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          Institute: MPI für Chemische Physik fester Stoffe     Collection: publications 2013     Display Documents



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ID: 670764.0, MPI für Chemische Physik fester Stoffe / publications 2013
Direct observation of rotatable uncompensated spins in the exchange bias system Co/CoO-MgO
Authors:Ge, C. N.; Wan, X. G.; Pellegrin, E.; Hu, Z.; Valvidares, S. M.; Barla, A.; Liang, W. I.; Chu, Y. H.; Zou, W. Q.; Du, Y. W.
Language:English
Date of Publication (YYYY-MM-DD):2013-02-28
Title of Journal:Nanoscale
Volume:5
Issue / Number:21
Start Page:10236
End Page:10241
Review Status:not specified
Audience:Not Specified
Abstract / Description:We have observed a large exchange bias field H-E approximate to 2460 Oe and a large coercive field H-C approximate to 6200 Oe at T = 2 K for Co/CoO core-shell nanoparticles (similar to 4 nm diameter Co metal core and CoO shell with similar to 1 nm thickness) embedded in a non-magnetic MgO matrix. Our results are in sharp contrast to the small exchange bias and coercive field in the case of a non-magnetic Al2O3 or C matrix materials reported in previous studies. Using soft X-ray magnetic circular dichroism at the Co-L-2,L-3 edge, we have observed a ferromagnetic signal originating from the antiferromagnetic CoO shell. This gives direct evidence for the existence of rotatable interfacial uncompensated Co spins in the nominally antiferromagnetic CoO shell, thus supporting the uncompensated spin model as a microscopic description of the exchange bias mechanism.
External Publication Status:published
Document Type:Article
Communicated by:Ina Werner
Affiliations:MPI für chemische Physik fester Stoffe
Identifiers:ISI:000325762000021 [ID No:1]
ISSN:2040-3364 [ID No:2]
DOI:10.1039/c3nr02013d
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