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The bilayer structures consisting of Mn3PtN (5 nm)/CoFeB(3 nm) and Mn3Pt(5 nm)/CoFeB(3 nm) were fabricated via magnetron sputtering to investigate the role of nitrogen on charge-to-spin conversion efficiency in the noncollinear antiferromagnets (AFMs). The crystal structure of Mn3PtN (MPN) without N is consistent with that of Mn3Pt (MP) with L12-ordered structure, which allows us to study the different charge-to-spin conversion efficiency for AFMs with and without N. The spin-torque ferromagnetic resonance and second-harmonic Hall measurements were performed for both samples. It was revealed that the spin Hall angle (θSH) of the MPN with spin polarization in the y direction was observed to be ∼0.033, exceeding the corresponding value of MP (∼0.025), which was qualitatively supported by the first-principles calculation. These results led us to conclude that N plays a crucial role in stabilizing the noncolliear antiferromagnetic structure and creating an electronic state advantage for the enhanced θSH.

権利情報:

• In Copyright
  ©2024 American Physical Society

キーワード: Nitride, Charge-spin conversion, Antiferromagnet

刊行年月日: 2024-06-04

出版者: American Physical Society (APS)

掲載誌:

• Physical Review B (ISSN: 1550235X) vol. 109 issue. 22 224406

研究助成金:

• Tohoku University
• Department of Science and Technology, Ministry of Science and Technology, India
• Indian Institute of Technology (BHU) Varanasi
• Japan Society for the Promotion of Science 23K22803

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4717

公開URL: https://doi.org/10.1103/physrevb.109.224406

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更新時刻: 2024-09-02 12:30:22 +0900

MDRでの公開時刻: 2024-09-02 12:30:22 +0900