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Title: Temperature-dependent Brillouin light scattering spectra of magnons in yttrium iron garnet and permalloy

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1373325
Grant/Contract Number:
SC0012670
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 2; Related Information: CHORUS Timestamp: 2017-07-28 22:09:06; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Olsson, Kevin S., An, Kyongmo, Ma, Xin, Sullivan, Sean, Venu, Vijay, Tsoi, Maxim, Zhou, Jianshi, Shi, Li, and Li, Xiaoqin. Temperature-dependent Brillouin light scattering spectra of magnons in yttrium iron garnet and permalloy. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.024448.
Olsson, Kevin S., An, Kyongmo, Ma, Xin, Sullivan, Sean, Venu, Vijay, Tsoi, Maxim, Zhou, Jianshi, Shi, Li, & Li, Xiaoqin. Temperature-dependent Brillouin light scattering spectra of magnons in yttrium iron garnet and permalloy. United States. doi:10.1103/PhysRevB.96.024448.
Olsson, Kevin S., An, Kyongmo, Ma, Xin, Sullivan, Sean, Venu, Vijay, Tsoi, Maxim, Zhou, Jianshi, Shi, Li, and Li, Xiaoqin. 2017. "Temperature-dependent Brillouin light scattering spectra of magnons in yttrium iron garnet and permalloy". United States. doi:10.1103/PhysRevB.96.024448.
@article{osti_1373325,
title = {Temperature-dependent Brillouin light scattering spectra of magnons in yttrium iron garnet and permalloy},
author = {Olsson, Kevin S. and An, Kyongmo and Ma, Xin and Sullivan, Sean and Venu, Vijay and Tsoi, Maxim and Zhou, Jianshi and Shi, Li and Li, Xiaoqin},
abstractNote = {},
doi = {10.1103/PhysRevB.96.024448},
journal = {Physical Review B},
number = 2,
volume = 96,
place = {United States},
year = 2017,
month = 7
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on July 28, 2018
Publisher's Accepted Manuscript

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  • Using the space-resolved Brillouin light scattering spectroscopy we study the transformation of dynamic magnetization patterns in a bilayer multiferroic structure. We show that in the comparison with a single yttrium iron garnet (YIG) film magnetization distribution is transformed in the bilayer structure due to the coupling of waves propagating both in an YIG film (magnetic layer) and in a barium strontium titanate slab (ferroelectric layer). We present a simple electrodynamic model using the numerical finite element method to show the transformation of eigenmode spectrum of confined multiferroic. In particular, we demonstrate that the control over the dynamic magnetization and themore » transformation of spatial profiles of transverse modes in magnetic film of the bilayer structure can be performed by the tuning of the wavevectors of transverse modes. The studied confined multiferroic stripe can be utilized for fabrication of integrated dual tunable functional devices for magnonic applications.« less
  • Certain samples of polycrystalline yttrium--iron garnet are characterized by a room-temperature permesbility spectrum having two regions of dispersion, one at nmicrowaves, the other at rf frequency. The former dispersion is identified as gyromagnetic in origin. The rf dispersion, which exhibits a temperature-activated shift to lower frequency with decreasing temperature, appears due to an electron-diffusion controlled domnin-wall relaxation. The activation energy for the process is 0.38 ev.
  • The measurement of the temperature dependence of the magnetization, M/sub s/, between 4.2 and 300 K of epitaxial films of Y/sup 3+//sub 3-//sub x/Ca/sup 2+//sub x/Fe/sup 3+//sub 5-//sub y//sub -//sub x//sub '/ Ga/sup 3+//sub y/Fe/sup 4+//sub x//sub '/O/sup 2-//sub 12/, with x<0.4 and 0less than or equal toy<1.6, has shown low-temperature deviations from the molecular field theory of a two-sublattice Neel model, generally applicable to yttrium iron garnet with nonmagnetic substitutions. Molecular field calculations of M(x,y,T) have been performed, assuming a temperature-dependent concentration of Fe/sup 4 +/ ions due to the gradual localization of the uncompensated hole at the tetrahedralmore » Fe/sup 3 +/ sites with the lowering of the temperature. The Fe/sup 4 +/ ions are assumed to form a third magnetic sublattice, which is ferromagnetically coupled to the octahedral Fe/sup 3 +/. The hole localization energy is observed to be on the order of 1--4 meV. The calculations are in good agreement with the experimental results.« less
  • The magnetodynamical properties of nanometer-thick yttrium iron garnet films are studied using ferromagnetic resonance as a function of temperature. The films were grown on gadolinium gallium garnet substrates by pulsed laser deposition. First, we found that the damping coefficient increases as the temperature increases for different film thicknesses. Second, we found two different dependencies of the damping on film thickness: at room temperature, the damping coefficient increases as the film thickness decreases, while at T = 8 K, we find the damping to depend only weakly on the thickness. We attribute this behavior to an enhancement of the relaxation of the magnetization bymore » impurities or defects at the surfaces.« less
  • Electrons, optical phonons, and acoustic phonons are often driven out of local equilibrium in electronic devices or during laser-material interaction processes. The need for a better understanding of such non-equilibrium transport processes has motivated the development of Raman spectroscopy as a local temperature sensor of optical phonons and intermediate frequency acoustic phonons, whereas Brillouin light scattering (BLS) has recently been explored as a temperature sensor of low-frequency acoustic phonons. Here, we report the measured BLS spectra of silicon at different temperatures. The origins of the observed temperature dependence of the BLS peak position, linewidth, and intensity are examined in ordermore » to evaluate their potential use as temperature sensors for acoustic phonons.« less