Influence of controlled surface oxidation on the magnetic anisotropy of Co ultrathin films

被引：25

作者：

Di, N. ^{[1
]}

Kubal, J. ^{[2
]}

Zeng, Z. ^{[2
]}

Greeley, J. ^{[2
]}

Maroun, F. ^{[1
]}

Allongue, P. ^{[1
]}

机构：

[1] Ecole Polytech, Phys Matiere Condensee, CNRS, F-91128 Palaiseau, France

[2] Purdue Univ, Sch Chem Engn, W Lafayette, IN 47907 USA

来源：

APPLIED PHYSICS LETTERS | 2015年 / 106卷 / 12期

关键词：

AUGMENTED-WAVE METHOD; IN-SITU STM; TRENDS; LAYERS; WATER; OXIDE;

D O I：

10.1063/1.4916554

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We studied the influence of controlled surface-limited oxidation of electrodeposited epitaxial Co(0001)/Au(111) films on their magnetic anisotropy energy using real time in situ magneto optical Kerr effect and density functional theory (DFT) calculations. We investigated the Co first electrochemical oxidation step which we demonstrate to be completely reversible and determined the structure of this oxide layer. We show that the interface magnetic anisotropy of the Co film increases by 0.36 erg/cm(2) upon Co surface oxidation. We performed DFT calculations to determine the different surface structures in a wide potential range as well as the charge transfer at the Co surface. Our results suggest that the magnetic anisotropy change is correlated with a positive charge increase of 0.54e(-) for the Co surface atom upon oxidation. (C) 2015 AIP Publishing LLC.

引用

页数：4

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