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Hybrid YBa 2 Cu 3 O 7 Superconducting–Ferromagnetic Nanocomposite Thin Films Prepared from Colloidal Chemical Solutions
Author(s) -
Bartolomé Elena,
Cayado Pablo,
Solano Eduardo,
Mocuta Cristian,
Ricart Susagna,
Mundet Bernat,
Coll Marionna,
Gázquez Jaume,
Meledin Alexander,
van Tendeloo Gustaaf,
Valvidares S. Manuel,
HerreroMartín Javier,
Gargiani Pierluigi,
Pellegrin Eric,
Magén Cesar,
Puig Teresa,
Obradors Xavier
Publication year - 2017
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201700037
Subject(s) - materials science , ferromagnetism , nanocomposite , superparamagnetism , condensed matter physics , nucleation , superconductivity , flux pinning , heterojunction , ferrite (magnet) , magnetization , nanotechnology , high temperature superconductivity , magnetic field , optoelectronics , composite material , chemistry , physics , organic chemistry , quantum mechanics
High T c superconductor–ferromagnetic heterostructures constitute an appealing playground to study the interplay between flux vortices and magnetic moments. Here, the capability of a solution‐derived route to grow hybrid YBa 2 Cu 3 O 7 ‐ferromagnetic nanocomposite epitaxial thin films from preformed spinel ferrite (MFe 2 O 4 , M = Mn, Co) nanoparticles (NPs) is explored. The characterization, performed using a combination of structural and magnetic techniques, reveals the complexity of the resulting nanocomposites. Results show that during the YBCO growth process, most of the NPs evolve to ferromagnetic double‐perovskite (DP) phases (YBaCu 2− x − y Fe x Co y O 5 /YBaCoFeO 5 ), while a residual fraction of preformed ferrite NPs may remain in the YBCO matrix. Magnetometry cycles reflect the presence of ferromagnetic structures associated to the DPs embedded in the superconducting films. In addition, a superparamagnetic signal that may be associated with a diluted system of ferromagnetic clusters around complex defects has been detected, as previously observed in standard YBCO films and nanocomposites. The hybrid nanocomposites described in this work will allow studying several fundamental issues like the nucleation of superconductivity and the mechanisms of magnetic vortex pinning in superconducting/ferromagnetic heterostructures.