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Title: Symmetry-breaking induced exchange bias in ferromagnetic Ni/Cu/Coand Ni/Fe/Co sandwiches grown on vicinal Cu(001) surface

Abstract

No abstract prepared.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
COLLABORATION - Department of Physics,University of California at Berkeley, Berkeley, California 94720,USA
OSTI Identifier:
932977
Report Number(s):
LBNL-63436
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US200814%%66
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 99; Related Information: Journal Publication Date: 2007
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SYMMETRY BREAKING; FERROMAGNETIC MATERIALS; NICKEL; COPPER; COBALT; IRON; SUBSTRATES; CRYSTAL GROWTH; advanced light source als

Citation Formats

Won, C., Wu, Y.Z., Arenholz, E., Choi, J., Wu, J., and Qiu, Z.Q. Symmetry-breaking induced exchange bias in ferromagnetic Ni/Cu/Coand Ni/Fe/Co sandwiches grown on vicinal Cu(001) surface. United States: N. p., 2007. Web. doi:10.1103/PhysRevLett.99.077203.
Won, C., Wu, Y.Z., Arenholz, E., Choi, J., Wu, J., & Qiu, Z.Q. Symmetry-breaking induced exchange bias in ferromagnetic Ni/Cu/Coand Ni/Fe/Co sandwiches grown on vicinal Cu(001) surface. United States. doi:10.1103/PhysRevLett.99.077203.
Won, C., Wu, Y.Z., Arenholz, E., Choi, J., Wu, J., and Qiu, Z.Q. Wed . "Symmetry-breaking induced exchange bias in ferromagnetic Ni/Cu/Coand Ni/Fe/Co sandwiches grown on vicinal Cu(001) surface". United States. doi:10.1103/PhysRevLett.99.077203.
@article{osti_932977,
title = {Symmetry-breaking induced exchange bias in ferromagnetic Ni/Cu/Coand Ni/Fe/Co sandwiches grown on vicinal Cu(001) surface},
author = {Won, C. and Wu, Y.Z. and Arenholz, E. and Choi, J. and Wu, J. and Qiu, Z.Q.},
abstractNote = {No abstract prepared.},
doi = {10.1103/PhysRevLett.99.077203},
journal = {Physical Review Letters},
number = ,
volume = 99,
place = {United States},
year = {Wed Mar 07 00:00:00 EST 2007},
month = {Wed Mar 07 00:00:00 EST 2007}
}
  • Ultrathin Ni films are grown on stepped Cu(001) in 0 degree sign -10 degree sign range of the vicinal angle. Spin-reorientation transition (SRT) of these films is studied in situ using surface magneto-optical Kerr effect. The SRT thickness is invariant up to 7 degree sign vicinal angle. Adsorption of submonolayer Co at the Ni step edges, however, increases significantly the SRT thickness. The results are quantitatively reproduced by a simple phenomenological model considering the presence of step-induced anisotropy. (c) 2000 The American Physical Society.
  • Enhancement of exchange bias induced at the interface of the antiferromagnetic (AF)/ferromagnetic (F) layers was studied using the bottom {open_quotes}spin-valve films{close_quotes} (SVs) with the Mn{endash}Ir/Co{endash}Fe exchange coupled films. Exchange bias increased using an ultrathin Cu underlayer. Meanwhile, both exchange bias field, H{sub ex}, and blocking temperature, T{sub B}, increased intensively by heating specimens after depositing Mn{endash}Ir film in a high vacuum. These two enhancement effects worked in an additive. As a result, an unidirectional anisotropy constant, J{sub K}, of 0.39 erg/cm2 (H{sub ex} of 1.3 kOe) and T{sub B} of {similar_to}325{degree}C were obtained for the bottom SVs with a totalmore » thickness of 233 Aa including an AF layer of 68 Aa Mn{sub 74}Ir{sub 26} and a pinned layer of 20 Aa Co{sub 90}Fe{sub 10}, where the SVs were field annealed at 320{degree}C. A microstructural analysis using x-ray diffraction revealed that H{sub ex} did not depend on the diffraction intensity from Mn{endash}Ir (111) for the SVs with various underlayers, and no remarkable changes occurred in the microstructure of the SVs with the heating treatment in a vacuum. Therefore, the enhancement effects might result from some changes in the microstructure and/or the morphology of the interface of AF/F layers. {copyright} 2001 American Institute of Physics.« less
  • Cited by 6
  • No abstract prepared.