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Electric Field Control of Interfacial Ferromagnetism in CaMnO3/CaRuO3 Heterostructures



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


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 1υB to 3υB 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.
Physical Review Letters


Magnetoelectric, perovskite, magnetism, interface, oxide, reflectometry


Grutter, A. , Kirby, B. , , M. , , C. , , U. , Suzuki, Y. and Borchers, J. (2015), Electric Field Control of Interfacial Ferromagnetism in CaMnO<sub>3</sub>/CaRuO<sub>3</sub> Heterostructures, Physical Review Letters, [online], (Accessed May 26, 2024)


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Created July 24, 2015, Updated February 19, 2017