Title: Exploring the microscopic origin of exchange bias with photoelectron emission microscopy (invited)
Authors: Scholl, A ×
Nolting, F
Stohr, J
Regan, T
Luning, J
Seo, Jin Won
Locquet, Jean-Pierre
Fompeyrine, J
Anders, S
Ohldag, H
Padmore, HA #
Issue Date: 2001
Series Title: Journal of Applied Physics vol:89 issue:11, Part 2 pages:7266-7268
Conference: date:Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA; Stanford Synchrotron Radiat Lab, Stanford, CA 95120 USA; Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA; IBM Corp, Div Res, Zurich Res Lab, CH-8803 Ruschlikon, Switzerland; Univ Neuchatel, Inst Phys, CH-2000 Neuchatel, Switzerland; IBM Corp, Almaden Res Ctr, Div Res, San Jose, CA 95120 USA; Univ Dusseldorf, Inst Appl Phys, D-40225 Dusseldorf, Germany
Abstract: It is well known that magnetic exchange coupling across the ferromagnet-antiferromagnet interface results in an unidirectional magnetic anisotropy of the ferromagnetic layer, called exchange bias. Despite large experimental and theoretical efforts, the origin of exchange bias is still controversial, mainly because detection of the interfacial magnetic structure is difficult. We have applied photoelectron emission microscopy (PEEM) on several ferromagnet-antiferromagnet thin-film structures and microscopically imaged the ferromagnetic and the antiferromagnetic structure with high spatial resolution. Taking advantage of the surface sensitivity and elemental specificity of PEEM, the magnetic configuration and critical properties such as the Neel temperature were determined on LaFeO3 and NiO thin films and single crystals. On samples coated with a ferromagnetic layer, we microscopically observe exchange coupling across the interface, causing a clear correspondence of the domain structures in the adjacent ferromagnet and antiferromagnet. Field dependent measurements reveal a strong uniaxial anisotropy in individual ferromagnetic domains. A local exchange bias was observed even in not explicitly field-annealed samples, caused by interfacial uncompensated magnetic spins. These experiments provide highly desired information on the relative orientation of electron spins at the interface between ferromagnets and antiferromagnets. (C) 2001 American Institute of Physics.
ISSN: 0021-8979
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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