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.
, Kirby, B.
, , M.
, , C.
, , U.
, Suzuki, Y.
and Borchers, J.
Electric Field Control of Interfacial Ferromagnetism in CaMnO<sub>3</sub>/CaRuO<sub>3</sub> Heterostructures, Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=918184
(Accessed September 25, 2023)