Gigantic transverse x-ray magnetic circular dichroism in ultrathin Co in Au/Co/Au(001)

1st Conference on Light and Particle Beams in Materials Science 2013

物理学;材料科学

Koide, T.^1 ; Mamiya, K.^1 ; Asakura, D.^1 ; Osatune, Y.^2 ; Fujimori, A.^2 ; Suzuki, Y.^3,4 ; Katayama, T.^4 ; Yuasa, S.^4

Photon Factory, IMSS, High Energy Accelerator Research Organization, 305-0801 Tsukuba, Japan^1

Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan^2

Graduate School of Engineering Science, Osaka University, Osaka 560-8531, Toyonaka, Japan^3

NanoElectronics Research Institute, National Institute of Advanced Industrial Science and Technology, 305-8568 Tsukuba, Japan^4

关键词: Dipole dipole interactions;    In-plane magnetic anisotropy;    Orbital moment;    Sum rule;    Transverse geometry;    Ultra-thin;    X-ray magnetic circular dichroism;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/502/1/012002/pdf
DOI  :  10.1088/1742-6596/502/1/012002

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Transverse-geometry x-ray magnetic circular dichroism (TXMCD) measurements on Au/Co-staircase/Au(001) reveal the orbital origin of intrinsic in-plane magnetic anisotropy A gigantic TXMCD was successfully observed at the Co L3,2 edges for Co thickness (tC0) in the 2-monolayer regime. A TXMCD-sum-rule analysis shows a remarkable enhancement of an orbital-moment anisotropy (Δmorb) and of an in-plane magnetic dipole moment (m||T). Both Δmorb and m||T exhibit close similarity in tCo dependence, reflecting the in-plane magnetic anisotropy These observations evidence that extremely strong, intrinsic, in-plane magnetic anisotropy originates from the anisotropic orbital part of the wave function, dominating the dipole-dipole-interaction-derived, extrinsic, in-plane magnetic anisotropy.