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Magnetic states of Mn and Co atoms at Co2MnGe/MgO interfaces seen via soft x-ray magnetic circular dichroism

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Title: Magnetic states of Mn and Co atoms at Co2MnGe/MgO interfaces seen via soft x-ray magnetic circular dichroism
Authors: Asakura, D. Browse this author
Koide, T. Browse this author
Yamamoto, S. Browse this author
Tsuchiya, K. Browse this author
Shioya, T. Browse this author
Amemiya, K. Browse this author
Singh, V. R. Browse this author
Kataoka, T. Browse this author
Yamazaki, Y. Browse this author
Sakamoto, Y. Browse this author
Fujimori, A. Browse this author
Taira, T. Browse this author
Yamamoto, M. Browse this author
Issue Date: 1-Nov-2010
Publisher: American Physical Society
Journal Title: Physical Review B
Volume: 82
Issue: 18
Start Page: 184419
Publisher DOI: 10.1103/PhysRevB.82.184419
Abstract: The magnetic states of Mn and Co atoms in Co-rich Co2MnGe Heusler alloy thin films facing an MgO barrier were studied by means of soft x-ray magnetic circular dichroism (XMCD). In particular, the Co2MnGe film-thickness dependence of the Mn and Co magnetic moments was investigated. With a decrease in the Co2MnGe film thickness to 1-2 monolayers (MLs), the spin magnetic moment of Mn decreased and the Mn L_[2,3]-edge x-ray absorption spectra (XAS) showed a Mn^[2+]-like multiplet structure in MnO, in contrast to samples thicker than 4 ML, indicating that the Mn atoms of the 1 and 2 ML samples were oxidized. The Co spin magnetic moment increased slightly with decreasing thickness. A Co^[2+]-like multiplet structure in CoO was not observed in all the Co L_[2,3]-edge XAS and XMCD, indicating that, even in the ultrathin samples, the Co atoms were not oxidized, and were more strongly spin polarized than those in the thicker samples. Co spin magnetic moments of 1.40-1.77 μB larger than the theoretical value for ideal stoichiometric Co2MnGe (∼1 μB) and the Co-rich film composition imply the presence of Co antisites that would lower the spin polarization.
Rights: ©2010 The American Physical Society
Type: article
URI: http://hdl.handle.net/2115/44429
Appears in Collections:情報科学院・情報科学研究院 (Graduate School of Information Science and Technology / Faculty of Information Science and Technology) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山本 眞史

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