Contributions of interfacial spin–orbit coupling to magnetic and spintronic properties in AuPt/ferromagnet bilayers

• Published in: Applied physics letters Vol. 125; no. 7
• Main Authors: Yun, Deok Hyun, Han, Ki-Hyuk, Nah, Young-Jun, Kim, YongJin, Jang, Seung-Hun, Kang, Min-Gu, Shin, Sang-Ho, Min, Byoung-Chul, Koo, Hyun Cheol, Ju, Byeong-Kwon, Lee, OukJae
• Format: Journal Article
• Language: English
• Published: Melville American Institute of Physics 12.08.2024
• Subjects: Data processing; Ferromagnetism; Inhomogeneity; Magnetic damping; Magnetic properties; Magnetoelastic effect; Magnons; Spin-orbit interactions
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/5.0216571

We investigate the relationships between various magnetic and spintronic properties within AuPt/ferromagnet (FM) bilayers (FM = CoFe, CoFeB, Py, and Co). A linear correlation between the volume and surface magnetic anisotropies is identified, potentially influenced by the magnetoelastic effect. The FM thickness dependence of the magnetic damping indicates that spin-memory loss due to the interfacial spin–orbit coupling (ISOC) and spin pumping to the heavy-metal layer contribute little to the damping. Instead, a notable contribution from two magnon scattering to the damping is recognized in AuPt/(Co, CoFe, CoFeB) bilayers, possibly originating from a magnetic inhomogeneity due to the ISOC. In addition, in contrast to the magnetic damping, spin–orbit-torque efficiencies are unlikely related to the ISOC in AuPt/FM systems. This work offers valuable insights into the correlations among magnetic and spintronic parameters arising from the interfaces, ultimately aiding in the advancement of magnetic memory and information processing systems.