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

TL;DR

This paper introduces a novel spin injection-driven paramagnetic MASER device that converts microwave absorption into emission, supported by a theoretical condition for this transition.

Contribution

It presents a new mechanism combining spin injection and microwave spin-pumping to enable microwave emission in paramagnetic media, a significant advancement over traditional methods.

Findings

Derived a simple condition for the absorption-emission crossover.

Proposed a new spin injection-driven MASER device.

Theoretical foundation for microwave emission in paramagnetic media.

Abstract

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.