Enhanced perpendicular magnetocrystalline anisotropy energy in an artificial magnetic material with bulk spin-momentum coupling

Abdul Muizz Pradipto, Kay Yakushiji, Woo Seung Ham, Sanghoon Kim, Yoichi Shiota, Takahiro Moriyama, Kyoung Whan Kim, Hyun Woo Lee, Kohji Nakamura, Kyoung Jin Lee, Teruo Ono

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Article number180410
JournalPhysical Review B
Volume99
Issue number18
DOIs
Publication statusPublished - 2019 May 22

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Magnetocrystalline anisotropy
Magnetic materials
magnetic materials
Magnetic anisotropy
Momentum
Multilayers
momentum
anisotropy
broken symmetry
energy
Magnetic variables measurement
magnetic measurement
estimating
inversions
Composite materials
composite materials
augmentation
cells
Experiments

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Enhanced perpendicular magnetocrystalline anisotropy energy in an artificial magnetic material with bulk spin-momentum coupling. / Pradipto, Abdul Muizz; Yakushiji, Kay; Ham, Woo Seung; Kim, Sanghoon; Shiota, Yoichi; Moriyama, Takahiro; Kim, Kyoung Whan; Lee, Hyun Woo; Nakamura, Kohji; Lee, Kyoung Jin; Ono, Teruo.

In: Physical Review B, Vol. 99, No. 18, 180410, 22.05.2019.

Research output: Contribution to journalArticle

Pradipto, AM, Yakushiji, K, Ham, WS, Kim, S, Shiota, Y, Moriyama, T, Kim, KW, Lee, HW, Nakamura, K, Lee, KJ & Ono, T 2019, 'Enhanced perpendicular magnetocrystalline anisotropy energy in an artificial magnetic material with bulk spin-momentum coupling', Physical Review B, vol. 99, no. 18, 180410. https://doi.org/10.1103/PhysRevB.99.180410
Pradipto, Abdul Muizz ; Yakushiji, Kay ; Ham, Woo Seung ; Kim, Sanghoon ; Shiota, Yoichi ; Moriyama, Takahiro ; Kim, Kyoung Whan ; Lee, Hyun Woo ; Nakamura, Kohji ; Lee, Kyoung Jin ; Ono, Teruo. / Enhanced perpendicular magnetocrystalline anisotropy energy in an artificial magnetic material with bulk spin-momentum coupling. In: Physical Review B. 2019 ; Vol. 99, No. 18.
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