Electric Field Control of Interfacial Ferromagnetism in CaMnO3/CaRuO3 Heterostructures

Published

July 24, 2015

Author(s)

Alexander J. Grutter, Brian J. Kirby, M. T. Gray, C. L. Flint, U. S. Alaan, Y. Suzuki, Julie A. Borchers

Abstract

A key milestone for the development of low-power spintronic devices is electric field control of ferromagnetism. To that end, we have probed the electric field dependence of the emergent ferromagntic layer at CaRuO₃/CaMnO₃ interfaces in bilayers fabricated on SrTiO₃. Using polarized neutron reflectometry, we are able to detect the ferromagnetic signal arising from a single atomic monolayer of CaMnO₃, manifested as a spin asymmetry in the reflectivity. We find that the application of an electric field of 600 kV/m across the bilayer induces a significant increase corresponds to a transition from canted antiferromagnetism to full ferromagnetic alignment of the Mn⁴⁺ ions at the interface. This increase from 1_υB to 3_υB per Mn is indicative of a strong magnetoelectric coupling effect, and such direct electric field control of the magnetization at an interface has significant potential for spintronic applications.

Citation

Physical Review Letters

Volume

115

Issue

4

Pub Type

Journals

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Keywords

Magnetoelectric, perovskite, magnetism, interface, oxide, reflectometry

Citation

Grutter, A. , Kirby, B. , , M. , , C. , , U. , Suzuki, Y. and Borchers, J. (2015), Electric Field Control of Interfacial Ferromagnetism in CaMnO₃/CaRuO₃ Heterostructures, Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=918184 (Accessed April 24, 2024)