Magnon trap by chiral spin pumping

Abstract

Chiral spin pumping is the generation of unidirectional spin current in half of ferromagnetic films, conductors, or microwave waveguides by dynamic dipolar stray fields from close-by nanomagnets. Here, the authors predict that a second nanomagnet on the same film can perfectly absorb the spin and energy emitted by the first magnet, leading to unique functionalities, such as trapping, amplification, and valve/transistor action. They show the perfect energy transfer is universal for chirally coupled system including, e.g., magnons and microwave photons.

Topics & Concepts