Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 443, Issue -, Pages 4-8Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2017.07.040
Keywords
Chromia thin films; Nonlinear magnetoelectric effect; Spin polarization; Spin-FET
Funding
- Nano Mission, DST India [SR/NM/NS-1198/2013]
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First-principle calculations are used to investigate how an external electric field controls the spin polarization in graphene on chromia, a system of interest in the area of spin field-effect transistors. Both freestanding chromia thin films and graphene-bilayers are considered. The effect of the electric field depends on the thickness of the chromia and ranges from moderately strong and linear effects to very strong nonlinear magnetoelectricity. The graphene modifies and generally enhances the nonlinear magnetoelectric effect. We also find that the external electric field drastically changes the energy-dependent spin polarization in the graphene layers, which is predicted to reach values of up to about 80%. (C) 2017 Elsevier B.V. All rights reserved.
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