Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
Antiferromagnetic Resonance and Spin-Wave Instabilities at Spin-Flop Critical Field in (C2H5NH3)2CuCl4
Jun ShiHitoshi YamazakiMichinobu Mino
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1988 Volume 57 Issue 10 Pages 3580-3586

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Abstract

Antiferromagnetic resonance and parametric excitation of spin-waves at spin-flop critical field in (C2H5NH3)2CuCl4 are studied by perpendicular-pumping technique. Nonlinear absorption which is attributed to the first-order Suhl instability is observed at twice the frequency of the spin-flop critical field resonance. Power dependence of the imaginary part of the susceptibility, χ″, shows the existence of the second threshold which indicates unstable growth of second group of magnon modes.

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