Magnetic and electronic studies in the granular (Ni0.84Fe0.16)54(alumina)46 sputtered thin films |
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| Authors: | N. Omari H. Lassri A. Fnidiki M. Abid E.K. Hlil |
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| Affiliation: | 1. PTA, Université Hassan II-Casablanca, Faculté des Sciences, B.P. 5366 Maârif, Maroc;2. Institut Néel CNRS, Département MCMF, B.P. 166, 38042 Grenoble Cedex 9, France;3. LPMMAT, Université Hassan II-Casablanca, Faculté des Sciences, B.P. 5366 Maârif, Maroc;4. Groupe de Physique des Matériaux, UMR CNRS 6634, Faculté des Sciences de Rouen, Site Universitaire du Madrillet, Avenue de l''Université, B.P. 12, 76801 Saint-Etienne du Rouvray Cedex, France |
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| Abstract: | We have studied the magnetization in the granular (Ni0.84Fe0.16)54(alumina)46 alloy. The thermomagnetization curve is found to obey the Bloch law. Spin wave stiffness constant D and the exchange constant A were calculated from the experimental results. The magnetic experimental measurements have been interpreted in the framework of random magnetic anisotropy (RMA) model. The results have shown that it is possible to extend the application of RMA to the granular alloy. From an analysis of the approach to saturation magnetization some fundamental parameters have been extracted. In addition, self-consistent ab initio calculations, based on Korringa–Kohn–Rostocker (KKR), are performed to investigate magnetic and electronic properties of the granular alloy. Spin polarization within the framework of the coherent potential approximation (CPA) is considered. |
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| Keywords: | Granular alloy Magnetization Spin waves Random magnetic anisotropy Electronic structure calculations Ab initio |
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