Hysteresis of granular FePt:Ag films with perpendicular anisotropy
Intergranular interactions in nanostructured FePt:Ag thin films and their effect on magnetic hysteresis are investigated. The films, produced by multilayer deposition plus rapid thermal annealing, consist of FePt nanoparticles embedded in a silver matrix. They are investigated by magnetization measu...
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| Veröffentlicht in: | IEEE transactions on magnetics 2004-07, Vol.40 (4), p.2495-2497 |
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| container_title | IEEE transactions on magnetics |
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| creator | Yan, M.L. Skomski, R. Kashyap, A. Gao, L. Liou, S.H. Sellmyer, D.J. |
| description | Intergranular interactions in nanostructured FePt:Ag thin films and their effect on magnetic hysteresis are investigated. The films, produced by multilayer deposition plus rapid thermal annealing, consist of FePt nanoparticles embedded in a silver matrix. They are investigated by magnetization measurements and magnetic force microscopy. Analytical model calculations, supported by micromagnetic simulations, are used to elucidate the relation between coercivity, hysteresis-loop slope, and spatial correlations during magnetization reversal. The analytical calculations yield simple expressions for the loop slope and the coercivity as a function of the intergranular exchange. Small intergranular exchange enhances the coercivity, but for strong exchange there is a self-energy cutoff, associated with the onset of cooperative reversal and preventing alpha from becoming negative. |
| doi_str_mv | 10.1109/TMAG.2004.832168 |
| format | Article |
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The films, produced by multilayer deposition plus rapid thermal annealing, consist of FePt nanoparticles embedded in a silver matrix. They are investigated by magnetization measurements and magnetic force microscopy. Analytical model calculations, supported by micromagnetic simulations, are used to elucidate the relation between coercivity, hysteresis-loop slope, and spatial correlations during magnetization reversal. The analytical calculations yield simple expressions for the loop slope and the coercivity as a function of the intergranular exchange. 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The films, produced by multilayer deposition plus rapid thermal annealing, consist of FePt nanoparticles embedded in a silver matrix. They are investigated by magnetization measurements and magnetic force microscopy. Analytical model calculations, supported by micromagnetic simulations, are used to elucidate the relation between coercivity, hysteresis-loop slope, and spatial correlations during magnetization reversal. The analytical calculations yield simple expressions for the loop slope and the coercivity as a function of the intergranular exchange. 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| subjects | Analytical models Anisotropic magnetoresistance Coercive force Condensed matter: electronic structure, electrical, magnetic, and optical properties Exact sciences and technology Magnetic films Magnetic hysteresis Magnetic multilayers Magnetic properties and materials Magnetism Magnetization Nanoparticles Physics Rapid thermal annealing Silver |
| title | Hysteresis of granular FePt:Ag films with perpendicular anisotropy |
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