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Title: Interface effects in nanometer-thick yttrium iron garnet films studied by magneto-optical spectroscopy

Abstract

The properties of nanometer-thick yttrium iron garnet (YIG) films are strongly influenced by interfaces. This work employs spectral ellipsometry (SE) and magneto-optic polar Kerr rotation (PKR) to characterize YIG films with thickness, t, from 6 nm to 30 nm grown on Gd 3Ga 5O 12 (GGG) substrates oriented parallel to (111) plane. The films display a surface roughness of 0.35 nm or lower. The analysis of the SE data at the photon energies of 1 eV < E < 6.5 eV provided the t and permittivity values. The PKR at 1.3 eV < E < 4.5 eV is reasonably explained with the optical model for the YIG film/GGG substrate system. Even better agreement is achieved by assuming a 1.07-nm-thick layer sandwiched between YIG and GGG that has Fe 3+ sublattice magnetization opposite to that in the YIG volume. This suggests the existence of antiferromagnetic coupling between the Gd 3+ and tetrahedral Fe 3+.

Authors:
 [1];  [1];  [2];  [2]
  1. Charles Univ., Prague (Czech Republic). Faculty of Mathematics and Physics
  2. Colorado State Univ., Fort Collins, CO (United States). Dept. of Physics
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Czech Science Foundation; National Science Foundation (NSF); US Army Research Office (ARO); Defense Advanced Research Projects Agency (DARPA)
OSTI Identifier:
1371198
Grant/Contract Number:  
SC0012670
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 8; Related Information: SHINES partners with University of California, Riverside (lead); Arizona State University; Colorado State University; Johns Hopkins University; University of California Irvine; University of California Los Angeles; University of Texas at Austin; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; phonons; thermal conductivity; thermoelectric; spin dynamics; spintronics

Citation Formats

Jakubisova, Eva Liskova, Visnovsky, Stefan, Chang, Houchen, and Wu, Mingzhong. Interface effects in nanometer-thick yttrium iron garnet films studied by magneto-optical spectroscopy. United States: N. p., 2016. Web. doi:10.1063/1.4942379.
Jakubisova, Eva Liskova, Visnovsky, Stefan, Chang, Houchen, & Wu, Mingzhong. Interface effects in nanometer-thick yttrium iron garnet films studied by magneto-optical spectroscopy. United States. doi:10.1063/1.4942379.
Jakubisova, Eva Liskova, Visnovsky, Stefan, Chang, Houchen, and Wu, Mingzhong. Tue . "Interface effects in nanometer-thick yttrium iron garnet films studied by magneto-optical spectroscopy". United States. doi:10.1063/1.4942379. https://www.osti.gov/servlets/purl/1371198.
@article{osti_1371198,
title = {Interface effects in nanometer-thick yttrium iron garnet films studied by magneto-optical spectroscopy},
author = {Jakubisova, Eva Liskova and Visnovsky, Stefan and Chang, Houchen and Wu, Mingzhong},
abstractNote = {The properties of nanometer-thick yttrium iron garnet (YIG) films are strongly influenced by interfaces. This work employs spectral ellipsometry (SE) and magneto-optic polar Kerr rotation (PKR) to characterize YIG films with thickness, t, from 6 nm to 30 nm grown on Gd3Ga5O12 (GGG) substrates oriented parallel to (111) plane. The films display a surface roughness of 0.35 nm or lower. The analysis of the SE data at the photon energies of 1 eV < E < 6.5 eV provided the t and permittivity values. The PKR at 1.3 eV < E < 4.5 eV is reasonably explained with the optical model for the YIG film/GGG substrate system. Even better agreement is achieved by assuming a 1.07-nm-thick layer sandwiched between YIG and GGG that has Fe3+ sublattice magnetization opposite to that in the YIG volume. This suggests the existence of antiferromagnetic coupling between the Gd3+ and tetrahedral Fe3+.},
doi = {10.1063/1.4942379},
journal = {Applied Physics Letters},
number = 8,
volume = 108,
place = {United States},
year = {2016},
month = {2}
}

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Cited by: 14 works
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