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Orientation Control of Interfacial Magnetism at LaSrMnO/SrTiO Interfaces. | LitMetric

Orientation Control of Interfacial Magnetism at LaSrMnO/SrTiO Interfaces.

ACS Appl Mater Interfaces

Quantum Condensed Matter Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States.

Published: June 2017

AI Article Synopsis

Article Abstract

Understanding the magnetism at the interface between a ferromagnet and an insulator is essential because the commonly posited magnetic "dead" layer close to an interface can be problematic in magnetic tunnel junctions. Previously, degradation of the magnetic interface was attributed to charge discontinuity across the interface. Here, the interfacial magnetism was investigated using three identically prepared LaSrMnO (LSMO) thin films grown on different oriented SrTiO (STO) substrates by polarized neutron reflectometry. In all cases the magnetization at the LSMO/STO interface is larger than the film bulk. We show that the interfacial magnetization is largest across the LSMO/STO interfaces with (001) and (111) orientations, which have the largest net charge discontinuities across the interfaces. In contrast, the magnetization of LSMO/STO across the (110) interface, the orientation with no net charge discontinuity, is the smallest of the three orientations. We show that a magnetically degraded interface is not intrinsic to LSMO/STO heterostructures. The approach to use different crystallographic orientations provides a means to investigate the influence of charge discontinuity on the interfacial magnetization.

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Source
http://dx.doi.org/10.1021/acsami.7b03252DOI Listing

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