About: Exchange bias in UO2/Fe3O4 thin films above the Neel temperature of UO2

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Attributes	Values
rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://dx.doi.org/10.1063/1.4896635
Description	Magnetic exchange bias (EB) has been investigated on antiferromagnetic/ferrimagnetic heterostructures consisting of a stoichiometric UO2 film grown epitaxially on a LaAlO3 substrate and covered with highly textured Fe3O4 layers of variable thickness (t(Fe3O4) = 90-700 angstrom). EB values reaching similar to 2.6 kOe were observed at lowest temperatures in UO2/Fe3O4 with the thinnest Fe3O4. Magnetization measurements demonstrate that a remarkably large exchange bias in UO2/Fe3O4 is present at temperatures higher than the bulk Neel temperature of UO2 (T-N = 30.8 K). Our study reveals a complex nature of the effect: we suggest that it is provided both by strong exchange coupling between UO2 and Fe3O4 and by exchange biasing within magnetite (up to 25% of the total effect at 5K in the UO2/Fe3O4 sample with the largest EB). The former can be caused by proximity effects of Fe3O4 on TN combined with a magnetic anisotropy of UO2, persisting above a continuous magnetic-ordering transformation. For magnetite, the results indicate the presence of pinned moments up to 120 K that correlates with the change in the easy magnetization axis of Fe3O4 across the Verwey transition. (C) 2014 AIP Publishing LLC. Magnetic exchange bias (EB) has been investigated on antiferromagnetic/ferrimagnetic heterostructures consisting of a stoichiometric UO2 film grown epitaxially on a LaAlO3 substrate and covered with highly textured Fe3O4 layers of variable thickness (t(Fe3O4) = 90-700 angstrom). EB values reaching similar to 2.6 kOe were observed at lowest temperatures in UO2/Fe3O4 with the thinnest Fe3O4. Magnetization measurements demonstrate that a remarkably large exchange bias in UO2/Fe3O4 is present at temperatures higher than the bulk Neel temperature of UO2 (T-N = 30.8 K). Our study reveals a complex nature of the effect: we suggest that it is provided both by strong exchange coupling between UO2 and Fe3O4 and by exchange biasing within magnetite (up to 25% of the total effect at 5K in the UO2/Fe3O4 sample with the largest EB). The former can be caused by proximity effects of Fe3O4 on TN combined with a magnetic anisotropy of UO2, persisting above a continuous magnetic-ordering transformation. For magnetite, the results indicate the presence of pinned moments up to 120 K that correlates with the change in the easy magnetization axis of Fe3O4 across the Verwey transition. (C) 2014 AIP Publishing LLC. (en)
Title	Exchange bias in UO2/Fe3O4 thin films above the Neel temperature of UO2 Exchange bias in UO2/Fe3O4 thin films above the Neel temperature of UO2 (en)
skos:prefLabel	Exchange bias in UO2/Fe3O4 thin films above the Neel temperature of UO2 Exchange bias in UO2/Fe3O4 thin films above the Neel temperature of UO2 (en)
skos:notation	RIV/00216208:11320/14:10282075!RIV15-MSM-11320___
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(LM2011025)
http://linked.open...iv/cisloPeriodika	12
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Havela, Ladislav Daniš, Stanislav
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Matematicko-fyzikální fakulta
http://linked.open...dnocenehoVysledku	15670
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/14:10282075
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	systems; bilayers; nanoparticles; hysteresis; model; fe3o4 films; magnetic-anisotropy (en)
http://linked.open.../riv/klicoveSlovo	model nanoparticles systems hysteresis magnetic-anisotropy bilayers fe3o4 films
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[EF9EB5E5C210]
http://linked.open...i/riv/nazevZdroje	Applied Physics Letters
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	7 (xsd:int)
http://linked.open...vavai/riv/projekt	MLTL - Magnetism and Low Temperature Laboratories - operation and development of national research infrastructure
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	105
http://linked.open...iv/tvurceVysledku	Daniš, Stanislav Gouder, T. Havela, Ladislav Caciuffo, R. Tereshina, E. A. Bao, Z. Kuebel, C.
http://linked.open...ain/vavai/riv/wos	000343004400049
issn	0003-6951
number of pages	5 (xsd:int)
http://bibframe.org/vocab/doi	10.1063/1.4896635
http://localhost/t...ganizacniJednotka	11320

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