Abstract
Microwave-assisted magnetization switching (MAS) in an exchange-coupled-composite (ECC) nano-magnet was analyzed based on the macrospin-model. The ECC nano-magnet consists of the perpendicularly magnetized soft and hard magnetic layers which are ferromagnetically coupled with each other through the interlayer exchange coupling, χ. With increasing χ a reentrant transition from the MAS-non-effective state to the MAS-effective state appears. There exists a region of χ where the switching field is reduced by application of the microwave field. The width of this MAS-effective region of χ decreases with an increase of the frequency of the microwave field and vanishes at a certain frequency.
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