Decoupling of magnetic core and shell contributions in antiferromagnetic Co3O4 nanostructuresM. J. Benitez1, 2, O. Petracic1, H. Tüysüz2, F. Schüth2 and H. Zabel1
1 Experimentalphysik IV, Ruhr-Universität Bochum - D-44780 Bochum, Germany, EU
2 Max-Planck Institut für Kohlenforschung - D-45470 Mülheim an der Ruhr, Germany, EU
received 27 August 2009; accepted in final form 1 October 2009; published October 2009
published online 4 November 2009
The magnetic behavior of antiferromagnetic nanostructures is usually dominated by a core-shell structure. Here we report on a magnetometry study on antiferromagnetic Co3O4 nanostructures showing a magnetic decoupling of the core and its surface contribution below a critical structure size. Systems with sizes larger than 8 nm yield a common coupled magnetometric behavior of core and shell. However, for smaller structure sizes the core and shell contributions show independent magnetization signatures indicating a decoupling scenario.
75.75.+a - Magnetic properties of nanostructures.
75.50.Ee - Antiferromagnetics.
62.23.Hj - Nanowires.
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