Spin dynamics from a constrained magnetic Tight-Binding model

TL;DR

This paper introduces a constrained magnetic tight-binding model to simulate spin dynamics, capturing the precession of atomic moments efficiently and aligning with classical spin dynamics results for Fe, Co, and Ni clusters.

Contribution

It presents a novel approach integrating an angular penalty functional into the tight-binding model to accurately simulate magnetic moment precession.

Findings

Effective atomic magnetic fields are consistent with Heisenberg exchange.

Precession dynamics occur faster than magnitude variations.

Model successfully reproduces classical spin dynamics results.

Abstract

A dynamics of the precession of coupled atomic moments in the tight-binding (TB) approximation is presented. By implementing an angular penalty functional in the energy that captures the magnetic effective fields self-consistently, the motion of the orientation of the local magnetic moments is observed faster than the variation of their magnitudes. This allows the computation of the effective atomic magnetic fields that are found consistent with the Heisenberg's exchange interaction, by comparison with classical atomistic spin dynamics on Fe, Co and Ni magnetic clusters.