On the magnetoelastic contribution to the magnetic anisotropy of thin epitaxial Permalloy films: an ab initio study |
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| Institution: | 1. Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, People''s Republic of China;2. Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, People''s Republic of China;3. Department of Physics, University of Texas at Arlington, Arlington, TX 76091, USA;1. Institute of Nuclear Physics, Polish Academy of Science, PL-31-342 Kraków, Poland;2. AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, PL-30-059 Kraków, Poland;1. Department of Basic Science, Modern Academy of Engineering and Technology at Maadi, Cairo, Egypt;2. Department of Physics, Faculty of Science at Damietta, University of Damietta, Damietta, Egypt;3. Department of Physics, Faculty of Science at Helwan, University of Helwan, Helwan, Egypt;1. Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan;2. Department of Applied Physics, Tunghai University, Taichung 407, Taiwan;1. Department of Materials Science and Engineering, University of North Texas, Denton, TX 76201, USA;2. School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore, Singapore;3. Department of Mechanical Engineering, Cleveland State University, Cleveland, OH 44115, USA |
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| Abstract: | Permalloy films are often used in the magnetic thin film technology. It is expected that in this material the magnetoelastic coupling of the magnetization to the epitaxial film strain does not produce undesired magnetic anisotropy, because the linear magnetoelastic bulk coefficient B1 of Permalloy is near-zero. It is shown by means of the ab initio density functional electron theory that the nonvanishing nonlinear magnetoelastic couplings also do not lead to a considerable anisotropy. Explicit values for two of the nonlinear magnetoelastic coupling coefficients are given. |
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