Random magnetic anisotropy studies in nanocrystalline Pr 2 Co 7 H x (0 ≤ x ≤ 3.75) hydrides
作者： Z. Yamkane , R. Fersi , F.Z. Rachid , R. Moubah , H. Lassri
DOI: 10.1016/J.JMMM.2017.10.015
关键词: Nanocrystalline material 、 Hydrogen 、 Coercivity 、 Curie temperature 、 Magnetic anisotropy 、 Condensed matter physics 、 Magnetization 、 Mean field theory 、 Microstructure 、 Materials science
摘要: Abstract We investigate the effect of hydrogen insertion on microstructure and magnetic properties nanocrystalline Pr 2 Co 7 H x (0 ≤ x ≤ 3.75) hydrides. The hydrides were characterized by X-ray diffraction (XRD) physical measurement system (PPMS9) Quantum Design. Mean field theory was used to describe temperature dependence magnetization deduce exchange interactions Curie temperature. also apply approach saturation our system. results interpreted in framework random anisotropy model. From such analysis, some fundamental parameters extracted. have determined local constant K 1 which is found increase from 5.2 × 10 erg/cm 3 a maximum 5.7 × 10 with increasing 0 2.5, respectively. This confirms hypothesis electronic magnetovolume insertion. In addition, it shown that Herzer describes satisfactory experimental data change coercive as function grain size.
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