Perpendicular magnetic anisotropy in a Pt/Co/Pt ultrathin film arising from a lattice distortion induced by ion irradiation

M. Sakamaki, K. Amemiya, M. O. Liedke, J. Fassbender, P. Mazalski, I. Sveklo, and A. Maziewski
Phys. Rev. B 86, 024418 – Published 16 July 2012

Abstract

Ga+ irradiation-induced changes in magnetic anisotropy and crystalline structure of a Pt/Co/Pt ultrathin film are investigated by means of x-ray magnetic circular dichroism (XMCD) and extended x-ray absorption fine structure (EXAFS) techniques. The XMCD analysis shows a large orbital moment difference between out-of-plane and in-plane directions, which corresponds to perpendicular magnetic anisotropy (PMA), at moderate Ga+ fluences, while further increased fluences reduce the orbital moment difference resulting in in-plane magnetization. From the EXAFS analysis, enhancement of PMA is directly related to an in-plane lattice expansion caused by ion irradiation and Co-Pt intermixing, which results in a large lattice distortion. Thus, the origin of the ion irradiation-induced changes in magnetic anisotropy is successfully explained.

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  • Received 15 April 2012

DOI:https://doi.org/10.1103/PhysRevB.86.024418

©2012 American Physical Society

Authors & Affiliations

M. Sakamaki and K. Amemiya

  • Photon Factory and Condensed Matter Research Center, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan

M. O. Liedke and J. Fassbender

  • Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany

P. Mazalski, I. Sveklo, and A. Maziewski

  • Department of Physics, University of Bialystok, ul. Lipowa 41, Bialystok, Poland

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Issue

Vol. 86, Iss. 2 — 1 July 2012

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