Polarization screening-induced magnetic phase gradients at complex oxide interfaces.

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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Spurgeon SR,Balachandran PV,Kepaptsoglou DM,Damodaran AR,Karthik J,Nejati S,Jones L,Ambaye H,Lauter V,Ramasse QM,Lau KKS,Martin LW,Rondinelli JM,Taheri ML

doi

10.1038/ncomms7735

subject

Has Abstract

pub_date

2015-04-16 00:00:00

pages

6735

issn

2041-1723

pii

ncomms7735

journal_volume

6

pub_type

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