Magnetic and Superconducting Properties of the Heterogeneous Layered Structures V/Fe 0.7 V 0.3 /V/Fe 0.7 V 0.3 /Nb and N
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DISORDER, AND PHASE TRANSITION IN CONDENSED SYSTEM
Magnetic and Superconducting Properties of the Heterogeneous Layered Structures V/Fe0.7V0.3/V/Fe0.7V0.3/Nb and Nb/Ni0.65(0.81)Cu0.35(0.19) V. D. Zhaketova, Yu. V. Nikitenkoa,*, Yu. N. Khaidukovb, O. V. Skryabinac, A. Csikd, M. M. Borisove, E. Kh. Mukhamedzhanove, S. N. Vdovichevf, E. I. Litvinenkoa, A. V. Petrenkoa, and A. V. Churakova a Joint
Institute for Nuclear Research, Dubna, Moscow oblast, 141980 Russia Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119992 Russia c Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432 Russia d Institute for Nuclear Research, Hungarian Academy of Sciences, Debrecen, H-4026 Hungary e Russian Research Centre Kurchatov Institute, Moscow, 123182 Russia f Institute for Physics of Microstructures, Russian Academy of Sciences, Nizhny Novgorod, 603087 Russia *e-mail: [email protected] b
Received December 3, 2018; revised February 1, 2019; accepted February 14, 2019
Abstract—The heterogeneous ferromagnetic–superconducting layered heterostructures V/Fe0.7V0.3/V/Fe0.7V0.3/Nb and Nb/Ni0.65(0.81)Cu0.35(0.19), which contain magnetic clusters and ferromagnetic domains, are studied. The magnetic and superconducting properties of the structures depend on the magnetic-layer thickness, the magnetic field, and the time elapsed from structure preparation. We detected the interaction of clusters with a domain structure, diamagnetism and magnetization reversal of the magnetic layer during the superconducting transition in a ferromagnetic–superconducting heterostructure, and a superconducting transition in the magnetic layer. The magnetic and resistive properties of the heterostructures changed in several weeks and months. DOI: 10.1134/S1063776119070136
1. INTRODUCTION A number of new phenomena caused by the interaction of ferromagnetic and superconducting order parameters have been predicted for ferromagnetic– superconducting (FS) layered heterostructures. These are cryptoferromagnetism [1–6], the inverse proximity effect [7–9], a spontaneous vortex phase [10–12], and triplet superconductivity [13, 14]. These phenomena were detected and studied in many experimental works, which usually applied macroscopic methods, such as the measurement of the magnetic moment and the resistance of a structure. The interaction of ferromagnetism and superconductivity manifests itself in a simultaneous change in the magnetic and superconducting properties of contacting ferromagnetic and superconducting layers. The interface between the layers in real structures is rather long and comparable with the ferromagnetic and superconducting coherent lengths. Therefore, the properties of the region in the vicinity of the interface change along with changes in the properties of contacting ferromagnetic and superconducting layers. Hence, the problem mainly con-
sists in the determination of the spatial magnetic and superconducting profiles of the entire structure as functions of external parameters.
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