Spin Wave Frequency and Critical Dynamics of Ferromagnets Below T_C
H. Schinz, and F. Schwabl
TL;DR
This paper uses mode-coupling theory to demonstrate the universality of spin wave frequency scaling in ferromagnets below T_C, aligning theoretical predictions with experimental data for various materials.
Contribution
It introduces a universal scaling function for spin wave frequencies in isotropic Heisenberg ferromagnets and validates it against experimental results.
Findings
Universal spin wave frequency scaling function established
Theoretical and experimental data for Fe, Ni, Co, EuO, EuS show good agreement
Recent Ni measurements of line width are quantitatively explained
Abstract
Employing mode-coupling theory we show that the amplitude of the spin wave frequency scaling function for the isotropic Heisenberg Hamiltonian is universal. Theoretical and experimental values for Fe, Ni, Co, EuO, and EuS agree quite well. Recent measurements of the longitudinal line width in Ni are explained quantitatively.
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