Antiferromagnetic nano-oscillator in external magnetic fields

作     者：Jakub Chęciński Marek Frankowski Tomasz Stobiecki 

作者机构：AGH University of Science and Technology Department of Electronics Al. Mickiewicza 30 30-059 Kraków Poland AGH University of Science and Technology Faculty of Physics and Applied Computer Science Al. Mickiewicza 30 30-059 Kraków Poland 

出 版 物：《Physical Review B》 (Phys. Rev. B)

年 卷 期：2017年第96卷第17期

页      面：174438-174438页

核心收录：

基　　金：National Science Center  Poland  (2016/23/B/ST3/01430) 

主　　题：Antiferromagnetism Spin transfer torque Antiferromagnets Landau-Lifschitz-Gilbert equation 

摘      要：We describe the dynamics of an antiferromagnetic nano-oscillator in an external magnetic field of any given time distribution. The oscillator is powered by a spin current originating from spin-orbit effects in a neighboring heavy metal layer and is capable of emitting a THz signal in the presence of an additional easy-plane anisotropy. We derive an analytical formula describing the interaction between such a system and an external field, which can affect the output signal character. Interactions with magnetic pulses of different shapes, with a sinusoidal magnetic field and with a sequence of rapidly changing magnetic fields are discussed. We also perform numerical simulations based on the Landau-Lifshitz-Gilbert equation with spin-transfer torque effects to verify the obtained results and find a very good quantitative agreement between analytical and numerical predictions.