Discontinuous frequency drop in spin torque oscillator with a perpendicularly magnetized FeB free layer

作者：Tsunegi Sumito^*; Taniguchi Tomohiro; Kubota Hitoshi; Imamura Hiroshi; Tamaru Shingo; Konoto Makoto; Yakushiji Kay; Fukushima Akio; Yuasa Shinji

来源：Japanese Journal of Applied Physics, 2014, 53(6): 060307.

DOI：10.7567/JJAP.53.060307

We investigated the low-field oscillation in a spin-torque oscillator (STO) consisting of a perpendicularly magnetized free layer and an in-plane magnetized reference layer. A sharp drop in oscillation frequency at a low magnetic field was observed when the free layer of the STO possessed high perpendicular magnetic anisotropy. In contrast to the results obtained in the past, the investigation performed in this study was consistent with the theoretical predictions in the low-field region. The study presented unveils the oscillation mechanism in the entire field range, which is crucial in designing practical STO devices.

• 出版日期2014-6