TY - JOUR
T1 - Enhanced perpendicular magnetocrystalline anisotropy energy in an artificial magnetic material with bulk spin-momentum coupling
AU - Pradipto, Abdul Muizz
AU - Yakushiji, Kay
AU - Ham, Woo Seung
AU - Kim, Sanghoon
AU - Shiota, Yoichi
AU - Moriyama, Takahiro
AU - Kim, Kyoung Whan
AU - Lee, Hyun Woo
AU - Nakamura, Kohji
AU - Lee, Kyung Jin
AU - Ono, Teruo
N1 - Funding Information:
A.-M.P. was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI Grant No. 15H05702. H.-W.L. acknowledges financial support from the National Research Foundation of Korea (NRF, Grant No. 2018R1A5A6075964). K.-J.L. and K.-W.K. acknowledge the KIST Institutional Program (Projects No. 2V05750 and No. 2E29410). K.-W.K. also acknowledges financial support from the German Research Foundation (DFG) (No. SI 1720/2-1). S.K. was supported by the Creative Materials Discovery Program (2018M3D1A1089406) and the Basic Research Laboratory Program (NRF-2018R1A4A1020696) through the National Research Foundation of Korea (NRF). Work was also supported in part by JSPS KAKENHI Grant No. 16K05415, the Cooperative Research Program of Network Joint Research Center for Materials and Devices, and Center for Spintronics Research Network (CSRN), Osaka University. Computations were performed at the Research Institute for Information Technology, Kyushu University.
Publisher Copyright:
© 2019 American Physical Society.
PY - 2019/5/22
Y1 - 2019/5/22
N2 - We systematically investigate the perpendicular magnetocrystalline anisotropy (MCA) in Co-Pt/Pd-based multilayers. Our magnetic measurement data show that the asymmetric Co/Pd/Pt multilayer has a significantly larger perpendicular magnetic anisotropy (PMA) energy compared to the symmetric Co/Pt and Co/Pd multilayer samples. We further support this experiment by first-principles calculations on CoPt2, CoPd2, and CoPtPd, which are composite bulk materials that consist of three atomic layers in a unit cell, Pt/Co/Pt, Pd/Co/Pd, and Pt/Co/Pd, respectively. By estimating the contribution of bulk spin-momentum coupling to the MCA energy, we show that the CoPtPd multilayer with symmetry breaking has a significantly larger PMA energy than the other multilayers that are otherwise similar but lack symmetry breaking. This observation thus provides evidence of the PMA enhancement due to the structural inversion symmetry breaking and highlights the asymmetric CoPtPd as an artificial magnetic material with bulk spin-momentum coupling, which opens a pathway toward the design of materials with strong PMA.
AB - We systematically investigate the perpendicular magnetocrystalline anisotropy (MCA) in Co-Pt/Pd-based multilayers. Our magnetic measurement data show that the asymmetric Co/Pd/Pt multilayer has a significantly larger perpendicular magnetic anisotropy (PMA) energy compared to the symmetric Co/Pt and Co/Pd multilayer samples. We further support this experiment by first-principles calculations on CoPt2, CoPd2, and CoPtPd, which are composite bulk materials that consist of three atomic layers in a unit cell, Pt/Co/Pt, Pd/Co/Pd, and Pt/Co/Pd, respectively. By estimating the contribution of bulk spin-momentum coupling to the MCA energy, we show that the CoPtPd multilayer with symmetry breaking has a significantly larger PMA energy than the other multilayers that are otherwise similar but lack symmetry breaking. This observation thus provides evidence of the PMA enhancement due to the structural inversion symmetry breaking and highlights the asymmetric CoPtPd as an artificial magnetic material with bulk spin-momentum coupling, which opens a pathway toward the design of materials with strong PMA.
UR - http://www.scopus.com/inward/record.url?scp=85066397577&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.99.180410
DO - 10.1103/PhysRevB.99.180410
M3 - Article
AN - SCOPUS:85066397577
SN - 1098-0121
VL - 99
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
IS - 18
M1 - 180410
ER -