Magnetoresistive Properties of CoFe/Cu/CoFe/Dy Pseudo Spin Valves under Conditions of Interdiffusion of Dysprosium and CoFe Ferromagnetic Alloy Layers

Pseudo spin valve nanostructures, which comprise a dysprosium layer and exhibit giant magnetoresistance, are prepared by magnetron sputtering. The field dependences of magnetoresistance of the as-prepared nanostructures and nanostructures subjected to annealing and prolonged aging at room temperatur...

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Bibliographic Details
Published in:Physics of metals and metallography 2019-05, Vol.120 (5), p.429-435
Main Authors: Naumova, L. I., Milyaev, M. A., Zavornitsyn, R. S., Krinitsina, T. P., Chernyshova, T. A., Proglyado, V. V., Ustinov, V. V.
Format: Article
Language:English
Subjects:
Alloys
Analysis
Annealing
Chemistry and Materials Science
Dysprosium base alloys
Electrical and Magnetic Properties
Ferromagnetic materials
Ferromagnetism
Giant magnetoresistance
Interdiffusion
Magnetic alloys
Magnetic properties
Magnetism
Magnetoresistance
Magnetoresistivity
Magnetron sputtering
Materials Science
Metallic Materials
Microstructure
Nanostructure
Rare earth metal compounds
Specialty metals industry
Spin valves
Valves
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Summary:Pseudo spin valve nanostructures, which comprise a dysprosium layer and exhibit giant magnetoresistance, are prepared by magnetron sputtering. The field dependences of magnetoresistance of the as-prepared nanostructures and nanostructures subjected to annealing and prolonged aging at room temperature were measured in a 83–333 K temperature range. Changes in the shape of magnetoresistance curves are used to identify changes in the magnetic state of the nanostructure. The microstructure of the nanostructures has been studied. Changes in the microstructure and magnetoresistive properties of pseudo spin valves were found, which are caused by annealing and storage. The results are interpreted on the assumption of the formation of Dy–Co–Fe ferromagnetic alloy at the CoFe/Dy interface.
ISSN:0031-918X
1555-6190
DOI:10.1134/S0031918X19050132