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Title: Magnetism in structures with ferromagnetic and superconducting layers

Abstract

The influence of superconductivity on ferromagnetism in the layered Ta/V/Fe{sub 1–x}V{sub x}/V/Fe{sub 1–x}V{sub x}/Nb/Si structures consisting of ferromagnetic and superconducting layers is studied using polarized neutron reflection and scattering. It is experimentally shown that magnetic structures with linear sizes from 5 nm to 30 μm are formed in these layered structures at low temperatures. The magnetization of the magnetic structures is suppressed by superconductivity at temperatures below the superconducting transition temperatures in the V and Nb layers. The magnetic states of the structures are shown to undergo relaxation over a wide magnetic-field range, which is caused by changes in the states of clusters, domains, and Abrikosov vortices.

Authors:
;  [1];  [2];  [1];  [3]; ;  [4];  [5]
  1. Joint Institute for Nuclear Research (Russian Federation)
  2. Helmholtz-Zentrum Berlin für Materialen un Energie (Germany)
  3. MTA Atomki, Institute for Nuclear Research (Hungary)
  4. Russian Research Centre Kurchatov Institute (Russian Federation)
  5. Russian Research Centre Kurchatov Institute, Konstantinov St. Petersburg Nuclear Physics Institute (Russian Federation)
Publication Date:
OSTI Identifier:
22617089
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 124; Journal Issue: 1; Other Information: Copyright (c) 2017 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABRIKOSOV THEORY; FERROMAGNETISM; IRON COMPOUNDS; LAYERS; MAGNETIC FIELDS; MAGNETIZATION; NEUTRONS; NIOBIUM; REFLECTION; RELAXATION; SCATTERING; SILICON; SUPERCONDUCTIVITY; TANTALUM; TRANSITION TEMPERATURE; VANADIUM; VANADIUM COMPOUNDS; VORTICES

Citation Formats

Zhaketov, V. D., Nikitenko, Yu. V., E-mail: nikiten@nf.jinr.ru, Radu, F., Petrenko, A. V., Csik, A., Borisov, M. M., Mukhamedzhanov, E. Kh., and Aksenov, V. L. Magnetism in structures with ferromagnetic and superconducting layers. United States: N. p., 2017. Web. doi:10.1134/S1063776116130227.
Zhaketov, V. D., Nikitenko, Yu. V., E-mail: nikiten@nf.jinr.ru, Radu, F., Petrenko, A. V., Csik, A., Borisov, M. M., Mukhamedzhanov, E. Kh., & Aksenov, V. L. Magnetism in structures with ferromagnetic and superconducting layers. United States. doi:10.1134/S1063776116130227.
Zhaketov, V. D., Nikitenko, Yu. V., E-mail: nikiten@nf.jinr.ru, Radu, F., Petrenko, A. V., Csik, A., Borisov, M. M., Mukhamedzhanov, E. Kh., and Aksenov, V. L. Sun . "Magnetism in structures with ferromagnetic and superconducting layers". United States. doi:10.1134/S1063776116130227.
@article{osti_22617089,
title = {Magnetism in structures with ferromagnetic and superconducting layers},
author = {Zhaketov, V. D. and Nikitenko, Yu. V., E-mail: nikiten@nf.jinr.ru and Radu, F. and Petrenko, A. V. and Csik, A. and Borisov, M. M. and Mukhamedzhanov, E. Kh. and Aksenov, V. L.},
abstractNote = {The influence of superconductivity on ferromagnetism in the layered Ta/V/Fe{sub 1–x}V{sub x}/V/Fe{sub 1–x}V{sub x}/Nb/Si structures consisting of ferromagnetic and superconducting layers is studied using polarized neutron reflection and scattering. It is experimentally shown that magnetic structures with linear sizes from 5 nm to 30 μm are formed in these layered structures at low temperatures. The magnetization of the magnetic structures is suppressed by superconductivity at temperatures below the superconducting transition temperatures in the V and Nb layers. The magnetic states of the structures are shown to undergo relaxation over a wide magnetic-field range, which is caused by changes in the states of clusters, domains, and Abrikosov vortices.},
doi = {10.1134/S1063776116130227},
journal = {Journal of Experimental and Theoretical Physics},
number = 1,
volume = 124,
place = {United States},
year = {Sun Jan 15 00:00:00 EST 2017},
month = {Sun Jan 15 00:00:00 EST 2017}
}
  • Ultrathin ferromagnetic Fe layers on Si(001) have recently been synthesized using the molecular beam epitaxy (MBE) technique, and their structural and magnetic properties, as well as their interface reactivity have been investigated. The study was undertaken as function of the amount of Fe deposited and of substrate temperature. The interface reactivity was characterized by Auger electron spectroscopy (AES). The surface structure was characterized by low-energy electron diffraction (LEED). The magnetism was investigated by magneto-optical Kerr effect (MOKE). A higher deposition temperature stabilizes a better surface ordering, but it also enhances Fe and Si interdiffusion and it therefore decreases the magnetism.more » Despite the rapid disappearance of the long range order with Fe deposition at room temperature, the material exhibits a significant uniaxial in-plane magnetic anisotropy. For the Fe deposition performed at high temperature (500 deg. C), a weak ferromagnetism is still observed, with saturation magnetization of about 10% of the value obtained previously. MOKE studies allowed inferring the main properties of the distinct formed layers.« less
  • Superconducting nucleation fields for ferromagnetic-superconducting-ferromagnetic ({ital M}/{ital S}/{ital M}) triple layers are calculated when the magnetic field is applied parallel to the {ital S}/{ital M} interfaces, the {ital S} layer is of arbitrary thickness {ital d}, and the {ital M} metals are identical and very thick. Both vortex and nonvortex nucleation are considered and the thickness {ital d}{sub cr} at which the vortices start to nucleate is determined. Since the superconductivity is significantly suppressed near the {ital S}/{ital M} interfaces, the thickness {ital d}{sub cr} substantially increases with respect to the case of a single {ital S} film.
  • Ferromagnetic interactions between imino nitroxides through Diamagnetic Metal Ions: Crystal Structures, Magnetism, and Electronic Properties of [M{sup I}(imino nitroxide){sub 2}](PF{sub 6}) (M = Cu{sup I} and Ag{sup I}) Cu(I) and Ag(I) complexes with imino nitroxides, [Cu{sup I}-(immepy){sub 2}](PF{sub 6}) and [Ag{sup I}(impy){sub 2}](PF{sub 6}), were structurally and magnetically characterized. Magnetic susceptibility and EPR measurements revealed that the magnetic interaction in the Cu(I) complex is ferromagnetic with a J value of 55.1(6) cm{sup -1} (g = 2.0 and H = -JS{sub 1}{center_dot}S{sub 2}), while the Ag(I) complex shows a very weak ferromagnetic interaction. The magnetic behaviors were discussed in terms ofmore » orthogonality of magnetic orbitals and metal to ligand charge-transfer interactions.« less
  • No abstract prepared.
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