Structure and magnetotransport properties of multilayer Co77Fe17Ni6/Cu96In4 and Co77Fe17Ni6/Cu nanostructures with the giant magnetoresistance effect

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Resumo

Structural and magnetoresistive properties of multilayer Co77Fe17Ni6/Cu and Co77Fe17Ni6/Cu96In4 nanostructures with a number of magnetic layers and nonmagnetic interlayers of 1 to 11 are studied. The sharp axial ⟨111⟩ texture and more perfect interfaces are shown to form in the nanostructures with Cu96In4 interlayers, and a relatively small magnetoresistance hysteresis is observed. Atomic force microscopy is used to estimate the surface roughness and crystallite size of the samples under study. As the number of layers in the Cu96In4-based samples increases, the crystallite size is found to slightly change from layer to layer in a range of 18–22 nm, whereas, for the Cu-based sample, the crystallite size substantially increases. For superlattices with Cu interlayers, the 10-fold decrease in the magnetoresistance is observed as the thickness of Co77Fe17Ni6 layers slightly, namely, from 1.5 to 2 nm increases.

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Sobre autores

I. Naidanov

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

Autor responsável pela correspondência
Email: naydenus@mail.ru
Rússia, Ekaterinburg, 620108

M. Milyaev

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

Email: naydenus@mail.ru
Rússia, Ekaterinburg, 620108

V. Proglyado

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

Email: naydenus@mail.ru
Rússia, Ekaterinburg, 620108

V. Ustinov

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

Email: naydenus@mail.ru
Rússia, Ekaterinburg, 620108

Bibliografia

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2. Fig. 1. Dependence of hysteresis ∆H on the number of magnetic and non-magnetic layers for the Co77Fe17Ni6/Cu (series Ⅰ) and Co77Fe17Ni6/Cu96In4 (series II) superlattices.

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3. Fig. 2. Magnetoresistance curves of samples BL/Co77Fe17Ni6(1.5)/Cu(2.2)/Co77Fe17Ni6(1.5)/Ta(5) (series Ⅰ, NM – Cu) and BL/Co77Fe17Ni6(2)/Cu96In4(2)/ Co77Fe17Ni6(2)/Ta(5) (series II, NM – Cu96In4).

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4. Fig. 3. Dependence of the average crystallite size on the number of layers for multilayer nanostructures Co77Fe17Ni6/Cu (series Ⅰ) and Co77Fe17Ni6/Cu96In4 (series II).

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5. Fig. 4. Diffraction patterns of the Co77Fe17Ni6/Cu (1) and Co77Fe17Ni6/Cu96In4 (2) superlattices. The inset shows the rocking curves around the (111) peaks.

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6. Fig. 5. Reflectograms of samples with Cu and Cu96In4 interlayers for the number of layers N = 3, 11.

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7. Fig. 6. Dependence of the surface roughness of the series of samples (I) and (II) with Cu and Cu96In4 interlayers on the number of layers N.

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8. Fig. 7. Magnetoresistance curves of Co77Fe17Ni6/Cu96In4 and Co77Fe17Ni6/Cu superlattices with the number of layers N = 11 and tFM = 2 nm.

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9. Fig. 8. Magnetoresistance curves of superlattices with copper interlayers and magnetic layer thickness tFM = 1.5, 1.8, 2 nm at N = 11.

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