Relevant bibliographies by topics / Reversible magnetisation

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Reversible magnetisation'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Reversible magnetisation"

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Liang, W. Y., and J. W. Loram. "Magneto-calorimetric studies of reversible magnetisation." Physica C: Superconductivity 404, no. 1-4 (May 2004): 230–40. http://dx.doi.org/10.1016/j.physc.2003.09.099.

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Hirsinger, L., and R. Billardon. "Identification of the reversible domain of magnetisation of soft ferromagnetic materials." Journal of Magnetism and Magnetic Materials 226-230 (May 2001): 1257–59. http://dx.doi.org/10.1016/s0304-8853(00)01007-6.

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Schümann, M., D. Yu Borin, J. Morich, and S. Odenbach. "Reversible and non-reversible motion of NdFeB-particles in magnetorheological elastomers." Journal of Intelligent Material Systems and Structures 32, no. 1 (August 12, 2020): 3–15. http://dx.doi.org/10.1177/1045389x20949703.

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Magnetorheological elastomers are a class of smart hybrid material where magnetic microparticles are embedded in an elastomer matrix. The combination of elastic and magnetic properties leads to highly complex material behaviour, which is strongly affected by the arrangement and the magnetically induced motion of the magnetic particles. Thus, the knowledge of the internal particle structure is key to gain a deeper understanding of the complex material behaviour. In this paper, X-ray microtomography was applied to analyse the internal particle structure of a magnetorheological elastomer containing magnetically hard NdFeB-particles. A stepwise magnetisation of the material enabled a detailed characterisation of the occurring non-reversible chain formation process. Furthermore, the application of magnetic fields during measurements enabled an analysis of a mostly reversible particle motion occurring in connection with the magnetorheological effect. The collected tomography data of the particle structure was evaluated on a single particle basis as well as by means of a direction-dependent pair correlation function. To provide a scale bridging between macroscopic and microscopic properties, the found results regarding the particle motion were linked to mechanical and magnetic properties of the material.
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Shchapova, E. A., A. N. Stashkov, and A. P. Nichipuruk. "Results of magnetometry data processing for non-destructive testing of compressive mechanical stress levels in steels." Journal of «Almaz – Antey» Air and Space Defence Corporation, no. 1 (March 30, 2018): 80–85. http://dx.doi.org/10.38013/2542-0542-2018-1-80-85.

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We plotted the fields of measurement coil signal as functions inversely proportional to reversible magnetisation in low-carbon St20 steel plates subjected to plastic tensile strain. Performing an additional approximation of our experimental data using three pseudo-Voigt functions allowed us to detect the information concerning irreversible motion of the 90-degree domain walls that are most sensitive to mechanical stresses. As a result of performing mathematical processing of experimental data we managed to improve validity of estimating the fields of stress-induced magnetic anisotropy and mechanical stresses.
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Muroi, Michihito, and Robert Street. "Evolution of Ferromagnetism in LaMnO3+δ." Australian Journal of Physics 52, no. 2 (1999): 205. http://dx.doi.org/10.1071/p98059.

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An extensive study has been made of the magnetic properties of LaMnO3+δ with finely tuned hole concentrations, x (=2δ), ranging between 0·08 and 0·15. As x increases in the range studied, the spontaneous magnetisation at low temperature increases from only about 20% to almost 100% of the value for full polarisation of Mn spins, and the coercivity Hc decreases by more than an order of magnitude, e.g. from 4·2 kOe to 120 Oe at 5 K. The magnetic ordering temperature Tc takes a minimum at x = xc ~ 0·12. For x < xc, the inverse susceptibility shows a marked decrease as Tc is approached from above. Measurements of minor hysteresis loops for the sample with x = 0·08 show that magnetisation is reversible with respect to field changes except near Hc. These observations are discussed in terms of a two-phase exchange coupling (TPEC) model in which it is assumed that at low temperature the system separates into two phases, a hole-free antiferromagnetic phase and an optimally doped ferromagnetic phase, and the two phases are coupled through superexchange interactions at the interface.
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Bissell, P. R., and A. Lyberatos. "Reversible changes during remanent magnetisation and demagnetisation processes in particulate and thin film recording media." Journal of Magnetism and Magnetic Materials 95, no. 1 (April 1991): 27–34. http://dx.doi.org/10.1016/0304-8853(91)90210-2.

