title: Direct observation of exchange bias related uncompensated spins at the CoO/Cu interface.
abstract: Magnetization-induced optical second harmonic generation (MSHG) from the exchange-biased CoO/Cu-(X)/Fe multilayer shows the presence of pinned uncompensated spins at the CoO/Cu interface. For increasing Cu spacer thickness, the exchange bias measured via the hysteresis loop shift diminishes and disappears at X = 3.5 nm, while the MSHG signal still shows a strong magnetic contribution from the CoO interface. This indicates that the magnetic interaction between Fe and CoO layers is sufficiently strong to induce order in the antiferromagnetic layer even at a spacer thickness for which there is no observable hysteresis loop shift.
authors.affiliation: Institute for Molecules and Materials, Radboud University Nijmegen, Toernooiveld 1, 6525ED, Nijmegen, The Netherlands. V.Valev@science.ru.nl
authors.forename: V K
authors.initials: VK
authors.lastname: Valev
authors.forename: M
authors.initials: M
authors.lastname: Gruyters
authors.forename: A
authors.initials: A
authors.lastname: Kirilyuk
authors.forename: Th
authors.initials: T
authors.lastname: Rasing