Stable microwave-assisted magnetization switching for nanoscale exchange-coupled composite grain

Tanaka, Terumitsu; Kashiwagi, Shota; Furomoto, Yoshitoki; Otsuka, Yuto; Matsuyama, Kimihide
December 2013
Nanoscale Research Letters;Dec2013, Vol. 8 Issue 1, p1
Academic Journal
Magnetization mechanisms of nanoscale magnetic grains greatly differ from well-known magnetization mechanisms of micrometer- or millimeter-sized magnetic grains or particles. Magnetization switching mechanisms of nanoscale exchange-coupled composite (ECC) grain in a microwave field was studied using micromagnetic simulation. Magnetization switching involving a strongly damped or precessional oscillation was studied using various strengths of external direct current and microwave fields. These studies imply that the switching behavior of microwave-assisted magnetization switching of the ECC grain can be divided into two groups: stable and unstable regions, similar to the case of the Stoner-Wahlfarth grain. A significant reduction in the switching field was observed in the ECC grain when the magnetization switching involved precessional oscillations similar to the case of the Stoner-Wohlfarth grain. This switching behavior is preferred for the practical applications of microwave-assisted magnetization switching.


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