Magnetic coupling in highly ordered NiO/Fe3O4(110): Ultrasharp magnetic interfaces vs. long-range magnetoelastic interactions

I. P. Krug; F. U. Hillebrecht; H. Gomonaj; M. W. Haverkort; A. Tanaka; L. H. Tjeng; C. M. Schneider

doi:10.1209/0295-5075/81/17005

All issues

Volume 81 / No 1 (January 2008)

EPL, 81 1 (2008) 17005

Abstract

Issue		EPL Volume 81, Number 1, January 2008


Article Number		17005
Number of page(s)		6
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/81/17005
Published online		20 November 2007

EPL, 81 (2008) 17005

Magnetic coupling in highly ordered NiO/Fe₃O₄(110): Ultrasharp magnetic interfaces vs. long-range magnetoelastic interactions

I. P. Krug¹, F. U. Hillebrecht¹, H. Gomonaj², M. W. Haverkort², A. Tanaka³, L. H. Tjeng⁴ and C. M. Schneider¹

¹ Institut für Festkörperforschung IFF-9, Forschungszentrum Jülich GmbH - 52425 Jülich, Germany
² Bogolyubov Institute for Theoretical Physics NAS of Ukraine - st. Metrologichna, 14-b, 03143, Kiev, Ukraine
³ Department of Quantum Matter, ADSM, Hiroshima University - Higashi-Hiroshima, 739-8530, Japan
⁴ Physikalisches Institut II, Universität zu Köln - 50937 Köln, Germany

Corresponding author: i.krug@fz-juelich.de

Received: 22 August 2007
Accepted: 28 October 2007

Abstract

We present a laterally resolved X-ray magnetic dichroism study of the magnetic proximity effect in a highly ordered oxide system, i.e. NiO films on Fe₃O₄(110). We found that the magnetic interface shows an ultrasharp electronic, magnetic and structural transition from the ferrimagnet to the antiferromagnet. The monolayer which forms the interface reconstructs to NiFe₂O₄ and exhibits an enhanced Fe and Ni orbital moment, possibly caused by bonding anisotropy or electronic interaction between Fe and Ni cations. The absence of spin-flop coupling for this crystallographic orientation can be explained by a structurally uncompensated interface and additional magnetoelastic effects.

PACS: 75.70.Cn – Magnetic properties of interfaces (multilayers, superlattices, heterostructures) / 75.70.Ak – Magnetic properties of monolayers and thin films / 75.25.+z – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.)

© EPLA, 2008

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