Intrinsic anisotropy of degree of transport spin polarization in typical ferromagnets

Intrinsic anisotropy of degree of transport spin polarization in typical ferromagnets
复制标题

典型铁磁体中输运自旋极化程度的本征各向异性

DOI:
10.1088/0953-8984/20/27/275245
复制
发表时间:
2008-07
期刊:
Journal of Physics: Condensed Matter
影响因子:
--
通讯作者:
--
中科院分区:
其他
文献类型:
--
作者:

文献摘要

参考文献

相似文献

本文提出了一种研究铁磁体在弹道区和扩散区输运自旋极化度(P)随晶向的各向异性的一般方法。通过这种方法,我们已经研究了各向同性P的基准计算的有效性。通过这种方法,在bcc Fe,fcc Co,fcc Ni和hcp Co的P的各向异性。对于立方结构,P1,i显示出一个小的,但明显的各向异性,由于自旋向上和自旋向下导带的电子轨道扩展的差异。然而,P2,i示出了立方结构的各向同性特征,作为其依赖于电子速度的平方和晶格对称性的组合的结果。另一方面,对于hcp Co,P1,i和P2,i都表现出很强的各向异性。hcp Co中P1,i和P2,i的大的各向异性主要归因于自旋向下弹道(扩散)电导的各向异性。
A general approach is presented for investigation of the anisotropy of the degree of transport spin polarization (P) in ferromagnets both in the ballistic regime, P1,i, and in the diffusive regime, P2,i, as a function of crystal direction. The validity of this approach is confirmed by the benchmark calculation for the isotropic P. By this approach, we have investigated the anisotropy of P in bcc Fe, fcc Co, fcc Ni and hcp Co. For cubic structures, P1,i shows a small but appreciable anisotropy, due to the difference in the electronic orbital extension for spin-up and spin-down conduction bands. However, P2,i shows an isotropic feature for the cubic structure, as a result of the combination of its dependence on the square of electron velocity and the lattice symmetry. On the other hand, for hcp Co, both P1,i and P2,i show a very strong anisotropy. The large anisotropy of P1,i and P2,i in hcp Co is mainly attributed to the anisotropy of spin-down ballistic (diffusive) conductance.
DOI: 10.1143/jpsj.53.312
发表时间: 1984-01
影响因子: 1.7
作者:
A. Yanase;K. Siratori
通讯作者: A. Yanase;K. Siratori
DOI: 10.1103/physrevlett.96.176602
发表时间: 2006-01
影响因子: 8.6
作者:
P. Xu;K. Xia;M. Zwierzycki;M. Talanana;P. Kelly
通讯作者: P. Xu;K. Xia;M. Zwierzycki;M. Talanana;P. Kelly
DOI: 10.1063/1.1451887
发表时间: 2002-05
影响因子: 3.2
作者:
H. Jaffrès;A. Fert
通讯作者: H. Jaffrès;A. Fert
DOI: 10.1146/annurev.ms.25.080195.002323
发表时间: 1995-08
期刊: Annual Review of Materials Science
影响因子: --
作者:
Peter D. Johnson
通讯作者: Peter D. Johnson
DOI: 10.1103/physrevb.17.3725
发表时间: 1978-05
期刊: Physical Review B
影响因子: 3.7
作者:
P. B. Allen
通讯作者: P. B. Allen