title: Reversing the training effect in exchange biased CoO/Co bilayers.
abstract: We performed a detailed study of the training effect in exchange biased CoO/Co bilayers. High-resolution measurements of the anisotropic magnetoresistance (AMR) display an asymmetry in the first magnetization reversal process and training in the subsequent reversal processes. Surprisingly, the AMR measurements as well as magnetization measurements reveal that it is possible to partially reinduce the untrained state by performing a hysteresis measurement with an in-plane external field perpendicular to the cooling field. Indeed, the next hysteresis loop obtained in a field parallel to the cooling field resembles the initial asymmetric hysteresis loop, but with a reduced amount of spin rotation occurring at the first coercive field. This implies that the antiferromagnetic domains, which are created during the first reversal after cooling, can be partially erased.
authors.affiliation: Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium.
authors.forename: Steven
authors.initials: S
authors.lastname: Brems
authors.forename: Dieter
authors.initials: D
authors.lastname: Buntinx
authors.forename: Kristiaan
authors.initials: K
authors.lastname: Temst
authors.forename: Chris
authors.initials: C
authors.lastname: Van Haesendonck
authors.forename: Florin
authors.initials: F
authors.lastname: Radu
authors.forename: Hartmut
authors.initials: H
authors.lastname: Zabel