Magnetism and microstructure of co-deposited yttrium iron garnet-barium titanate films
Name
231604_1_online.pdf
Description
Published version
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8.36 MB
Format
Adobe PDF
Checksum (MD5)
e627d38d0d0763ca5abfcdef27f394fe
Author(s)
Su, Tingyu
Ross, Caroline A
Date Issued
December 7, 2022
Journal
Applied Physics Letters
Publisher
AIP Publishing
Citation
Tingyu Su, Caroline A. Ross; Magnetism and microstructure of co-deposited yttrium iron garnet-barium titanate films. Appl. Phys. Lett. 5 December 2022; 121 (23): 231604.
Version
Final published version
Abstract
Yttrium iron garnet (YIG) and barium titanate (BTO) were co-deposited on (001)-orientated gadolinium gallium garnet substrates by pulsed laser deposition with composition determined by the ratio of laser shots ablating each target. With increasing shot ratios of YIG/BTO = 2.5/1, 4/1, 20/1, and 30/1, the majority phase in the film changes from textured polycrystalline perovskite to epitaxial garnet. Cross-sectional STEM characterization of the YIG-rich films reveals three distinct sublayers: the bottom layer is a coherent epitaxial garnet layer with higher unit cell volume than that of YIG; the second layer is garnet exhibiting crystalline defects and misorientation; and the upper layer is amorphous. Highly defective regions within the second layer are richer in Ba, suggesting that the microstructure is promoted by the insolubility of Ba in YIG. Temperature-dependent magnetization measurements fitted to a super-exchange dilution model indicate the presence of nonmagnetic Ti and vacancies in both octahedral and tetrahedral sites.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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DOI of Published Version
https://doi.org/10.1063/5.0128306
