Random magnetic anisotropy studies in nanocrystalline Pr2Co7Hx (0 ≤ x ≤ 3.75) hydrides
| Autor: | F.Z. Rachid, Z. Yamkane, Reda Moubah, Najeh Mliki, H. Lassri, Lotfi Bessais, R. Fersi |
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| Přispěvatelé: | Université Hassan II [Casablanca] (UH2MC), Laboratory of Physics of Materials, Microelectronics, Automation & Thermal (LPMMAT), Faculté des Sciences et Techniques [Settat] (FSTS), Université Hassan 1er [Settat]-Université Hassan 1er [Settat], Chimie métallurgique des terres rares (CMTR), Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2018 |
| Předmět: |
[PHYS]Physics [physics]
010302 applied physics Materials science Condensed matter physics Hydrogen chemistry.chemical_element 02 engineering and technology Coercivity 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Nanocrystalline material Electronic Optical and Magnetic Materials Magnetization Magnetic anisotropy Mean field theory chemistry 0103 physical sciences Curie temperature 0210 nano-technology ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Journal of Magnetism and Magnetic Materials Journal of Magnetism and Magnetic Materials, Elsevier, 2018, 449, pp.461-466. ⟨10.1016/j.jmmm.2017.10.015⟩ |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/j.jmmm.2017.10.015 |
| Popis: | We investigate the effect of hydrogen insertion on the microstructure and magnetic properties of nanocrystalline Pr 2 Co 7 H x (0 ≤ x ≤ 3.75) hydrides. The Pr 2 Co 7 H x hydrides were characterized by X-ray diffraction (XRD) and physical properties measurement system (PPMS9) Quantum Design. Mean field theory was used to describe the temperature dependence of magnetization and deduce the exchange interactions and Curie temperature. We also apply the approach to saturation magnetization to our system. The results were interpreted in the framework of random magnetic anisotropy model. From such analysis, some fundamental parameters were extracted. We have determined the local magnetic anisotropy constant K 1 which is found to increase from 5.2 × 10 7 erg/cm 3 to a maximum of 5.7 × 10 7 erg/cm 3 with increasing x from 0 to 2.5, respectively. This confirms the hypothesis of the electronic and magnetovolume effect of hydrogen insertion. In addition, it is shown that Herzer theory describes satisfactory the experimental data of change of coercive field as a function of grain size. |
| Databáze: | OpenAIRE |
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