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Article: <archive_home_articles> Abstract
Nature Materials 2, 112?116 (2003)
A new phase diagram for layered antiferromagnetic films
OLAV HELLWIG1, TARYL L. KIRK1, 2, JEFFREY B. KORTRIGHT3, ANDREAS BERGER1
and ERIC E. FULLERTON1
1 IBM Almaden Research Center, San Jose, California 95120, USA
2 Department of Physics, University of California-San Diego, La Jolla,
California 92093, USA
3 Materials Science Division, Lawrence Berkeley National Laboratory,
Berkeley, California 94720, USA

Correspondence to: ERIC E. FULLERTON eef@us.ibm.com
<mailto:eef%40us.ibm.com>

Nature Materials AOP Published online: 12 January 2003 |
doi:10.1038/nmat806

Abstract

Magnetic multilayer films provide convenient model systems for studying
the physics of antiferromagnetic films and surfaces. Here we report on
the magnetic reversal and domain structure in antiferromagnetically
coupled Co/Pt multilayers that are isomorphic to layered
antiferromagnetic films with perpendicular magnetic anisotropy. We
observe two distinct remanent states and reversal modes of the system.
In mode 1 the magnetization in each layer reverses independently,
producing an antiferromagnetic remanent state that shows full lateral
correlation and vertical anticorrelation across the interlayers. In mode
2 the reversal in adjacent layers is locally synchronized with a
remanent state that is vertically correlated but laterally
anticorrelated in ferromagnetic stripe domains. Theoretical energy
calculations of the two ground states identify a new phase boundary that
is in good agreement with our experimental results.



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