Theoretical study of microwave-assisted magnetization switching in exchange coupled nano magnets

Microwave-assistedmagnetization switching (MAS) in an exchange-coupled-composite (ECC) nano-magnet wasanalyzed based on the macrospin-model. The ECC nano-magnet consists of the perpendicularlymagnetized soft and hardmagnetic layers which areferromagnetically coupled with each other through the interlayer exchange coupling,χ. With increasingχ a reentrant transition from the MAS-non-effective state to the MAS-effective state appears. There exists a region ofχ where the switching field is reduced by application of themicrowave field. The width of this MAS-effective region ofχ decreases with an increase of the frequency of themicrowave field and vanishes at a certain frequency.
Source: Applied Physics Letters - Category: Physics Authors: Source Type: research