Strain-induced magnetization control in an oxide multiferroic heterostructure

Controlling magnetism by using electric fields is a goal of research towards novel spintronic devices and future nanoelectronics. For this reason, multiferroic heterostructures attract much interest. Here we provide experimental evidence, and supporting density functional theory analysis, of a trans...

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Bibliographic Details
Published in:Physical review. B 2018-03, Vol.97 (9), Article 094423
Main Authors: Motti, Federico, Vinai, Giovanni, Petrov, Aleksandr, Davidson, Bruce A., Gobaut, Benoit, Filippetti, Alessio, Rossi, Giorgio, Panaccione, Giancarlo, Torelli, Piero
Format: Article
Language:English
Subjects:
Barium titanates
Density functional theory
Dichroism
Electric fields
Ferroelectric domains
Ferroelectric materials
Ferroelectricity
Ferromagnetic materials
Ferromagnetic phases
Heterostructures
Magnetic transitions
Magnetism
Multiferroic materials
Nanoelectronics
Substrates
Synchrotron radiation
Thin films
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Summary:Controlling magnetism by using electric fields is a goal of research towards novel spintronic devices and future nanoelectronics. For this reason, multiferroic heterostructures attract much interest. Here we provide experimental evidence, and supporting density functional theory analysis, of a transition in La0.65Sr0.35MnO3 thin film to a stable ferromagnetic phase, that is induced by the structural and strain properties of the ferroelectric BaTiO3 (BTO) substrate, which can be modified by applying external electric fields. X-ray magnetic circular dichroism measurements on Mn L edges with a synchrotron radiation show, in fact, two magnetic transitions as a function of temperature that correspond to structural changes of the BTO substrate. We also show that ferromagnetism, absent in the pristine condition at room temperature, can be established by electrically switching the BTO ferroelectric domains in the out-of-plane direction. The present results confirm that electrically induced strain can be exploited to control magnetism in multiferroic oxide heterostructures.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.97.094423