Asymmetry of the lineshape in one-magnon Raman scattering from FeF<sub>2</sub>

Smith, Stephen R.; Cottam, M. G.; Ariai, J.; Coule, D H

doi:10.1088/0022-3719/16/23/028

Cited by 2 publications

(2 citation statements)

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“…By contrast, in the spin disorder mechanism the magnon scatters off a thermal disorder in a longitudinal spin component, so it becomes important at higher temperatures. Experimental evidence mentioned earlier for the spin disorder damping mechanism includes studies in the exchange-dominated regimes for the bulk ferromagnet EuO [31] by neutron scattering and for the bulk antiferromagnet FeF 2 [32][33][34] by Raman scattering.…”

Section: Discussionmentioning

confidence: 99%

“…In comparing previous theory with experiment for bulk materials, the spin disorder damping mechanism has been successful in explaining, for example, the neutron scattering linewidths for EuO [31] and the characteristically asymmetric broadened lineshapes for Raman scattering from FeF 2 [32][33][34]. Other linewidth and lineshape data have recently been reviewed in [6].…”

Section: Introductionmentioning

confidence: 99%

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Damping of dipole-exchange spin waves in ferromagnetic thin films at elevated temperatures

Cottam¹,

Haghshenasfard²

2021

J. Phys.: Condens. Matter

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A non-bosonic technique, based on the drone-fermion perturbation method and a high-density expansion, is employed to study the spin-wave (SW) scattering processes in a ferromagnetic thin film with exchange and dipole-dipole interactions. Specifically, the diagrammatic contributions to the spin-spin Green's functions are evaluated within a 1/z perturbation expansion, where z is the number of spins interacting with any given spin. The results are used to calculate the SW damping at temperatures below the Curie temperature T C . It is found that, apart from the usual contributions due to three-magnon and four-magnon processes in the film, which are dominant at relatively low temperatures (consistent with boson expansion methods), there is an additional mechanism that becomes important for temperatures above about 1 2 T C This is spin disorder damping, previously studied in bulk magnetic materials; it occurs when a spin wave is scattered by the instantaneous disorder produced when a longitudinal spin component undergoes a large thermal fluctuation. Numerical estimates are presented for thin films of Permalloy and EuO.

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