Magnetization spin dynamics in a (LuBi)(3)Fe5O12 (BLIG) epitaxial film

Bismuth substituted lutetium iron garnet (BLIG) films exhibit larger Faraday rotation, and have a higher Curie temperature than yttrium iron garnet. We have observed magnetic stripe domains and measured domain widths of 1.4 μm using Fourier domain polarization microscopy, Faraday rotation experiment...

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Bibliographic Details
Main Authors: M. Malathi, Guru Venkat, A. Arora, I.I. Syvorotka, V. Sivasubramanian, A. Prabhakar
Format: Default Conference proceeding
Published: 2017
Subjects:
Mechanical engineering not elsewhere classified
Condensed matter physics not elsewhere classified
Other physical sciences not elsewhere classified
Magnetization dynamics
Multi domain micro-magnetic simulations
Brillouin light scattering
Spin waves
Faraday rotation
Mechanical Engineering
Physical Sciences not elsewhere classified
Condensed Matter Physics
Online Access:https://hdl.handle.net/2134/37323
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Summary:Bismuth substituted lutetium iron garnet (BLIG) films exhibit larger Faraday rotation, and have a higher Curie temperature than yttrium iron garnet. We have observed magnetic stripe domains and measured domain widths of 1.4 μm using Fourier domain polarization microscopy, Faraday rotation experiments yield a coercive field of 5 Oe. These characterizations form the basis of micromagnetic simulations that allow us to estimate and compare spin wave excitations in BLIG films. We observed that these films support thermal magnons with a precessional frequency of 7 GHz with a line width of 400 MHz. Further, we studied the dependence of precessional frequency on the externally applied magnetic field. Brillouin light scattering experiments and precession frequencies predicted by simulations show similar trend with increasing field.

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