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Brown, J. William L., Ferran Prados Carrasco, Arman Eshaghi, Carole H. Sudre, Tom Button, Matteo Pardini, Rebecca S. Samson, et al. "Periventricular magnetisation transfer ratio abnormalities in multiple sclerosis improve after alemtuzumab." Multiple Sclerosis Journal 26, no. 9 (June 6, 2019): 1093–101. http://dx.doi.org/10.1177/1352458519852093.

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Background: In multiple sclerosis (MS), disease effects on magnetisation transfer ratio (MTR) increase towards the ventricles. This periventricular gradient is evident shortly after first symptoms and is independent of white matter lesions. Objective: To explore if alemtuzumab, a peripherally acting disease-modifying treatment, modifies the gradient’s evolution, and whether baseline gradients predict on-treatment relapses. Methods: Thirty-four people with relapsing-remitting MS underwent annual magnetic resonance imaging (MRI) scanning (19 receiving alemtuzumab (four scans each), 15 untreated (three scans each)). The normal-appearing white matter was segmented into concentric bands. Gradients were measured over the three bands nearest the ventricles. Mixed-effects models adjusted for age, gender, relapse rate, lesion number and brain parenchymal fraction compared the groups’ baseline gradients and evolution. Results: Untreated, the mean MTR gradient increased (+0.030 pu/band/year) but decreased following alemtuzumab (−0.045 pu/band/year, p = 0.037). Within the alemtuzumab group, there were no significant differences in baseline lesion number ( p = 0.568) nor brain parenchymal fraction ( p = 0.187) between those who relapsed within 4 years ( n = 4) and those who did not ( n = 15). However, the baseline gradient was significantly different ( p = 0.020). Conclusion: Untreated, abnormal periventricular gradients worsen with time, but appear reversible with peripheral immunotherapy. Baseline gradients – but not lesion loads or brain volumes – may predict on-treatment relapses. Larger confirmatory studies are required.
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Babic, D. "The reversible magnetisation of YBa2Cu3O7−δ crystals: 3D XY critical fluctuations and a field-dependent correlation volume." Physica B: Condensed Matter 284-288 (July 2000): 769–70. http://dx.doi.org/10.1016/s0921-4526(99)02068-2.

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Aghadavoudi Jolfaei, Mohsen, Lei Zhou, and Claire Davis. "Consideration of Magnetic Measurements for Characterisation of Ferrite–Martensite Commercial Dual-Phase (DP) Steel and Basis for Optimisation of the Operating Magnetic Field for Open Loop Deployable Sensors." Metals 11, no. 3 (March 16, 2021): 490. http://dx.doi.org/10.3390/met11030490.

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The magnetic properties of commercial dual-phase (DP) steels (DP600, DP800 and DP1000 grades) were evaluated using initial permeability, incremental permeability and coercivity and correlated with the key microstructural differences between the grades. The ferrite grain sizes and ferrite fractions have been compared with the magnetic parameters obtained from minor and major magnetisation loops within each DP grade. It has been revealed that the incremental permeability increases with the applied magnetic field amplitude to reach a peak and then drops at a higher magnetic field, with the values being different for the three DP grades at a lower field and converging to a similar permeability value at the high field. The effects of ferrite grain size and phase fraction on the incremental permeability are considered, and it has been shown that the influence of ferrite grain boundaries on magnetic permeability is more dominant than the effect of ferrite fraction in commercial DP steel samples. An analysis of the correlation between coercivity and initial permeability with tensile strength shows that the initial permeability provides a slightly better prediction of strength for the steels examined, which is believed to be due to the fact that a combination of reversible and irreversible domain components affect the coercivity value, while the initial permeability is predominantly affected by reversible domain movements. Based on the trend between incremental permeability and applied magnetic field and the commercial EM sensor (EMspec) operating parameters, the effect of lift-off and hence magnetic field strength on the sensitivity to DP steel properties can be assessed.
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Sibson, Nicola R., John P. Lowe, Andrew M. Blamire, Matthew J. Martin, Tiho P. Obrenovitch, and Daniel C. Anthony. "Acute Astrocyte Activation in Brain Detected by Mri: New Insights into T1 Hypointensity." Journal of Cerebral Blood Flow & Metabolism 28, no. 3 (September 12, 2007): 621–32. http://dx.doi.org/10.1038/sj.jcbfm.9600549.

