, and Hina Iqbal. "Investigation of Magnetic Anisotropy in Cobalt Chromium (CoCr0.5Fe1.5O4) Spinel Ferrite Thin Films." Journal of Superconductivity and Novel Magnetism 28, no. 10 (June 24, 2015): 3147–56. http://dx.doi.org/10.1007/s10948-015-3129-z.

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50

Rao, Wei, Ding Guo Li, and Hong Chun Yan. "Structural and Magnetic Properties of CoFe₂O₄ / Si (001) Thin Films via Sol-Gel Method." Advanced Materials Research 744 (August 2013): 315–18. http://dx.doi.org/10.4028/www.scientific.net/amr.744.315.

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Анотація:

Cobalt ferrite (CoFe2O4) thin films have been prepared on Si (001) substrates, with different calcined temperatures (Tcal=400°C~800°C). The films structure was studied by X-ray diffraction (XRD) and their surface was examined by scanning electron microscopy (SEM). The magnetic properties were measured with a vibrating sample magnetometer (VSM). For low calcined temperatures, the films presented a mixture of a CoFe2O4phase, with the cubic spinel structure, and cobalt and iron antiferromagnet oxides with CoO and FeO stoichiometries. As the calcined temperature increased, the CoO and FeO relative content strongly decreased, so that for Tcal=800°Cthe films were composed mainly by polycrystalline CoFe2O4. The magnetic hysteresis cycles measured in the films were horizontally shifted due to an exchange coupling field originated by the presence of the antiferromagnetic phases.

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