6533b85dfe1ef96bd12bdcfc
RESEARCH PRODUCT
Absence of element specific ferromagnetism in Co doped ZnO investigated by soft X-ray resonant reflectivity
Milan GacicThomas TietzeEberhard GoeringGerhard JakobH. AdrianS. Brücksubject
HistorySurface coatingMaterials scienceCondensed matter physicsTransition metalFerromagnetismMagnetismMagnetic circular dichroismDopingGrain boundaryComputer Science ApplicationsEducationPulsed laser depositiondescription
On the quest for the intrinsic origin of ferromagnetism (FM) in ZnO doped with a few percent transition metal, we show detailed X-ray resonant magnetic reflectivity (XRMR) measurements, performed at the Co L2,3 and the O K edges of pulsed laser deposition (PLD) prepared samples. These samples show ferromagnetism at room temperature (RT) (QUID: about 2μB /Co). But in contrast to the QUID measurements, element specific reflection measurements as a function of angle (θ-2θ scans) and energy (const. qz) do not show any sign of ferromagnetism. Therefore, we can exclude without doubt Co as a possible origin for FM in this system. Our results are in perfect agreement with earlier published XMCD data and strongly support the new proposed grain boundary based model for oxygen vacancies related RT-FM.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-01-01 | Journal of Physics: Conference Series |