Magnetoresistance of CoFeNi/Cu Superlattices Differing in the Ferromagnetic Alloy Composition


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Abstract—The structure and magnetoresistive properties of Ta(5 nm)/NiFeCr(5 nm)/[FM(tFM)/Cu(2.2 nm)]n/ Ta(5 nm) superlattices prepared by magnetron sputtering are studied in this work. The ferromagnetic layer thickness tFM is varied in a 1.1–1.5 nm range. The Co90Fe10, Co85Fe12Ni3, Co77Fe17Ni6, and Co70Fe20Ni10 alloys with an fcc structure and close saturation magnetization values are used as the ferromagnetic (FM) materials. It is shown that, as the Ni and Fe contents in the CoFeNi alloy increase, the magnetoresistance of superlattices containing eight bilayers remains high and equal to 24–28%; in this case, the twofold decrease in the hysteresis occurs. As the number of bilayers in the superlattices, which contain CoFeNi alloys differing in composition increases to 12, the close values of magnetoresistance 30–31% are obtained. The correlation between the saturation magnetization of the ferromagnetic material of superlattice layers and maximum value of magnetoresistance is discussed.

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M. Milyaev

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University Named after the First President of Russia B.N. Yeltsin, Institute of Natural Sciences and Mathematics

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Email: milyaev@imp.uran.ru
俄罗斯联邦, Ekaterinburg, 620990; Ekaterinburg, 620002

N. Bannikova

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: milyaev@imp.uran.ru
俄罗斯联邦, Ekaterinburg, 620990

L. Naumova

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University Named after the First President of Russia B.N. Yeltsin, Institute of Natural Sciences and Mathematics

Email: milyaev@imp.uran.ru
俄罗斯联邦, Ekaterinburg, 620990; Ekaterinburg, 620002

V. Proglyado

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: milyaev@imp.uran.ru
俄罗斯联邦, Ekaterinburg, 620990

E. Patrakov

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: milyaev@imp.uran.ru
俄罗斯联邦, Ekaterinburg, 620990

I. Kamenskii

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: milyaev@imp.uran.ru
俄罗斯联邦, Ekaterinburg, 620990

V. Ustinov

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University Named after the First President of Russia B.N. Yeltsin, Institute of Natural Sciences and Mathematics

Email: milyaev@imp.uran.ru
俄罗斯联邦, Ekaterinburg, 620990; Ekaterinburg, 620002

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