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Increases in the T1 of brain tissue, which give rise to dark or hypointense areas on T1-weighted images using magnetic resonance imaging (MRI), are common to a number of neuropathologies including multiple sclerosis (MS) and ischaemia. However, the biologic significance of T1 increases remains unclear. Using a multiparametric MRI approach and well-defined experimental models, we have experimentally induced increases in tissue T1 to determine the underlying cellular basis of such changes. We have shown that a rapid acute increase in T1 relaxation in the brain occurs in experimental models of both low-flow ischaemia induced by intrastriatal injection of endothelin-1 (ET-1), and excitotoxicity induced by intrastriatal injection of N-methyl-d-aspartate (NMDA). However, there appears to be no consistent correlation between increases in T1 relaxation and changes in other MRI parameters (apparent diffusion coefficient, T2 relaxation, or magnetisation transfer ratio of tissue water). Immunohistochemically, one common morphologic feature shared by the ET-1 and NMDA models is acute astrocyte activation, which was detectable within 2 h of intracerebral ET-1 injection. Pretreatment with an inhibitor of astrocyte activation, arundic acid, significantly reduced the spatial extent of the T1 signal change induced by intrastriatal ET-1 injection. These findings suggest that an increase in T1 relaxation may identify the acute development of reactive astrocytes within a central nervous system lesion. Early changes in T1 may, therefore, provide insight into acute and reversible injury processes in neurologic patients, such as those observed before contrast enhancement in MS.
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Dissertations / Theses on the topic "Reversible magnetisation"

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Harrison, Simon Andrew. "Characterisation of the mechanisms of magnetisation change in permanent magnet materials through the interpretation of hysteresis measurements." University of Western Australia. School of Physics, 2004. http://theses.library.uwa.edu.au/adt-WU2004.0048.

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The mechanisms by which magnetisation changes occur in magnetic materials may be investigated by a variety of hysteresis measurements. During this study both alternating and rotational hysteresis measurements were used to characterise the mechanisms of magnetisation change in a number of permanent magnet materials. Studies of the time dependence of magnetisation, remanent magnetisations and the dependence of the reversible magnetisation on the irreversible magnetisation were undertaken. These studies revealed that in sintered rare-earth iron magnets the magnetisation change is predominately controlled by domain nucleation, with a lesser contribution from domain wall pinning within the boundary regions of the grains. Similar mechanisms control the magnetisation change in the larger grains of melt-quenched rare-earth iron magnets. In the single domain grains of the melt-quenched materials incoherent rotation mechanisms control the changes of magnetisation. Magnetisation change in MnAlC and sintered AlNiCo was found to be controlled by domain wall pinning within the interior of the grains of the materials. Two devices were constructed for the measurement of rotational hysteresis. The first measures the angular acceleration of a sample set spinning in a magnetic field, from which the rotational hysteresis loss may be determined. The second employs rotating search coils to make direct measurements of the component of magnetisation that contributes to rotational hysteresis loss during the rotation of a sample in a field. Both devices were found to produce data consistent with that in the literature and to be useful for the characterisation of rotational hysteresis in permanent magnet materials. A simple model was used to examine the dependence of rotational hysteresis loss on various material parameters. It was found that the value of the rotational hysteresis integral is dependent on interactions and to a lesser extent distributions in anisotropy. This is contrary to assumptions commonly made in the literature but consistent with published experimental data, which has been reinterpreted. Measurements of rotational hysteresis losses in the materials studied were found to be effected by geometric demagnetisation effects. A method by which such data may be corrected for these effects is proposed. Following correction and consideration of the interactions within the materials, the rotational hysteresis data was found to be consistent with the characterisations performed in linearly alternating fields.
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Conference papers on the topic "Reversible magnetisation"

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Bissell, P. R., and A. Lyberatos. "Reversible changes during remanent magnetisation processes in recording media." In International Conference on Magnetics. IEEE, 1990. http://dx.doi.org/10.1109/intmag.1990.734458.

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