Magnetic anisotropy manipulation and interfacial coupling in Sm 3 Fe 5 O 12 films and CoFe/Sm 3 Fe 5 O 12 heterostructures

• Published in: Chinese physics B 2021-12, Vol.30 (12), p.127502
• Main Authors: Shen, Lei, Wu, Guanjie, Sun, Tao, Meng, Zhi, Zhou, Chun, Liu, Wenyi, Qiu, Kang, Ma, Zongwei, Huang, Haoliang, Lu, Yalin, Zhang, Zongzhi, Sheng, Zhigao
• Format: Article
• Language: English
• ISSN: 1674-1056
• DOI: 10.1088/1674-1056/ac0040

The magnetic anisotropy manipulation in the Sm 3 Fe 5 O 12 (SmIG) films and its effect on the interfacial spin coupling in the CoFe/SmIG heterostructures were studied carefully. By switching the orientation of the Gd 3 Ga 5 O 12 substrates from (111) to (001), the magnetic anisotropy of obtained SmIG films shifts from in-plane to out-of-plane. Similar results can also be obtained in the films on Gd 3 Sc 2 Ga 3 O 12 substrates, which identifies the universality of such orientation-induced magnetic anisotropy switching. Additionally, the interfacial spin coupling and magnetic anisotropy switching effect on the spin wave in CoFe/SmIG magnetic heterojunctions have also been explored by utilizing the time-resolved magneto–optical Kerr effect technique. It is intriguing to find that both the frequency and effective damping factor of spin precession in CoFe/SmIG heterojunctions can be manipulated by the magnetic anisotropy switching of SmIG films. These findings not only provide a route for the perpendicular magnetic anisotropy acquisition but also give a further path for spin manipulation in magnetic films and heterojunctions.