Superconducting properties of Co1/Cu/Co2/Cu/Pb heterostructure on piezoelectric substrate PMN-PT

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The effect of the PMN-PT piezoelectric substrate ([Pb(Mg1/3Nb2/3) O3]0.7 — [PbTiO3]0.3) on the superconducting properties of the PMN-PT/Co1/Cu/Co2/Cu/Pb thin-film heterostructure was studied. The change in superconducting transition temperature (Tc) was recorded when an electric field was applied to the PMN-PT substrate and in an external magnetic field. The maximum difference in Tc was 15 mK when an electric field of 1 kV/cm was applied. In an external magnetic field, the maximum difference in Tc was more than 80 mK when the mutual direction of the magnetizations of the ferromagnetic layers changed from parallel/antiparallel to perpendicular.

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作者简介

А. Kаmаshev

Federal Research Center Kazan Scientific Center of 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, Kazan

A. Validov

Federal Research Center Kazan Scientific Center of Russian Academy of Sciences

Email: kаmаndi@mаil.ru

Zavoisky Physical-Technical Institute

俄罗斯联邦, Kazan

S. Bol’shakov

Federal Research Center Kazan Scientific Center of Russian Academy of Sciences

Email: kаmаndi@mаil.ru

Zavoisky Physical-Technical Institute

俄罗斯联邦, Kazan

N. Garif’yanov

Federal Research Center Kazan Scientific Center of Russian Academy of Sciences

Email: kаmаndi@mаil.ru

Zavoisky Physical-Technical Institute

俄罗斯联邦, Kazan

I. Gаrifullin

Federal Research Center Kazan Scientific Center of Russian Academy of Sciences

Email: kаmаndi@mаil.ru

Zavoisky Physical-Technical Institute

俄罗斯联邦, Kazan

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2. Fig. 1. Structures of the prepared samples with a circuit for measuring electrical resistance, where 1, 4 are current electrodes; 2, 3 are potential electrodes; 5, 6 are 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/Co1(3 nm)/Cu(4 nm)/Co2(1 nm)/Cu(1.2 nm)/Pb(60 nm)/ /Si3N4 sample, measured without an electric field and with an applied electric field of 1 kV/cm.

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4. Fig. 3. Superconducting transition curves for the PMN-PT/Co1(3 nm)/Cu(4 nm)/Co2(1 nm)/Cu(1.2 nm)/Pb(60 nm)/Si3N4 sample measured at collinear and orthogonal (Tc) orientations of the magnetizations of the F-layers in an external magnetic field of H0 = 1 kOe. The inset shows the dependence of Tc on the angle α between the magnetizations of the F-layers in an external magnetic field of H0 = 1 kOe.

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