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Controllable Perpendicular Magnetic Anisotropy in Fe/Fe100−xRhx Heterostructures Probed by Ferromagnetic Resonance

Hiroki Omura1, Sachio Komori1,*, Shigeo Arai2, Kahoru Yoda2, Keiichiro Imura1,3, and Tomoyasu Taniyama1,†

  • 1Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
  • 2Institute of Materials and Systems for Sustainability (IMaSS), Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
  • 3Institute of Liberal Arts and Sciences, Nagoya University, Nagoya 464-8601, Japan

  • *komori.sachio.h0@f.mail.nagoya-u.ac.jp
  • †taniyama.tomo@nagoya-u.jp
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Phys. Rev. Applied 19, 064077 – Published 28 June, 2023

DOI: https://doi.org/10.1103/PhysRevApplied.19.064077

Abstract

A ferromagnetic-antiferromagnetic (FM-AFM) thin-film heterostructure is proposed to be a potential system that can induce perpendicular magnetic anisotropy (PMA) in a ferromagnet, although there are few material combinations available and the underlying mechanism is not sufficiently understood. Here, we demonstrate that the AFM phase of an Fe−Rh ordered alloy induces PMA in an adjacent Fe layer in an Fe/Fe−Rh heterostructure, which manifests itself as an additional mode of ferromagnetic resonance. The induced interfacial PMA disappears following a magnetic phase transition of Fe−Rh from the AFM to the FM state, suggesting that the AFM order is crucial for the stabilization of PMA. The absence of the additional resonance mode in an Fe/Rh/Fe−Rh control sample suggests that the PMA originates from a magnetic exchange coupling at the Fe/Fe−Rh interface. The results are promising for the development of high-density spintronic devices, in which PMA is controllable through the phase transition of Fe−Rh.

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Phys. Rev. Applied 19, 064077– Published 28 June, 2023
  • Received 27 May 2022
  • Revised 4 April 2023
  • Accepted 24 May 2023
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