Department of Physics Papers

Document Type

Journal Article

Date of this Version

3-1966

Publication Source

Physical Review

Volume

143

Issue

2

Start Page

353

Last Page

355

DOI

10.1103/PhysRev.143.353

Abstract

The effect of dipolar interactions on the spin-wave spectrum of a cubic antiferromagnet is studied. The spin-wave spectrum is found to consist of two branches whose frequencies are

(ℏω)2=(gβ)2[HA+HEa2k2][HA+HE(2−a2k2)−8πM/3+8πM sin2k]

and

(ℏω)2=(gβ)2[HA+HEa2k2][HA+HE(2−a2k2)−8πM/3].

Here a is the lattice constant, M the magnetic moment per unit volume, k the wave vector, θk the angle between the magnetization and the wave vector, and HA and HE the anisotropy and exchange fields. The reasons for discrepancies between these formulas and those given previously by other authors are discussed.

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Date Posted: 12 August 2015

This document has been peer reviewed.