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《Progress in Physics》 2006-Z1
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ZHANG Zhi-dong(Shenyang National Laboratory for Materials Science,Institute of Metal Research and International Center for Materials Physics,Chinese Academy of Sciences,72 Wenhua Road,Shenyang 110016)  
Recent progress in nanocomposited rare-earth permanent magnetic films and anisotropic rare-earth permanent magnetic films was briefly reviewed.The exchange coupling and remanence enhancement were realized in nanocomposited rare-earth permanent magnetic films fabricated by sputtering.The relations between structure and magnetic properties of nanocomposited permanent magnetic films were studied.On the other hand,anisotropic Nd-Fe-B permanent magnetic films with c-axis texture and high maximum energy products were fabricated by sputtering.The influence of Ti or Mo buffer layer thickness and substrate temperature on the surface morphology,the domain structure and the magnetic properties was investigated and compared for the Nd-Fe-B films.It was found that the morphology of the surface strongly depended on the thickness of the buffer layer.The microstructure,the surface morphology and magnetic properties of Nd-Fe-B thin films were strongly dependent on the deposition rate,which was mainly due to the variation of chemical compositions in the thin films.The coercivity mechanism of the anisotropic Pr-Fe-B films was studied by analyzing the temperature dependence of coercivity from 5 to 300 K,based on the micromagnetic model.Nucleation of reversed domains,taking place preferentially at the grain surface where the magnetic anisotropy was reduced and the local demagnetization field was the highest,was determined to be the leading mechanism in controlling the magnetization reversal processes of the anisotropic Pr-Fe-B films.
【Fund】: 国家自然科学基金项目资助(50331030)
【CateGory Index】: TM273
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