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Title: Critical size for exchange bias in ferromagnetic-antiferromagnetic particles
Authors: Dobrynin, AN ×
Ievlev, DN
Temst, Kristiaan
Lievens, Peter
Margueritat, J
Gonzalo, J
Afonso, CN
Zhou, SQ
Vantomme, André
Piscopiello, E
Van Tendeloo, G #
Issue Date: Jul-2005
Publisher: Amer inst physics
Series Title: Applied Physics Letters vol:87 issue:1 pages:1-3
Article number: 012501
Abstract: We present a study of the magnetic properties of oxidized Co nanoparticles with an average grain size of 3 nm, embedded in an amorphous Al2O3 matrix. These nanoparticles can be considered as imperfect Co-core CoO-shell systems. Magnetization measurements after magnetic field cooling show a vertical shift of the hysteresis loop, while no exchange bias is observed. With a simple model, we show that there is a critical grain size for hybrid ferromagnetic-antiferromagnetic particles, below which exchange bias is absent for any ratio of ferromagnetic and antiferromagnetic constituents. The reason is that the interfacial exchange energy dominates over other energies in the system due to a large surface-to-volume ratio in the nanoparticles. (c) 2005 American Institute of Physics.
ISSN: 0003-6951
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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