2022 International Conference on Solid State Devices and Materials

Presentation information

Oral Presentation

09: Novel Functional / Quantum / Spintronic Devices and Materials

[C-10] Spintronics II

Thu. Sep 29, 2022 4:00 PM - 5:30 PM 103 (1F)

Session Chair: Ken-ichi Aoshima (NHK STRL), Ken Morita (Chiba Univ.)

4:30 PM - 4:45 PM

[C-10-03] THz Ferrimagnetic Oscillation Based on the Atomistic Model

〇Xue Zhang1, Baofang Cai2, Jie Ren1, Zhengping Yuan1, Yumeng Yang1, Gengchiau Liang2, Zhifeng Zhu1 (1. Univ.of ShanghaiTech (China), 2. National Univ.of Singapore (Singapore))

Presentation style: Online

https://doi.org/10.7567/SSDM.2022.C-10-03

The magnetization oscillation of ferrimagnets, (FeCo)1-xGdx, driven by the spin transfer torque is studied using the two-dimensional atomistic model. Two oscillation modes are observed, i.e., the exchange mode and the flipped exchange mode, where the former only exists at small Gd composition. The frequency ranges from 300 GHz to 4.3 THz, and it can be controlled in a wide current range from 3×10^11 A/m^2 to 1.9×10^12 A/m^2. The high frequency is mainly occurred in the flipped exchange mode. The frequency increases when the Gd composition is increased. A spatial nonuniform oscillation is also observed when the sample is small. The effect of the Gd composition and the sample size cannot be captured using the macrospin model. Our study helps to understand the THz oscillation generated in ferrimagnets.

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