Inertial longitudinal magnetization reversal for non-Heisenberg ferromagnets

TL;DR

This paper presents a theoretical analysis of ultrafast longitudinal spin dynamics in non-Heisenberg ferromagnets, revealing a novel pathway for inertial magnetization reversal driven by ultrashort laser pulses.

Contribution

It introduces a new theoretical framework describing coupled oscillations of magnetization modulus and quadrupolar variables in high-anisotropy ferromagnets, enabling inertial reversal.

Findings

Longitudinal spin dynamics involve coupled oscillations of magnetization and quadrupolar variables.

Ultrashort laser pulses can induce inertial magnetization reversal in simple ferromagnets.

Theoretical pathway for ultrafast control of magnetization states in non-Heisenberg ferromagnets.

Abstract

We analyze theoretically the novel pathway of ultrafast spin dynamics for ferromagnets with high enough single-ion anisotropy (non-Heisenberg ferromagnets). This longitudinal spin dynamics includes the coupled oscillations of the modulus of the magnetization together with the quadrupolar spin variables, which are expressed through quantum expectation values of operators bilinear on the spin components. Even for a simple single-element ferromagnet, such a dynamics can lead to an inertial magnetization reversal under the action of an ultrashort laser pulse.