Features of the behavior of the superconducting spin valve Fe1/Cu/Fe2/Cu/Pb on a piezoelectric substrate

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The properties of the superconducting spin valve Fe1/Cu/Fe2/Cu/Pb on a piezoelectric substrate PMN-PT ([Pb(Mg1/3Nb2/3) O3]0.7 — [PbTiO3]0.3) in external magnetic and electric fields are studied. The magnitude of the shift of the superconducting transition temperature more than 200 mK was found when the mutual orientation of the magnetizations of the ferromagnetic layers changes from antiparallel to perpendicular in the magnetic field H0 = 1 kOe. In this case, an anomalous behavior of the dependence of superconducting transition temperature on the angle between the magnetizations of the ferromagnetic layers was detected, which manifested itself in the maximum values of superconducting transition temperature at an orthogonal orientation of the magnetizations of the ferromagnetic layers. The full effect of the superconducting spin valve was observed. It has been established that with an increase in the applied electric field to the PMN-PT piezoelectric substrate, the shift of the superconducting transition temperature increases. The maximum shift was 10 mK at an electric field strength of 1 kV/cm.

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А. Kаmаshev

Federal Research Center Kazan Scientific Center of the Russian Academy of Sciences

编辑信件的主要联系方式.
Email: kаmаndi@mаil.ru

Zavoisky Physical-Technical Institute

俄罗斯联邦, Kаzаn

A. Validov

Federal Research Center Kazan Scientific Center of the Russian Academy of Sciences

Email: kаmаndi@mаil.ru

Zavoisky Physical-Technical Institute

俄罗斯联邦, Kаzаn

N. Garif’yanov

Federal Research Center Kazan Scientific Center of the Russian Academy of Sciences

Email: kаmаndi@mаil.ru

Zavoisky Physical-Technical Institute

俄罗斯联邦, Kаzаn

S. Bolshakov

Federal Research Center Kazan Scientific Center of the Russian Academy of Sciences

Email: kаmаndi@mаil.ru

Zavoisky Physical-Technical Institute

俄罗斯联邦, Kаzаn

R. Mamin

Federal Research Center Kazan Scientific Center of the Russian Academy of Sciences

Email: kаmаndi@mаil.ru

Zavoisky Physical-Technical Institute

俄罗斯联邦, Kаzаn

I. Gаrifullin

Federal Research Center Kazan Scientific Center of the Russian Academy of Sciences

Email: kаmаndi@mаil.ru

Zavoisky Physical-Technical Institute

俄罗斯联邦, Kаzаn

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2. Fig. 1. Model of the studied structures of the SSC (a). Scheme of measuring the specific electrical resistance of samples by the standard four-contact method in an electric field (b): 1, 4 — current electrodes; 2, 3 — potential electrodes; 5, 6 — capacitive plates (capacitor plates) for applying an electric field to the piezoelectric substrate.

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3. Fig. 2. Superconducting transition curves for the PMN-PT/Fe1(3 nm)/Cu(4 nm)/Fe2(1 nm)/Cu(1.2 nm)/Pb(60 nm) sample, measured at different orientations of the magnetizations of the F-layers (P – α = 0°; PP — α = 90°; AP — α = 180°) in an external magnetic field H0 = 1 kOe. The experimental error corresponds to the size of the symbols.

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4. Fig. 3. Dependence of the Tc shift (ΔTc΄) on the strength of the external electric field (E) applied to the PMN-PT piezoelectric substrate for the PMN-PT/Fe1(3 nm)/Cu(4 nm)/Fe2(1 nm)/Cu(1.2 nm)/Pb(60 nm) sample. The inset shows the superconducting transition curves for the PMN-PT/Fe1(3 nm)/Cu(4 nm)/Fe2(1 nm)/Cu(1.2 nm)/Pb(60 nm) sample when an electric field is applied to the PMN-PT piezoelectric substrate. The experimental error corresponds to the size of the symbols.

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