TY - JOUR
T1 - Magnetic anisotropy of L 1 0 -ordered FePt thin films studied by Fe and Pt L 2,3 -edges x-ray magnetic circular dichroism
AU - Ikeda, K.
AU - Seki, T.
AU - Shibata, G.
AU - Kadono, T.
AU - Ishigami, K.
AU - Takahashi, Y.
AU - Horio, M.
AU - Sakamoto, S.
AU - Nonaka, Y.
AU - Sakamaki, M.
AU - Amemiya, K.
AU - Kawamura, N.
AU - Suzuki, M.
AU - Takahashi, K.
AU - Fujimori, A.
N1 - Funding Information:
This work was supported by Grants-in-Aid for Scientific Research from JSPS (Grant Nos. 15H02109 and 15K17696) and Nanotechnology Platform (Project No. 12024046) from MEXT. The experiment was performed at BL-16A of KEK-PF with the approval of the Photon Factory Program Advisory Committee (Proposal Nos. 2013S2-004, 2014G-177, 2016G066, and 2016S2-005) and at BL39XU of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal Nos. 2014A1158 and 2015B1461). S.S. acknowledges financial support from the Advanced Leading Graduate Course for Photon Science (ALPS) and the JSPS Research Fellowship for Young Scientists. A.F. is an adjunct member of the Center for Spintronics Research Network (CSRN), the University of Tokyo, under the Spintronics Research Network of Japan (Spin-RNJ). T.S. and K.T. are members of CSRN, Tohoku University, under Spin-RNJ. We thank V. K. Verma and T. Harano for technical support.
Publisher Copyright:
© 2017 Author(s).
PY - 2017/10/2
Y1 - 2017/10/2
N2 - The strong perpendicular magnetic anisotropy of L10-ordered FePt has been the subject of extensive studies for a long time. However, it is not known which element, Fe or Pt, mainly contributes to the magnetic anisotropy energy. We have investigated the anisotropy of the orbital magnetic moments of Fe 3d and Pt 5d electrons in L10-ordered FePt thin films by Fe and Pt L2,3-edge x-ray magnetic circular dichroism (XMCD) measurements for samples with various degrees of long-range chemical order S. Fe L2,3-edge XMCD showed that the orbital magnetic moment was larger when the magnetic field was applied perpendicular to the film than parallel to it and that the anisotropy of the orbital magnetic moment increased with S. Pt L2,3-edge XMCD also showed that the orbital magnetic moment was smaller when the magnetic field was applied perpendicular to the film than parallel to it, opposite to the Fe L2,3-edge XMCD results although the anisotropy of the orbital magnetic moment increases with S like the Fe edge. These results are qualitatively consistent with the first-principles calculation by Solovyev et al. [Phys. Rev. B 52, 13419 (1995)], which also predicts the dominant contributions of Pt 5d to the magnetic anisotropy energy rather than Fe 3d due to the strong spin-orbit coupling and the small spin splitting of the Pt 5d bands in L10-ordered FePt.
AB - The strong perpendicular magnetic anisotropy of L10-ordered FePt has been the subject of extensive studies for a long time. However, it is not known which element, Fe or Pt, mainly contributes to the magnetic anisotropy energy. We have investigated the anisotropy of the orbital magnetic moments of Fe 3d and Pt 5d electrons in L10-ordered FePt thin films by Fe and Pt L2,3-edge x-ray magnetic circular dichroism (XMCD) measurements for samples with various degrees of long-range chemical order S. Fe L2,3-edge XMCD showed that the orbital magnetic moment was larger when the magnetic field was applied perpendicular to the film than parallel to it and that the anisotropy of the orbital magnetic moment increased with S. Pt L2,3-edge XMCD also showed that the orbital magnetic moment was smaller when the magnetic field was applied perpendicular to the film than parallel to it, opposite to the Fe L2,3-edge XMCD results although the anisotropy of the orbital magnetic moment increases with S like the Fe edge. These results are qualitatively consistent with the first-principles calculation by Solovyev et al. [Phys. Rev. B 52, 13419 (1995)], which also predicts the dominant contributions of Pt 5d to the magnetic anisotropy energy rather than Fe 3d due to the strong spin-orbit coupling and the small spin splitting of the Pt 5d bands in L10-ordered FePt.
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U2 - 10.1063/1.4993077
DO - 10.1063/1.4993077
M3 - Article
AN - SCOPUS:85030768793
SN - 0003-6951
VL - 111
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 14
M1 - 142402
ER -