Effects of Interfacial Oxidization on Magnetic Damping and Spin-Orbit Torques

Dongjoon Lee, Wonmin Jeong, Deokhyun Yun, Seung Young Park, Byeong Kwon Ju, Kyung Jin Lee, Byoung Chul Min, Hyun Cheol Koo, Oukjae Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We investigate the effects of interfacial oxidation on the perpendicular magnetic anisotropy, magnetic damping, and spin-orbit torques in heavy-metal (Pt)/ferromagnet (Co or NiFe)/capping (MgO/Ta, HfOx, or TaN) structures. At room temperature, the capping materials influence the effective surface magnetic anisotropy energy density, which is associated with the formation of interfacial magnetic oxides. The magnetic damping parameter of Co is considerably influenced by the capping material (especially MgO) while that of NiFe is not. This is possibly due to extra magnetic damping via spin-pumping process across the Co/CoO interface and incoherent magnon generation (spin fluctuation) developed in the antiferromagnetic CoO. It is also observed that both antidamping and field-like spin-orbit torque efficiencies vary with the capping material in the thickness ranges we examined. Our results reveal the crucial role of interfacial oxides on the perpendicular magnetic anisotropy, magnetic damping, and spin-orbit torques.

Original languageEnglish
Pages (from-to)19414-19421
Number of pages8
JournalACS Applied Materials and Interfaces
Volume13
Issue number16
DOIs
Publication statusPublished - 2021 Apr 28

Keywords

  • Gilbert damping
  • interfacial magnetic oxide
  • magnetic resonance
  • spin-Hall effect
  • spin-orbit torque
  • spintronics

ASJC Scopus subject areas

  • Materials Science(all)

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