Microwave tunability in a GaAs-based multiferroic heterostructure: Co2MnAl/GaAs/PMN-PT

Abstract

A strong magnetoelectric (ME) interaction is presented in a magnetostrictive-semiconductor-piezoelectric heterostructure that consists of the Huesler alloy, Co2MnAl, GaAs, and lead magnesium niobate-lead titanate (PMN-PT). The laminated Co2MnAl/GaAs/PMN-PT structure, having a thickness of 19 nm/180 μm/500 μm, demonstrates a ferromagnetic resonance (FMR) field shift of 28 Oe with an external electric field of 200 V across the PMN-PT substrate. This corresponds to a resonance frequency shift of ∼125 MHz at X-band. It yields a large ME coupling (7 Oe cm/kV) and microwave tunability (∼32 MHz/kV cm−1), compared to other trilayer multiferroic composite structures. In addition, static magnetization measurement indicates a reduction in the remanence magnetization while applying the electric field, which corroborates the ME interactions mediated by the translation of magnetoelastic forces in this structure. This work explores the potential of multiferroic heterostrucuture transducers for use in FMR microwave devices tuned by electric fields.

Electric field control of microwave characteristics in composition-graded FeCoTa film grown onto [Pb(Mg1/3Nb2/3)O3]0.68-[PbTiO3]0.32(011) crystal

“…8,9 However, in most of those works, the variation of microwave properties with E-field was studied after poling the heterostructures. 19,20,30,32 There have been few studies focusing on the microwave properties of the samples in unpoled state in comparison with the poled state. 21 In this work, we investigate the dynamic permeability spectra and the static magnetization of a multiferroic FeCoTa/[Pb(Mg 1/3 Nb 2/3 )O 3 ] 0.68 -[PbTiO 3 ] 0.…”

Electrostatic tuning of ferromagnetic resonance and magnetoelectric interactions in ferrite-piezoelectric heterostructures grown by chemical vapor deposition

“…Earlier studies of this type primarily focused on epoxy bonded layered composites [5][6][7][8] or polycrystalline ferromagnetic films deposited on ferroelectric substrates. [9][10][11][12][13][14][15] Herein, we report on the converse ME effect in heteroepitaxial structures of nickel ferrite NiFe 2 O 4 (NFO) films directly grown onto (001)-oriented single crystal lead zinc niobate-lead titanate (PZN-PT) or lead magnesium niobatelead titanate (PMN-PT) substrates. Based on our previous theoretical work, a strong ME effect is expected in such structures because of the strong coupling resulting from high values of the magnetostriction and piezoelectric coefficients.…”

“…2 This work focuses on converse ME effects by electrostatic tuning of ferromagnetic resonance (FMR) in ferrite-ferroelectric composites. [5][6][7][8][9][10][11][12][13] The piezoelectric strain due to an electric field E manifests as an internal magnetic field in the ferromagnetic phase that causes a frequency shift Df or a field shift DH in the FMR or hybrid modes, with the strength of ME interaction A defined by A ¼ Df/E (or DH/E). Earlier studies of this type primarily focused on epoxy bonded layered composites [5][6][7][8] or polycrystalline ferromagnetic films deposited on ferroelectric substrates.…”

Giant magnetodielectric effect and magnetic field tunable dielectric resonance in spinel MnZn ferrite

“…Notwithstanding, this research may lead to many opportunities in the design of practical materials, heterostructures, and devices. 15,16 In this letter, we address a class of MD materials that can give rise to a giant dielectric response to applied magnetic fields. This kind of material, a polycrystalline MnZn-ferrite, consists of conductive grains separated by highly resistive grain boundary regions.…”