Non-Gilbert-damping Mechanism in a Ferromagnetic Heusler Compound Probed by Nonlinear Spin Dynamics

The nonlinear decay of propagating spin waves in the low-Gilbert-damping Heusler film Co_{2}Mn_{0.6}Fe_{0.4}Si is reported. Here, two initial magnons with frequency f_{0} scatter into two secondary magnons with frequencies f_{1} and f_{2}. The most remarkable observation is that f_{1} stays fixed if...

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Bibliographic Details
Published in:Physical review letters 2014-11, Vol.113 (22), p.227601-227601, Article 227601
Main Authors: Pirro, P, Sebastian, T, Brächer, T, Serga, A A, Kubota, T, Naganuma, H, Oogane, M, Ando, Y, Hillebrands, B
Format: Article
Language:English
Subjects:
Damping
Ferromagnetism
Instability
Magnons
Nonlinearity
Spin dynamics
Spin waves
Wave propagation
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Summary:The nonlinear decay of propagating spin waves in the low-Gilbert-damping Heusler film Co_{2}Mn_{0.6}Fe_{0.4}Si is reported. Here, two initial magnons with frequency f_{0} scatter into two secondary magnons with frequencies f_{1} and f_{2}. The most remarkable observation is that f_{1} stays fixed if f_{0} is changed. This indicates, that the f_{1} magnon mode has the lowest instability threshold, which, however, cannot be understood if only Gilbert damping is present. We show that the observed behavior is caused by interaction of the magnon modes f_{1} and f_{2} with the thermal magnon bath. This evidences a significant contribution of the intrinsic magnon-magnon scattering mechanisms to the magnetic damping in high-quality Heusler compounds.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.113.227601