Polarization screening-induced magnetic phase gradients at complex oxide interfaces

Steven R. Spurgeon, Prasanna V. Balachandran, Despoina M. Kepaptsoglou, Anoop R. Damodaran, J. Karthik, Siamak Nejati, Lewys Jones, Haile Ambaye, Valeria Lauter, Quentin M. Ramasse, Kenneth K. S. Lau, Lane W. Martin, James M. Rondinelli and Mitra L. Taheri ()
Additional contact information
Steven R. Spurgeon: Drexel University
Prasanna V. Balachandran: Drexel University
Despoina M. Kepaptsoglou: SuperSTEM, SciTech Daresbury Campus, Daresbury
Anoop R. Damodaran: University of California, Berkeley
J. Karthik: University of Illinois, Urbana-Champaign, Urbana, Illinois 61801, USA
Siamak Nejati: Drexel University
Lewys Jones: University of Oxford
Haile Ambaye: Neutron Sciences Directorate, Oak Ridge National Laboratory
Valeria Lauter: Neutron Sciences Directorate, Oak Ridge National Laboratory
Quentin M. Ramasse: SuperSTEM, SciTech Daresbury Campus, Daresbury
Kenneth K. S. Lau: Drexel University
Lane W. Martin: University of California, Berkeley
James M. Rondinelli: Northwestern University
Mitra L. Taheri: Drexel University

Nature Communications, 2015, vol. 6, issue 1, 1-11

Abstract: Abstract Thin-film oxide heterostructures show great potential for use in spintronic memories, where electronic charge and spin are coupled to transport information. Here we use a La0.7Sr0.3MnO3 (LSMO)/PbZr0.2Ti0.8O3 (PZT) model system to explore how local variations in electronic and magnetic phases mediate this coupling. We present direct, local measurements of valence, ferroelectric polarization and magnetization, from which we map the phases at the LSMO/PZT interface. We combine these experimental results with electronic structure calculations to elucidate the microscopic interactions governing the interfacial response of this system. We observe a magnetic asymmetry at the LSMO/PZT interface that depends on the local PZT polarization and gives rise to gradients in local magnetic moments; this is associated with a metal–insulator transition at the interface, which results in significantly different charge-transfer screening lengths. This study establishes a framework to understand the fundamental asymmetries of magnetoelectric coupling in oxide heterostructures.

Date: 2015
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DOI: 10.1038/ncomms7735

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