Europhys. Lett.
Volume 66, Number 3, May 2004
Page(s) 430 - 434
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 April 2004
Europhys. Lett., 66 (3) , pp. 430-434 (2004)
DOI: 10.1209/epl/i2003-10223-y

On the mechanism of irradiation-enhanced exchange bias

S. Poppe, J. Fassbender and B. Hillebrands

Fachbereich Physik and Forschungsschwerpunkt MINAS Technische Universität Kaiserslautern - Erwin-Schrödinger-Straße 56 67663 Kaiserslautern, Germany

(Received 28 November 2003; accepted 2 March 2004)

By means of layer-resolved ion irradiation, the mechanisms involved in the irradiation-driven modifications of the exchange bias effect in $\chem{NiFe/FeMn}$ bilayers have been investigated. It is shown that not only the locations of the defects but also the magnetic coupling between both layers during the irradiation process is of crucial importance. This requires an extension of current models accounting for defects in exchange bias systems.

75.70.Cn - Magnetic properties of interfaces (multilayers, superlattices, heterostructures).
61.80.Jh - Ion radiation effects.
75.30.Gw - Magnetic anisotropy.

© EDP Sciences 2004