Colossal magnetoelectric effect induced by parametric amplification

Wang, Yi; Onuta, Tiberiu-Dan; Long, Christian J.; Geng, Yunlong; Takeuchi, Ichiro

doi:10.1063/1.4935332

Cited by 9 publications

(4 citation statements)

References 18 publications

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“…A number of nonlinear ME effects have also been observed for a large-field excitation of the heterostructures. Nonlinear effects are shown to occur due to the nonlinear dependence of magnetostriction λ of the FM layer on static magnetic field H, nonlinear dependence of the magnetization of the FM layer M on deformation S, and nonlinear dependence of deformation S of the PE layer on electric field E. Among the discovered nonlinear ME effects are frequency doubling and generation of higher harmonics of voltage [21] or magnetization [22], voltage generation with the sum and difference frequencies when the structure is excited by two different magnetic or electric harmonic fields [23][24][25], suppression of ME hysteresis in heterostructures [26], occurrence of bistability in a ME acoustic resonator [27], paramet-ric amplification of a signal when the heterostructure is pumped by an electric field with double frequency [28,29].…”

Section:   mentioning

confidence: 99%

Parametric Generation of Subharmonics in a Composite Multiferroic Resonator

et al. 2020

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Parametric generation of subharmonics in a composite multiferroic resonator has been observed and investigated. The resonator has the form of a disk and contains two mechanically coupled layers, one of which is amorphous ferromagnet FeBSiC and the other piezoelectric lead zirconate-titanate. The resonator was placed inside two planar electromagnetic coils with orthogonal axes. A static magnetic field of 0-100 Oe was applied parallel to the plane of the resonator. The resonator was excited in the frequency range f = 9-10 kHz by either a harmonic magnetic field with an amplitude of up to 5 Oe generated by one of the coils, or a harmonic electric field with an amplitude of up to 500 V/cm applied to the piezoelectric layer. When the pump field was above a certain threshold, generation of a subharmonic of half-frequency (f/2) was observed for three different excitation methods. The first two employed either the direct magnetoelectric effect or the converse magnetoelectric effect, while in the third a transformer system was utilised. The subharmonic was generated in a limited range of pump frequencies and its amplitude was a nonlinear function of both the pump-field amplitude and the strength of static magnetic field. A theory of parametric generation of the subharmonic in a multiferroic resonator has been developed, taking into account the magnetoacoustic nonlinearity of the ferromagnetic layer of the structure and excitation of acoustic resonances near the pump and subharmonic frequencies. The theory qualitatively describes the main characteristics of the subharmonic generation.

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Section:   mentioning

confidence: 99%

Parametric Generation of Subharmonics in a Composite Multiferroic Resonator

et al. 2020

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“…The origins of nonlinearity are the nonlinear dependence of the magnetostriction λ(H) and the magnetization M(H) of the FM layer on the dc magnetic field H, the nonlinear dependence of the polarization P(E) and deformation S(E) of the PE layer on the electric field E, as well as the nonlinear dependence of the elastic moduli of the layers on the magnetic and electric fields and mechanical stress [18][19][20]. Among the detected nonlinear ME effects, are the generation of harmonics [21,22] and sub-harmonics [23] of voltage or magnetization, generation of voltage or magnetization with the sum and difference frequencies when the structure is excited by two magnetic or electric ac fields [24,25], frequency mixing upon excitation of structures by electric and magnetic fields simultaneously [26], the onset of bistability in an ME resonator [27], excitation of acoustic oscillations under the action of magnetic field pulses [28], parametric amplification of oscillations upon excitation of heterostructures by an electric field [29], the nonlinear transformation of the magnetic noise spectrum in an ME heterostructure [30].…”

Section: Introductionmentioning

confidence: 99%

Noise generation in a bilayer ferromagnet-piezoelectric heterostructure at the converse magnetoelectric effect

Burdin¹,

Ékonomov²,

Preobrazhenskii³

et al. 2021

J. Phys. D: Appl. Phys.

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The paper describes first observation of parametric generation of noise in a composite multiferroic resonator. Resonator of a disk shape contains two mechanically coupled layers, one of which is the amorphous ferromagnet (FM) FeBSiC and the other is the piezoelectric (PE) lead zirconate titanate. DC magnetic field of 0–100 Oe is applied parallel to the plane of the resonator. Resonator is excited in the frequency range f = 2–10 kHz by a harmonic electric field with amplitude of up to 330 V cm−1 applied to the PE layer. Changes in the magnetization of the resonator caused by the converse magnetoelectric effect were recorded using an electromagnetic coil. With an increase in the excitation field to the threshold value, the parametric generation of harmonics and subharmonics with a discrete spectrum is observed, which then turns into a stochastic mode and a continuous spectrum of frequencies is generated. Noise density is hysterically dependent on the excitation field and non-monotonically depends on the dc magnetic field. Theory of parametric generation of the noise in a multiferroic resonator is developed, taking into account excitation of acoustic resonances and magnetoacoustic nonlinearity of the FM layer of the resonator. Theory, qualitatively describes the main characteristics of noise generation.

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“…When the composite was excited with short magnetic pulses of large amplitude, effects such as saturation of amplitude of the ME voltage and voltages at bending and longitudinal acoustic oscillations of the composite were observed [19]. A parametric amplification of the ME voltage at the frequency of acoustic resonance was observed when the composite was subjected to an electric field at double the resonance frequency [20,21].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear magnetoelectric effects at high magnetic field amplitudes in composite multiferroics

Fetisov

Burdin

Ékonomov

et al. 2018

J. Phys. D: Appl. Phys.

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Magnetoelectric effects (ME) in ferromagnetic-ferroelectric layered composites arise due to magnetostriction and piezoelectric effect in the ferroic phases and are mediated by mechanical strain. The ME coupling strength in such composites could be measured by electrical response to an applied ac magnetic field h and a bias magnetic field H. The coupling, in general, is linear for small ac field amplitudes, but one expects nonlinear ME interactions for high field strengths since the dependence of magnetostriction λ on magnetic fields is nonlinear. Here we report on nonlinear voltage response of a composite of ferromagnetic Metglas and piezoelectric lanthanum gallium tantalate (langatate) subjected to an ac and a bias magnetic fields, resulting in the generation of voltages at harmonics of the frequency of h. The dependences of the ME voltage of the first four harmonics on the magnetic fields for H = 0–20 Oe and h = 0–50 Oe were measured. Up to a hundred harmonics were observed in the voltage versus frequency spectra and was indicative of high nonlinearity of the ME coupling in the multiferroic structure. It is shown that for h smaller than the saturation magnetic field HS for magnetostriction in the ferromagnetic layer, the amplitudes of the ME voltages are proportional to the derivatives of λ with respect to H and show a power-law dependence on the pumping field amplitude An(H) ~ λ(n)(H)hn. We discuss a procedure for estimating the amplitudes of the harmonics for large pumping fields h, on the order of HS. The nonlinear ME effects in the composites are of interest for application in signal processing devices and highly sensitive magnetic field sensors.

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Colossal magnetoelectric effect induced by parametric amplification

Cited by 9 publications

References 18 publications

Parametric Generation of Subharmonics in a Composite Multiferroic Resonator

Parametric Generation of Subharmonics in a Composite Multiferroic Resonator

Noise generation in a bilayer ferromagnet-piezoelectric heterostructure at the converse magnetoelectric effect

Nonlinear magnetoelectric effects at high magnetic field amplitudes in composite multiferroics

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