Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
69 (1991), S. 1569-1573
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Subsidiary absorption butterfly curves of spin-wave instability threshold versus static in-plane field have been obtained for yttrium iron garnet (YIG) thin films at 3 GHz. The butterfly curves have been found to be rather anomalous, typically displaying a pronounced dip and a very low minimum threshold. These anomalous features are attributed to the overlap of the subsidiary absorption field region with ferromagnetic resonance (FMR). First-order instability theory was extended to include the uniform mode response near FMR. The extended theory yields good fits to the data for reasonable values of the YIG FMR linewidths. The theoretical analysis also shows a predicted flip in the azimuthal propagation angle φk for the unstable spin waves in the region of FMR overlap. With increasing field, there are predicted discontinuous changes in φk from 90° to 0° and back to 90° in the region of FMR.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.347251
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