Title: Direct observation of the alignment of ferromagnetic spins by antiferromagnetic spins
Authors: Nolting, F ×
Scholl, A
Stohr, J
Seo, Jin Won
Fompeyrine, J
Siegwart, H
Locquet, Jean-Pierre
Anders, S
Luning, J
Fullerton, EE
Toney, MF
Scheinfein, MR
Padmore, HA #
Issue Date: 2000
Series Title: Nature vol:405 issue:6788 pages:767-769
Conference: date:Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA; IBM Corp, Almaden Res Ctr, Div Res, San Jose, CA 95120 USA; Univ Neuchatel, Inst Phys, CH-2000 Neuchatel, Switzerland; IBM Corp, Div Res, Zurich Res Lab, CH-8803 Ruschlikon, Switzerland; Arizona State Univ, Dept Phys & Astron, Tempe, AZ 85287 USA
Abstract: The arrangement of spins at interfaces in a layered magnetic material often has an important effect on the properties of the material. One example of this is the directional coupling between the spins in an antiferromagnet and those in an adjacent ferromagnet, an effect first discovered(1) in 1956 and referred to as exchange bias. Because of its technological importance for the development of advanced devices such as magnetic read heads(2) and magnetic memory cells(3), this phenomenon has received much attention(4,5). Despite extensive studies, however, exchange bias is still poorly understood, largely due to the lack of techniques capable of providing detailed information about the arrangement of magnetic moments near interfaces. Here we present polarization-dependent X-ray magnetic dichroism spectro-microscopy that reveals the micromagnetic structure on both sides of a ferromagnetic-antiferromagnetic interface. Images of thin ferromagnetic Co films grown on antiferromagnetic LaFeO3 show a direct link between the arrangement of spins in each material. Remanent hysteresis loops, recorded for individual ferromagnetic domains, show a local exchange bias. Our results imply that the alignment of the ferromagnetic spins is determined, domain by domain, by the spin directions in the underlying antiferromagnetic layer.
ISSN: 0028-0836
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
Physical Metallurgy and Materials Engineering Section (-)
× corresponding author
# (joint) last author

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