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Publication details for Prof Brian TannerFan, R, Kinane, CJ, Charlton, TR, Dorner, R, Ali, M, de Vries, MA, Brydson, RMD, Marrows, CH, Hickey, BJ, Arena, DA, Tanner, BK, Nisbet, G & Langridge, S (2010). Ferromagnetism at the interfaces of antiferromagnetic FeRh epilayers. Physical Review B 82(18): 184418
- Publication type: Journal Article
- ISSN/ISBN: 1098-0121, 1550-235X
- DOI: 10.1103/PhysRevB.82.184418
- Keywords: THIN-FILMS; METAL-ALLOYS; MULTILAYERS; TRANSITION; PRESSURE; RH
- Further publication details on publisher web site
- Durham Research Online (DRO) - may include full text
Author(s) from Durham
AbstractThe nanoscale magnetic structure of FeRh epilayers has been studied by polarized neutron reflectometry. Epitaxial films with a nominal thickness of 500 Å were grown on MgO (001) substrates via molecular-beam epitaxy and capped with 20 Å of MgO. The FeRh films show a clear transition from the antiferromagnetic (AF) state to the ferromagnetic (FM) state with increasing temperature. Surprisingly the films possess a FM moment even at a temperature 80 K below the AF-FM transition temperature of the film. We have quantified the magnitude and spatial extent of this FM moment, which is confined to within ∼60–80 Å of the FeRh near the top and bottom interfaces. These interfacial FM layers account for the unusual effects previously observed in films with thickness <100 Å. Given the delicate energy balance between the AF and FM ground states we suggest a metastable FM state resides near to the interface within an AF matrix. The length scale over which the FM region resides is consistent with the strained regions of the film.
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