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Title: Orientation and thickness dependence of magnetization at the interfacesof highly spin-polarized manganite thin films

Abstract

We have probed the nature of magnetism at the surface of (001), (110) and (111)-oriented La{sub 0.7}Sr{sub 0.3}MnO{sub 3} thin films. The spin polarization of La{sub 0.7}Sr{sub 0.3}MnO{sub 3} thin films is not intrinsically suppressed at all surfaces and interfaces but is highly sensitive to both the epitaxial strain state as well as the substrate orientation. Through the use of soft x-ray spectroscopy, the magnetic properties of (001), (110) and (111)-oriented La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/SrTiO{sub 3} interfaces have been investigated and compared to bulk magnetometry and resistivity measurements. The magnetization of (110) and (111)-oriented La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/SrTiO{sub 3} interfaces are more bulk-like as a function of thickness whereas the magnetization at the (001)-oriented La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/SrTiO{sub 3} interface is suppressed significantly below a layer thickness of 20 nm. Such findings are correlated with the biaxial strain state of the La{sub 0.7}Sr{sub 0.3}MnO{sub 3} films; for a given film thickness it is the tetragonal distortion of (001) La{sub 0.7}Sr{sub 0.3}MnO{sub 3} that severely impacts the magnetization, whereas the trigonal distortion for (111)-oriented films and monoclinic distortion for (110)-oriented films have less of an impact. These observations provide evidence that surface magnetization and thus spin polarization depends strongly on themore » crystal surface orientation as well as epitaxial strain.« less

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Advanced Light Source Division; Materials Sciences Division
OSTI Identifier:
951013
Report Number(s):
LBNL-1698E
Journal ID: ISSN 1098-0121; TRN: US0902104
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 79; Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
75; MAGNETIC PROPERTIES; MAGNETISM; MAGNETIZATION; ORIENTATION; POLARIZATION; SPIN; STRAINS; SUBSTRATES; THICKNESS; THIN FILMS; X-RAY SPECTROSCOPY

Citation Formats

Chopdekar, Rajesh V, Arenholz, Elke, and Suzuki, Y. Orientation and thickness dependence of magnetization at the interfacesof highly spin-polarized manganite thin films. United States: N. p., 2008. Web.
Chopdekar, Rajesh V, Arenholz, Elke, & Suzuki, Y. Orientation and thickness dependence of magnetization at the interfacesof highly spin-polarized manganite thin films. United States.
Chopdekar, Rajesh V, Arenholz, Elke, and Suzuki, Y. Mon . "Orientation and thickness dependence of magnetization at the interfacesof highly spin-polarized manganite thin films". United States. https://www.osti.gov/servlets/purl/951013.
@article{osti_951013,
title = {Orientation and thickness dependence of magnetization at the interfacesof highly spin-polarized manganite thin films},
author = {Chopdekar, Rajesh V and Arenholz, Elke and Suzuki, Y},
abstractNote = {We have probed the nature of magnetism at the surface of (001), (110) and (111)-oriented La{sub 0.7}Sr{sub 0.3}MnO{sub 3} thin films. The spin polarization of La{sub 0.7}Sr{sub 0.3}MnO{sub 3} thin films is not intrinsically suppressed at all surfaces and interfaces but is highly sensitive to both the epitaxial strain state as well as the substrate orientation. Through the use of soft x-ray spectroscopy, the magnetic properties of (001), (110) and (111)-oriented La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/SrTiO{sub 3} interfaces have been investigated and compared to bulk magnetometry and resistivity measurements. The magnetization of (110) and (111)-oriented La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/SrTiO{sub 3} interfaces are more bulk-like as a function of thickness whereas the magnetization at the (001)-oriented La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/SrTiO{sub 3} interface is suppressed significantly below a layer thickness of 20 nm. Such findings are correlated with the biaxial strain state of the La{sub 0.7}Sr{sub 0.3}MnO{sub 3} films; for a given film thickness it is the tetragonal distortion of (001) La{sub 0.7}Sr{sub 0.3}MnO{sub 3} that severely impacts the magnetization, whereas the trigonal distortion for (111)-oriented films and monoclinic distortion for (110)-oriented films have less of an impact. These observations provide evidence that surface magnetization and thus spin polarization depends strongly on the crystal surface orientation as well as epitaxial strain.},
doi = {},
journal = {Physical Review B},
issn = {1098-0121},
number = ,
volume = 79,
place = {United States},
year = {2008},
month = {8}
}