Surface-induced antiparallel coupling at the surface of a B2-ordered FeCr alloy

被引：4

作者：

Bouzar, H

Benakki, M

Zemirli, M

Mokrani, A

Demangeat, C

Dreysse, H

机构：

[1] GEMME,IPCMS,F-67037 STRASBOURG,FRANCE

[2] UNIV TIZI OUZOU,INST PHYS,TIZI OUZOU,ALGERIA

[3] LPME,FA11S3 DS4,F-44072 NANTES,FRANCE

来源：

SURFACE SCIENCE | 1997年 / 381卷 / 2-3期

关键词：

iron/chromium alloy; spin-flip; surface magnetism;

D O I：

10.1016/S0039-6028(97)00076-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Using a self-consistent tight-binding real-space model within the unrestricted Hartree-Fock approximation to the Hubbard Hamiltonian, we have investigated local polarisation at the low Miller-index surfaces of an FeCr (B2) alloy. In all cases, i.e. (001), (110) and (111), the local polarisation at the surface is found to be antiferromagnetically coupled with the subsurface layer, in contrast to the parallel coupling between Fe and Cr in bulk FeCr. This spin-flip configuration is directly related to surface effects, and means that the differences between recent in-situ magnetometer measurements and energy-resolved spin-polarised secondary-electron emission could be due to alloy formation at the Fe/Cr interface. (C) 1997 Elsevier Science B.V.

引用

页码：117 / 122

页数：6

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