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Studies on the magnetic anisotropy in single-layer films and magnetic interaction in bilayer films :

单层薄膜磁各向异性和双层薄膜磁相互作用的研究：

基本信息

批准号：
13650761
负责人：
KOHMOTO Osamu
金额：
$ 1.54万
依托单位：
OKAYAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650761/
关键词：
Single-layer film Double-layer Film Exchange field Magnetic interaction Ferromagnetic resonance Coupling field Magnetoresistance 交換結合磁場スパッタ Ni Co

项目摘要

1. Theoretical investigation of ferromagnetic resonance (FMR) has been done. To analyze the magnetic anisotropy, exact solution proposed by Smit and beljers and approximate solution by Kittel is known. However, equation of effective demagnetizing factors (N_x^e, N_y^e) by Kittel is not correct. We derived a new equation of N_x^e and H_y^e and we obtained resonance equation for thin films. By this derivation method, the resonance equations of thin films having a uniaxial or a fourfold anisotropy are obtained when a static field is rotated in the film plane, six arrangements are calculated : (1) perpendicular anisotropy, (2) in-plane anisotropy, (3) cubic-crystal (001) face, (4) cubic-crystal (011) face, (5) cubic-crystal (111) face, and (6) oblique anisotropy films.2. Magnetic anisotropy of Co and Ni films and magnetoresistance of bilayer films of Ni/NiO and NiFe/NiO has been experimentally studied. (1) In single layer Ni films, a large perpendicular anisotropy field was observed by FMR.(2) In Co films, Perpendicular anisotropy field increases with decreasing the thickness.(3) In bilayer Ni/NiO and NiFe/NiO films, magetoresistance was studied.

1. 对铁磁共振（FMR）进行了理论研究。为了分析磁各向异性，已知Smit和beljers提出的精确解和Kittel提出的近似解。然而，Kittel的有效退磁因子（N_x^e, N_y^e）方程是不正确的。我们导出了一个新的N_x^e和H_y^e方程，并得到了薄膜的共振方程。通过这种推导方法，得到了静场在膜平面旋转时具有单轴和四轴各向异性薄膜的共振方程，计算了六种排列方式：(1)垂直各向异性，(2)面内各向异性，(3)立方晶体（001）面，(4)立方晶体（011）面，(5)立方晶体（111）面，(6)倾斜各向异性薄膜。实验研究了Co和Ni薄膜的磁各向异性以及Ni/NiO和NiFe/NiO双层薄膜的磁电阻。(1)在单层Ni薄膜中，FMR观察到较大的垂直各向异性场。(2)在Co薄膜中，垂直各向异性场随厚度的减小而增大。(3)研究了双层Ni/NiO和NiFe/NiO薄膜的磁阻。