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Interface Magnetism in La 0.7 Ca 0.3 MnO 3 /PrBa 2 Cu 3 O 7 Epitaxial Heterostructures
Author(s) -
Cuellar Fabian A.,
HernandezMartin David,
Tornos Javier,
Gallego Fernando,
Orfila Gloria,
RiveraCalzada Alberto,
Sefrioui Zouhair,
Leon Carlos,
Santamaria Jacobo
Publication year - 2018
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201800265
Subject(s) - superexchange , manganite , condensed matter physics , magnetism , ferromagnetism , magnetic moment , heterojunction , spintronics , materials science , magnetic anisotropy , coupling (piping) , exchange bias , magnetic field , magnetization , physics , quantum mechanics , metallurgy
All oxide magnetic tunnel junctions based on epitaxial La 0.7 Ca 0.3 MnO 3 (LCMO)(8 nm)/PrBa 2 Cu 3 O 7 (PBCO) (3–8 nm)/LCMO(25–50 nm) heterostructures grown on (100) SrTiO 3 are examined. Manganite electrodes show large (bulk‐like) magnetic moments and exhibit different magnetic anisotropies with different easy axes directions. A form of low dimensional magnetism is induced at the interfaces by the superexchange interaction across the reconstructed bonds. It acts as an exchange spring, driving ferromagnetic coupling between the electrodes. Resistance versus magnetic field loops demonstrate that the interfacial coupling strength depends on electric field through its effect on electronic reconstruction and orbital hierarchy at the interface. The electrically controlled magnetic coupling between the magnetic moments of the electrodes signals a new path toward low dissipation spintronics.