The Japan Society of Applied Physics

2023 International Conference on Solid State Devices and Materials

2023 International Conference on Solid State Devices and Materials

Sep 5, 2023 - Oct 31, 2023
Nagoya Congress Center

9:30 AM - 9:45 AM

[B-3-03] High Frequency Spin Torque Oscillation in Orthogonal Magnetization Disks with Strong Biquadratic Magnetic Coupling

○Chuhan Liu1, Yuichiro Kurokawa1, Naoki Hashimoto1, Terumitsu Tanaka1, Hiromi Yuasa1 (1. Kyushu University (Japan))

https://doi.org/10.7567/SSDM.2023.B-3-03

We investigate the spin transfer torque oscillation (STO) in a magnetic orthogonal configuration with a strong biquadratic magnetic coupling to obtain a high and stable STO in both of simulations and experiments. The sample structure consists of a bottom layer with perpendicular magnetic anisotropy (PMA), a spacer providing a biquadratic magnetic coupling, and a top layer with in-plane magnetic anisotropy. The bottom PMA layer is the Co/Pt lamination, the spacer is Cr, and the top layer is Co90Fe10. The spacer Cr is expected to have a large biquadratic magnetic coupling coefficient B12 because the B12 of Co90Fe10/Cr/Co90Fe10 was estimated as -0.6 from the magnetization curves.