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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/5106

Title: New mechanism of linewidth maxima in ferrimagnetic resonance
Authors: Kumar, N.
Sinha, K.P.
Issue Date: 1968
Publisher: American Institute of Physics
Citation: Journal of Applied Physics, 1968, Vol.39, p1073
Abstract: A new mechanism for magnon-phonon relaxation process in ferrimagnetic insulators (e.g., YIG) is proposed which involves direct coupling of the magnons of various spin-wave modes with phonons of the transverse optical modes. This direct interaction emanates from the near-zone magnetic field associated with the transverse optical modes of vibrations in ionic lattices. The dominant part of the interaction term has the form . Hint= -i[ 2; <I>.,+(b.,+~.-h.c.) + 2; tf.'.A(b.'+~A~+a-h.c.)], tTt crt,X where <1>.,+ and tf,'.A are appropriate coupling constants and b •• +, ~A and "'A the phonon-creation and magnon"annihilation operators of the respective branches. These mechanisms lead to a temperaturedependent linewidth of ferrimagnetic resonance exhibiting maxima at certain values of temperature. An order of magnitude agreement with experimental results on YIG is obtained for a reasonable choice of parameters involved. Spin-phonon interaction processes due to transverse optical modes have been shown to playa significant role in the paramagnetic relaxation of some doped ionic crystals.
Description: Restricted Access
URI: http://hdl.handle.net/2289/5106
ISSN: 0021-8979
1089-7550 (Online)
Alternative Location: http://dx.doi.org/10.1063/1.1656167
http://adsabs.harvard.edu/abs/1968JAP....39.1073K
Copyright: 1968 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
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