Spin torque nano-oscillators with a perpendicular spin polarizer<xref rid="cpb_28_3_037503fn1" ref-type="fn">*</xref><fn id="cpb_28_3_037503fn1"><label>*</label><p>Project supported by the National Basic Research Program of China (Grant No. 2015CB921501) and the National Natural Science Foundation of China (Grant Nos. 11774260, 51671057, and 11874120).</p></fn>

Spin torque nano-oscillators with a perpendicular spin polarizer**

Project supported by the National Basic Research Program of China (Grant No. 2015CB921501) and the National Natural Science Foundation of China (Grant Nos. 11774260, 51671057, and 11874120).

Zheng Cuixiu¹, Chen Hao-Hsau², Zhang Xiangli², Zhang Zongzhi², Liu Yaowen^{1, †}

(a) Schematic of a STNO with an in-plane magnetized free layer M_F and a perpendicular spin polarizer M_P. The positive current J supports the parallel configuration of M_F and M_P, which is defined as the current flowing from the free layer to the polarizer layer. (b) Schematic of STT-driven OP magnetization precession orbit, which is dependent of the applied current direction and amplitude. The blue arrow and black arrow indicate the Slonczewisk’s torque (T_STT) and field-like spin torque (T_FL), respectively. The purple arrow denotes the damping torque. Panels (c) and (d) show the simulated typical magnetization precession and the corresponding oscillation frequency, respectively.