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Title: Determination of rotatable and frozen CoO spins and their relationship to exchange bias in CoO/Fe/Ag(001)

Abstract

The exchange bias of epitaxially grown CoO/Fe/Ag(001) was investigated using X-ray Magnetic Circular Dichroism (XMCD) and X-ray Magnetic Linear Dichroism (XMLD) techniques. A direct XMLD measurement on the CoO layer during the Fe magnetization reversal shows that the CoO compensated spins are rotatable at thinner thickness and frozen, i.e. fixed in direction to the lattice, at larger thickness. By a quantitative determination of the rotatable and frozen CoO spins as a function of the CoO film thickness, we find the remarkable result that the exchange bias is well established before frozen spins are detectable in the CoO film, contrary to the common assumption that the majority of antiferromagnetic spins need to be frozen to generate the exchange bias. We further show that the rotatable/frozen CoO spins are uniformly distributed in the CoO film.

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:
983290
Report Number(s):
LBNL-3440E
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US1004446
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Name: Physical Review Letters; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DICHROISM; MAGNETIC CIRCULAR DICHROISM; MAGNETIZATION; THICKNESS

Citation Formats

Wu, J., Park, J., Kim, W., Arenholz, E., Liberati, M., Scholl, A., Wu, Y., Hwang, C., and Qiu, Z. Determination of rotatable and frozen CoO spins and their relationship to exchange bias in CoO/Fe/Ag(001). United States: N. p., 2010. Web. doi:10.1103/PhysRevLett.104.217204.
Wu, J., Park, J., Kim, W., Arenholz, E., Liberati, M., Scholl, A., Wu, Y., Hwang, C., & Qiu, Z. Determination of rotatable and frozen CoO spins and their relationship to exchange bias in CoO/Fe/Ag(001). United States. doi:10.1103/PhysRevLett.104.217204.
Wu, J., Park, J., Kim, W., Arenholz, E., Liberati, M., Scholl, A., Wu, Y., Hwang, C., and Qiu, Z. Wed . "Determination of rotatable and frozen CoO spins and their relationship to exchange bias in CoO/Fe/Ag(001)". United States. doi:10.1103/PhysRevLett.104.217204. https://www.osti.gov/servlets/purl/983290.
@article{osti_983290,
title = {Determination of rotatable and frozen CoO spins and their relationship to exchange bias in CoO/Fe/Ag(001)},
author = {Wu, J. and Park, J. and Kim, W. and Arenholz, E. and Liberati, M. and Scholl, A. and Wu, Y. and Hwang, C. and Qiu, Z.},
abstractNote = {The exchange bias of epitaxially grown CoO/Fe/Ag(001) was investigated using X-ray Magnetic Circular Dichroism (XMCD) and X-ray Magnetic Linear Dichroism (XMLD) techniques. A direct XMLD measurement on the CoO layer during the Fe magnetization reversal shows that the CoO compensated spins are rotatable at thinner thickness and frozen, i.e. fixed in direction to the lattice, at larger thickness. By a quantitative determination of the rotatable and frozen CoO spins as a function of the CoO film thickness, we find the remarkable result that the exchange bias is well established before frozen spins are detectable in the CoO film, contrary to the common assumption that the majority of antiferromagnetic spins need to be frozen to generate the exchange bias. We further show that the rotatable/frozen CoO spins are uniformly distributed in the CoO film.},
doi = {10.1103/PhysRevLett.104.217204},
journal = {Physical Review Letters},
issn = {0031-9007},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {2}
}