Exchange enhanced anisotropy in ferromagnetic/antiferromagnetic multilayers: dynamic consequences

TL;DR

This paper explores how exchange coupling in ferromagnetic/antiferromagnetic multilayers influences dynamic magnetic behaviors, revealing effects near the antiferromagnet's ordering temperature that impact domain wall motion and switching.

Contribution

It introduces the concept that exchange susceptibility leads to dynamic effects in multilayers, extending understanding beyond static magnetic properties.

Findings

Dynamic effects appear near the antiferromagnet's ordering temperature.

Exchange susceptibility influences domain wall velocities and resonances.

Precessional switching behaviors are affected by exchange interactions.

Abstract

The phenomena of exchange anisotropy is well known in terms of static magnetization properties such as enhanced coercivity and magnetization loop shifts. These effects are primarily associated with effective anisotropies introduced into the ferromagnet by exchange coupling with a strongly anisotropic antiferromagnet. These effective anisotropies can be understood as manifestations of a more fundamental exchange induced susceptibility. We show that a consequence of this view is that a class of unusual dynamic effects associated with the exchange susceptibility should also exist. The effects become apparent near the ordering temperature of the antiferromagnet and affect domain wall velocities, domain wall resonances, and precessional switching of the ferromagnet.