Issue
EPL
Volume 88, Number 2, October 2009
Article Number 27004
Number of page(s) 6
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/88/27004
Published online 04 November 2009
EPL, 88 (2009) 27004
DOI: 10.1209/0295-5075/88/27004

Decoupling of magnetic core and shell contributions in antiferromagnetic Co3O4 nanostructures

M. 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

Maria.BenitezRomero@ruhr-uni-bochum.de
Oleg.Petracic@ruhr-uni-bochum.de

received 27 August 2009; accepted in final form 1 October 2009; published October 2009
published online 4 November 2009

Abstract
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.

PACS
75.75.+a - Magnetic properties of nanostructures.
75.50.Ee - Antiferromagnetics.
62.23.Hj - Nanowires.

© EPLA 2009