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

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4942379· OSTI ID:1371198
 [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
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+.
Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)
Sponsoring Organization:
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)
Grant/Contract Number:
SC0012670
OSTI ID:
1371198
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 8 Vol. 108; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

On the Role of Interfaces on Spin Transport in Magnetic Insulator/Normal Metal Heterostructures journal May 2019
Stress-induced magnetic properties of PLD-grown high-quality ultrathin YIG films journal May 2018
Magnetization reversal in YIG/GGG(111) nanoheterostructures grown by laser molecular beam epitaxy journal January 2017
Synthetic Antiferromagnetic Coupling Between Ultrathin Insulating Garnets journal October 2018
Role of gallium diffusion in the formation of a magnetically dead layer at the Y 3 Fe 5 O 12 / Gd 3 Ga 5 O 12 epitaxial interface journal October 2018
Spin transport parameters of NbN thin films characterized by spin pumping experiments journal January 2019
Role of damping in spin Seebeck effect in yttrium iron garnet thin films journal April 2017
Synthetic antiferromagnetic coupling between ultra-thin insulating garnets text January 2018
Magnetization reversal in YIG/GGG(111) nanoheterostructures grown by laser molecular beam epitaxy text January 2017

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