s-f(d) exchange mechanism of magnon generation by slow spinpolarons

TL;DR

This paper investigates how magnons are generated by slow spinpolarons in antiferromagnetic semiconductors under strong magnetic fields, highlighting the conditions for magnon emission and estimating the maximum power of generation.

Contribution

It introduces a new mechanism of magnon generation by spinpolarons in antiferromagnetic semiconductors, including the case of dispersionless magnons and the velocity conditions for their emission.

Findings

Magnons are emitted at any small electron velocity in dispersionless cases.

Magnon generation occurs when spinpolaron velocity exceeds magnon phase velocity.

Maximum magnon generation power is estimated.

Abstract

It is shown that in a single-axis antiferromagnetic semiconductor placed in a strong magnetic field, dispersionless magnons start emitting at any arbitrarily small velocity of an electron occurring in a spinpolaron state. If magnons are dispersed they are generated when the spinpolaron velocity exceeds the minimum phase velocity of magnons. The maximum power of magnon generation caused by the drift of spinpolarons is estimated.