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Structural-Phase State and Magnetotransport Properties of Thin Film Alloys Based on Permalloy and Copper

Authors: Shpetnyi, Ihor Oleksandrovych; Tyshchenko, Kostiantyn Volodymyrovych; Pak, Vasyl Yakovych; Duzhyi, B.V.; Shkurdoda, Yurii Oleksiiovych; Protsenko, Ivan Yukhymovych;

Structural-Phase State and Magnetotransport Properties of Thin Film Alloys Based on Permalloy and Copper

Abstract

У роботі представлені результати досліджень впливу складу на структурно-фазовий стан та магніторезистивні властивості свіжосконденсованих та термооброблених при температурах Tв ≤ 900К зразків плівкових сплавів на основі Py та Cu. Зразки тонкоплівкових сплавів товщиною d = 25 нм в інтервалі складів 19 ≤ cCu ≤ 69 (де cCu – загальна концентрація Cu, ат.%) були отримані методом одночасного випаровування у вакуумі з двох незалежних випарників. Методом просвічуючої електронної мікроскопії було досліджено структурно-фазовий стан зразків плівкових сплавів при cCu = 19 ат.%, 34 aт.% та 61 ат.%. Структура тонких плівок як в свіжесконденсованому так і у відпаленому при Tв ≤ 900 K стані складаються з квазігранул пермалою, вбудованих у немагнітну матрицю Cu. Фазовий стан зразків при cCu = 19 ат.% та cCu = 3 4 ат.% у свіжосконденсованому стані та після термообробки при Tв = 600К відповідав ГЦК-NixFe(x ≈ 3) + ГЦК-Cu. Після термообробки при температурах 700 ≤ Tв ≤ 900 К фазовий стан зразків при cCu = 19 ат.% та cCu = 34 ат.% відповідав Ni3Fe + ГЦК-Cu. Для зразка плівкового сплаву при cCu = 61 ат.% у свіжесконденсованому стані та після термообробки при температурах 600 ≤ Tв ≤ 900 К фазовий стан відповідав ГЦК-NixFe (x ≈ 3) + ГЦК-Cu. Дослідження магніторезистивних властивостей плівкових зразків показали, що плівкові зразки у всьому інтервалі складів 19 ≤ cCu ≤ 69 aт.% характеризувалися ізотропним магнітоопором. Максимальне значення гігантського магнітоопору спостерігалося для зразка з cCu = 34 aт.% як у свіжосконденсованому стані так і після термообробки при температурах 600 ≤ Tв ≤ 900К. Термообробка зразків в інтервалі температур 600 ≤ Tв ≤ 900 К майже не вплинула на величину ГМО плівок при 19 ≤ cCu ≤ 51 aт.%. The paper presents the results of research influence of composition on structural-phase state and magnetoresistive properties of as-deposited and heat-treated at temperatures Ta ≤ 900К samples film alloys based on Py and Cu. Samples of thin film alloys with a thickness of d = 25 nm in the range of 19 ≤ cCu ≤ 69 (where cCu is the concentration of Cu, at.%) were obtained by the method of co-evaporation in vacuum from two independent evaporators. The structural-phase state of the samples of film alloys at cCu = 19 at.%, 34 at.% and 61 at.% was investigated by the method of transmission electron microscopy. The structure of thin films in both as-deposited and annealed at Ta ≤ 900 K state consists of quasi granules with permalloy embedded in a nonmagnetic Cu matrix. The phase state of the samples at cCu = 19 at.% and cCu = 34 at.% in the as-deposited state and after heat treatment at Ta = 600 K corresponded to fcc-NixFe (x ≈ 3) + fcc-Cu. After heat treatment at temperatures of 700 ≤ Ta ≤ 900 К, the phase state of the samples at cCu = 19 at.% and cCu = 34 at.% corresponded to Ni3Fe + fcc-Cu. For the film alloy sample at cCu = 61 at.% in the as-deposited state and after heat treatment at temperatures of 600 ≤ Ta ≤ 900 К, the phase state corresponded to fcc-NixFe (x ≈ 3) + fcc-Cu. Studies of the magnetoresistive properties of film samples showed that the film samples in the entire range of compositions of 19 ≤ cCu ≤ 69 at.% were characterized by isotropic magnetoresistance. The maximum value of the giant magnetoresistance was observed for the sample with cCu = 34 at.% Both in the as-deposited state and after heat treatment at temperatures of 600 ≤ Ta ≤ 900 К. Heat treatment of samples in the temperature range of 600 ≤ Ta ≤ 900 К had almost no effect on the value of GMR films at 19 ≤ cCu ≤ 51 at.%.

Keywords

пермалой, GMR effect, granular state, ефект ГМО, спін-залежне розсіювання, суперпарамагнетизм, permalloy, superparamagnetism, spin-dependent scatterin

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
Average
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