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FMR investigations of exchange biased NiFe/IrMn/NiFe trilayers with high and low Ni relative content.

Authors :
Dzhun, Irina O.
Babaytsev, Georgy V.
Chechenin, Nikolay G.
Gritsenko, Christina A.
Rodionova, Valeria V.
Source :
Journal of Magnetism & Magnetic Materials. Jan2019, Vol. 470, p151-155. 5p.
Publication Year :
2019

Abstract

Highlights • Trilayer Ni x Fe (1−x) (10нм)/IrMn(t AF)/Ni x Fe (1−x (10нм)/thin film structure. • Low-nickel, high-nickel permalloy. • Exchange bias, noncollinearity and magnetization of bottom and top ferromagnetic layers. • Ferromagnetic coupling through the antiferromagnetic spacer. • Rotatable anisotropy. Abstract Magnetic properties of trilayer double-exchange biased Si/Ta(30 nm)/Ni x Fe (1−x) (10 nm)/IrMn(t AF)/Ni x Fe (1−x (10 нм)/Ta(30 нм) thin film structures with x = 0.4 and x = 0.75 were investigated. The exchange bias, noncollinearity of unidirectional and uniaxial anisotropy and magnetization in both bottom and top ferromagnetic layers as a function of the antiferromagnetic (AF) layer thickness in the range from 2 to 50 nm were investigated. The obtained effects support the model of ferromagnetic coupling through the antiferromagnetic spacer and the model of rotatable anisotropy contribution at small AF thickness. It was found that usage of low-nickel permalloy in exchange biased systems has advantages of higher magnetization, a higher magnetic ordering at the interface and smaller critical thickness of antiferromagnetic layer to set the exchange bias, though provides a lower exchange bias compared with normal permalloy composition. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
03048853
Volume :
470
Database :
Academic Search Index
Journal :
Journal of Magnetism & Magnetic Materials
Publication Type :
Academic Journal
Accession number :
133044902
Full Text :
https://doi.org/10.1016/j.jmmm.2017.11.028