Relaxation in Antiferromagnets due to Spin‐Wave Interactions
作者： A. Brooks Harris
DOI: 10.1063/1.1708364
关键词:
摘要: For an antiferromagnet it is shown that within perturbation theory the Holstein‐Primakoff and Dyson‐Maleev transformations do not lead to identical results for either static or dynamic properties. By examining spin Green's functions we justify use of transformation when there are few waves present. Using second‐order find antiferromagnetic resonance linewidth be Δω0=(64ωAω0/π3S2ωE)(kT/ℏωE)2exp(−ℏω0/kT) for kT≪ℏω0 Δω0=[40ωAζ(3)/π3S2](kT/ℏωE)3 for ℏω0≪kT≪ℏωE, in qualitative agreement with experimental MnF2.
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