Theoretical Study for Ferromagnetic/Nonmagnetic Metallic Multilayrs

铁磁/非磁金属多层膜的理论研究

基本信息

批准号：
08640446
负责人：
ASANO Setsuro
金额：
$ 1.34万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08640446/
关键词：
metallic multilayr magnetic anisotropy magneto-optical effect half-metal magnetism crystallene field electronic structure metallic multilayer magnetic anisotropy magneto-optical effect magnetism half-metal halh-metal electronic s

项目摘要

1) The perpendicular magnetic anisotropy energy in the ferromagnetic/nonmagnetic metallic multilayrs were investigated calculating the electronic structures by LMTO-ASA method within the framework of the local-density-approximation, for X/Co (X= Pd, Pt, Cu, Ag, Au, Ni) and X/Fe (X=Ag, Au, Ni) systems. We have found that the general tendency of the perpendicular magnetic anisotropy energy (MAE) in these systems are well explained by first-principles calculations. The thickness of Co (ferromagnetic) layr dependence and the strain dependence of the MAE were also investigated.2) The magnetic properties of rare-earth and 3d transition metal compounds are enhanced by the addition of N,C or B.We have calculated the electronic charge density maps and the spindensity maps of GdFe_<12>, GdFe_<12>N,Gd_2Fe_<17> and Gd_2Fe_<17>N_3 by the FLAPW method and clarified the microscopic origin of the strong uniaxial magnetic anisotropy energy due to the addition of N or C.It was also found that the addition of N is most effective to enhance the magnetism of these compounds.3)We have also calculated the MAE due to the spin-orbit coupling of 3d transition metal itself for YCo_5, Y_2Co_7, YCo_3 and Y_2Co_<17> by the LMTO method including the spin-orbit coupling term.4)We have also performed the preliminary calculation of the magneto-optical (Kerr) effect by the LMTO method for hcp-Co, fcc-Co, and ferromagnetic/nonmagnetic metallic multilayrs Fe (nML) /Au (nML) (n=1,2,3,4) and TM (1ML) /X (2ML)(TM=Mn, Fe, Co ; X=Pd, Pt, Ag, Au) systems.5)We have also performed the first principles calculations to predict theoretically new half-metallic compounds to realize the half-metallic/nonmagnetic multilayr.

1）研究了X/co（x = pd，pt，pt，pt，pt，pt，pt，pt，pt，pt，pt，pt，pt，pt，pt，pt，cu，ag，au，ni（ni），研究了铁磁/非磁金属多层中的垂直磁各向异性能量，通过LMTO-ASA方法计算通过LMTO-ASA方法计算电子结构的垂直磁各向异性能量。我们发现，在这些系统中，垂直磁各向异性能量（MAE）的一般趋势通过第一原理计算很好地解释了。还研究了CO（铁磁）Layr依赖性和MAE的应变依赖性的厚度。2）通过添加N，C或B的添加来增强稀土和3D过渡金属化合物的磁性，并计算了电子电荷密度图和GDFE_ <12ffe_ <12> gdfe_ <12> n，gd <12> n，gd <12> n，gd <12> n，gd gd_ gd gd <12> n，gd gd_ gd gd_ gd <12> gd gd gd <12> gd gd <12> n，gd <12> n，gd gd <12> n，gd gd <12> n，gd gd gd， GD_2FE_ <17> N_3通过FLAPW方法，并阐明了由于添加n或c而导致的强磁性各向异性能量的显微镜起源，还发现N添加最有效地增强了这些化合物的磁性最有效3）我们还计算了3 co_的MAE。 and Y_2Co_<17> by the LMTO method including the spin-orbit coupling term.4)We have also performed the preliminary calculation of the magneto-optical (Kerr) effect by the LMTO method for hcp-Co, fcc-Co, and ferromagnetic/nonmagnetic metallic multilayrs Fe (nML) /Au (nML) (n=1,2,3,4)和TM（1ML） /X（2ML）（TM = Mn，Fe，Co; x = pd，pt，ag，au）系统。5）我们还执行了第一个原理计算，以预测理论上新的半金属化合物，以实现半金属/非磁性多层。