Spin wave-assisted reduction in switching field ofhighly coercive iron-platinum magnets

摘要

Recent rapid progress in spintronic and magnetic storage nanodevices has required nanomagnetsto balance competing goals for high coercive field and low switching field. However,a decisive route for highly efficient magnetization switching has not been established yet.Here we propose a novel switching method using a spin wave of magnetic structures twistedin a nanometre scale. We have experimentally demonstrated extremely low field-magnetizationswitching in a highly coercive FePt by using a spin wave excited in a soft magneticpermalloy (Ni81Fe19), where permalloy is exchange-coupled to FePt through the interface. Wecan tune the switching field by varying the magnitude and frequency of the radio frequencymagnetic field, and a significant decrease in switching field by one order of magnitude isachieved under the optimum conditions. The spin wave-assisted magnetization switching is apromising technique for ultralow-energy magnetization manipulation.