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Title: Domain structure and magnetization reversal ofantiferromagnetically coupled perpendicular anisotropy films

Abstract

We describe experimental and theoretical investigations ofthe magnetic domain formation and the field reversal behavior inantiferromagnetically coupled perpendicular anisotropy multilayers thatmimic A-type antiferromagnet (AF) structures. The samples are sputterdeposited Co/Pt multilayers with perpendicular anisotropy that areperiodically interleaved with Ru to mediate an antiferromagneticinterlayer exchange. This structure allows precise tuning of thedifferent magnetic energy terms involved. Using various magnetometry andmagnetic imaging techniques as well as resonant soft X-ray scattering weprovide a comprehensive study of the remanent and demagnetizedconfigurations as well as the corresponding reversal mechanisms. We findthat adding AF exchange to perpendicular anisotropy system alters thetypical energy balance that controls magnetic stripe domain formation,thus resulting in two competing reversal modes for the composite system.In the AF-exchange dominated regime the magnetization isferromagnetically ordered within the film plane with the magnetization ofadjacent layers anti-parallel thus minimizing the interlayer AF exchangeenergy. In the dipolar dominated regime the magnetization pattern formsferromagnetic (FM) stripe domains where adjacent layers are verticallycorrelated, but laterally anti-correlated thus minimizing the dipolarenergy at the expense of the AF interlayer coupling. By tuning the layerthickness or applying a magnetic field, we observed the co-existence ofAF domains and FM stripe domains. We find that a FM phase exists at AFdomain boundaries, causing complexmore » mesoscopic domain patterns withsurprising reversibility during minor loop field cycling.« less

Authors:
; ; ;
Publication Date:
Research Org.:
COLLABORATION - Hitachi Global StorageTechnologies
OSTI Identifier:
929667
Report Number(s):
LBNL-63341
Journal ID: ISSN 0304-8853; JMMMDC; R&D Project: 504103; TRN: US200812%%740
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Magnetism and Magnetic Materials; Journal Volume: 319; Journal Issue: 1-2; Related Information: Journal Publication Date: online05/08/2007
Country of Publication:
United States
Language:
English
Subject:
75; 36; ANISOTROPY; DOMAIN STRUCTURE; ENERGY BALANCE; MAGNETIC FIELDS; MAGNETIZATION; SCATTERING; THICKNESS; TUNING; Layered antiferromagnet; Perpendicular anisotropy; Domainstructure; Reversal mechanism; AF exchange coupling; Stripedomain

Citation Formats

Hellwig, Olav, Berger, Andreas, Kortright, Jeffrey B., and Fullerton,Eric E. Domain structure and magnetization reversal ofantiferromagnetically coupled perpendicular anisotropy films. United States: N. p., 2007. Web. doi:10.1016/j.jmmm.2007.04.035.
Hellwig, Olav, Berger, Andreas, Kortright, Jeffrey B., & Fullerton,Eric E. Domain structure and magnetization reversal ofantiferromagnetically coupled perpendicular anisotropy films. United States. doi:10.1016/j.jmmm.2007.04.035.
Hellwig, Olav, Berger, Andreas, Kortright, Jeffrey B., and Fullerton,Eric E. Fri . "Domain structure and magnetization reversal ofantiferromagnetically coupled perpendicular anisotropy films". United States. doi:10.1016/j.jmmm.2007.04.035.
@article{osti_929667,
title = {Domain structure and magnetization reversal ofantiferromagnetically coupled perpendicular anisotropy films},
author = {Hellwig, Olav and Berger, Andreas and Kortright, Jeffrey B. and Fullerton,Eric E.},
abstractNote = {We describe experimental and theoretical investigations ofthe magnetic domain formation and the field reversal behavior inantiferromagnetically coupled perpendicular anisotropy multilayers thatmimic A-type antiferromagnet (AF) structures. The samples are sputterdeposited Co/Pt multilayers with perpendicular anisotropy that areperiodically interleaved with Ru to mediate an antiferromagneticinterlayer exchange. This structure allows precise tuning of thedifferent magnetic energy terms involved. Using various magnetometry andmagnetic imaging techniques as well as resonant soft X-ray scattering weprovide a comprehensive study of the remanent and demagnetizedconfigurations as well as the corresponding reversal mechanisms. We findthat adding AF exchange to perpendicular anisotropy system alters thetypical energy balance that controls magnetic stripe domain formation,thus resulting in two competing reversal modes for the composite system.In the AF-exchange dominated regime the magnetization isferromagnetically ordered within the film plane with the magnetization ofadjacent layers anti-parallel thus minimizing the interlayer AF exchangeenergy. In the dipolar dominated regime the magnetization pattern formsferromagnetic (FM) stripe domains where adjacent layers are verticallycorrelated, but laterally anti-correlated thus minimizing the dipolarenergy at the expense of the AF interlayer coupling. By tuning the layerthickness or applying a magnetic field, we observed the co-existence ofAF domains and FM stripe domains. We find that a FM phase exists at AFdomain boundaries, causing complex mesoscopic domain patterns withsurprising reversibility during minor loop field cycling.},
doi = {10.1016/j.jmmm.2007.04.035},
journal = {Journal of Magnetism and Magnetic Materials},
number = 1-2,
volume = 319,
place = {United States},
year = {Fri Mar 16 00:00:00 EDT 2007},
month = {Fri Mar 16 00:00:00 EDT 2007}
}