English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/181711
Share/Impact:
Statistics
logo share SHARE   Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Title

Exchange bias setting driven by a spontaneous crystallization of the antiferromagnetic layer.

AuthorsMigliorini, Andrea; Kuerbanjiang,Balati; Kepaptsoglou, Demie; Muñoz Sánchez, Manuel ; Cuñado, J. L. F.; Camarero, Julio; Aroca, C.; Vallejo-Fernández, Gonzalo; Lazarov, Vlado; Prieto, J. L.
Issue Date15-Jul-2018
Citation21st International Conference on Magnetism (2018)
AbstractMany magnetic devices in advanced electronics rely on the exchange bias (EB) of a soft ferromagnetic layer coupled to an antiferromagnetic material1-3. Setting and optimizing the exchange bias involves a thermal treatment in presence of an external magnetic field, which affects the degree of magnetic order at the interface between both materials4-5. In this work we demonstrate an alternative process for the generation of exchange bias6. In IrMn/FeCo bilayers, we have found the deposition conditions which leave the IrMn layer in a metastable amorphous/nanocrystalline phase (top inset to fig. 1). During the days after deposition, a structural phase transition in the IrMn layer develops spontaneously at room temperature and spreads according to a two-dimensional nucleation and growth process (fig. 1), leading to a highly crystalline, chemically-disordered γ-phase (bottom inset to fig. 1), which was characterized by XRD and TEM. The magnetic characterization by VSM and MOKE microscopy (fig. 2) reveals that the disordered state of the as-deposited IrMn does not lead to any measurable exchange bias in the adjacent FeCo layer. As the crystalline IrMn phase propagates across the sample, the FeCo gets progressively exchange-biased in the direction of its remanent magnetization. This allows the interesting possibility of controlling the direction of the exchange bias, simply by switching the magnetization of the FeCo layer as the phase transition propagates in the IrMn. The resulting microscopic patterning of the EB direction in a spin valve device is shown in fig. 2. The study of this mechanism for establishing and tailoring the exchange bias in IrMn/FeCo bilayers, can contribute toward the clarification of fundamental aspects of this phenomenon, as well as toward the development of innovative spintronic devices.
DescriptionTrabajo presentado en el 21st International Conference on Magnetism (ICM2018), celebrado en San Francisco (California, EE.UU.), del 15 al 20 de julio de 2018
URIhttp://hdl.handle.net/10261/181711
Appears in Collections:(IMN-CNM) Comunicaciones congresos
Files in This Item:
File Description SizeFormat 
accesoRestringido.pdf15,38 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.