Ferromagnetic resonance shifts from electric fields: Field-enhanced screening charge in ferromagnet/ferroelectric multilayers

Gunawan, V. and Stamps, R.L. (2012) Ferromagnetic resonance shifts from electric fields: Field-enhanced screening charge in ferromagnet/ferroelectric multilayers. Physical Review B, 85(10), (doi: 10.1103/PhysRevB.85.104411)

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Publisher's URL: http://dx.doi.org/10.1103/PhysRevB.85.104411

Abstract

We calculate standing spin wave frequencies in a multilayer which unit cell is a trilayer comprised of a ferromagnet, a ferroelectric, and a normal metal. An applied voltage enhances the polarization of the ferroelectric and increases the magnetic moment at one interface through spin polarization and charge transfer. We show that the induced surface magnetism results in shifts of resonance and standing spin wave mode frequencies. A new resonance peak is predicted, associated with a strongly localized surface moment. Estimates are provided using parameters appropriate to the ferroelectric BaTiO<sub>3</sub> and four different ferromagnetic metals, including a Heusler alloy (Fe, CrO<sub>2</sub>, permalloy, and Co<sub>2</sub>MnGe). The calculations use an entire-cell effective-medium approximation that takes into account the polarization profile in the ferroelectric. The metallic ferromagnetic electrode is treated as a real metal, and the depolarization field is included in the determination of polarization in the ferroelectric.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Stamps, Professor Robert
Authors: Gunawan, V., and Stamps, R.L.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review B
ISSN:1098-0121
ISSN (Online):1550-235X

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