An electron spin injection driven, paramagnetic solid-state MASER device

Details An electron spin injection driven, paramagnetic solid-state MASER device An electron spin injection driven, paramagnetic solid-state MASER device

2006-08-04

arxiv.org/abs/cond-mat/0608111v1

Physics

Condensed Matter

Materials Science

To be published Phys. Rev. Lett

Scientific paper

In response to an external, microwave-frequency magnetic field, a paramagnetic medium will absorb energy from the field that drives the magnetization dynamics. Here we describe a new process by which an external spin injection source, when combined with the microwave field spin-pumping, can drive the paramagnetic medium from one that absorbs microwave energy to one that emits microwave energy. We derive a simple condition for the crossover from absorptive to emissive behavior. Based on this process, we propose a spin injection-driven paramagnetic MASER device.

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