Magnetoelastic surface acoustic wave attenuation and anisotropic magnetoresistance in Ni3Fe thin films

Wiegert, R. F.

doi:10.1063/1.1452221

Cited by 6 publications

(7 citation statements)

References 13 publications

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“…Based on SAW magneto-transmission measurements with the static external magnetic field applied either perpendicular or parallel to the SAW propagation direction, these authors suggested that a magnetoelastic interaction most probably was the dominant interaction mechanism. However, conclusive evidence for the occurrence of an elastically driven, acoustic FMR has proven elusive, and important aspects of the interaction mechanism still await explanation, as stated by Wiegert as recently as 2002 [16].Our experimental study of SAW-based RF spin mechanics as a function of magnetic field magnitude and orientation provides clear evidence for elastically excited, acoustic ferromagnetic resonance. Our findings thus extend the application and understanding of magnetoelastic interaction phenomena in the RF regime.We study the hybrid device depicted schematically in Fig.…”

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confidence: 53%

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confidence: 99%

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Elastically Driven Ferromagnetic Resonance in Nickel Thin Films

et al. 2011

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Surface acoustic waves (SAWs) in the GHz frequency range are exploited for the all-elastic excitation and detection of ferromagnetic resonance (FMR) in a ferromagnetic-ferroelectric (Ni/LiNbO(3)) hybrid device. We measure the SAW magnetotransmission at room temperature as a function of frequency, external magnetic field magnitude, and orientation. Our data are well described by a modified Landau-Lifshitz-Gilbert approach, in which a virtual, strain-induced tickle field drives the magnetization precession. This causes a distinct magnetic field orientation dependence of elastically driven FMR that we observe in both model and experiment.

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confidence: 53%

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confidence: 99%

Elastically Driven Ferromagnetic Resonance in Nickel Thin Films

et al. 2011

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“…The physics of such heterostructures has been investigated experimentally. [20][21][22][23] Recently, it has been demonstrated that the observed changes of the complex magnetotransmission through a hybrid LiNbO 3 /Ni SAW delay line can be identified with absorption and dispersion signals of a SAW-driven ferromagnetic resonance (FMR). 24 We here use the term FMR synonymously with spin wave resonance (SWR), which is the more appropriate term if the ferromagnet is large compared with the acoustic wavelength and a spin wave mode is excited.…”

Section: Introductionmentioning

confidence: 99%

Surface acoustic wave driven ferromagnetic resonance in nickel thin films: Theory and experiment

Dreher¹,

Weiler²,

et al. 2012

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We present an extensive experimental and theoretical study of surface acoustic wave-driven ferromagnetic resonance. In a first modeling approach based on the Landau-Lifshitz-Gilbert equation, we derive expressions for the magnetization dynamics upon magnetoelastic driving that are used to calculate the absorbed microwave power upon magnetic resonance as well as the spin current density generated by the precessing magnetization in the vicinity of a ferromagnet/normal metal interface. In a second modeling approach, we deal with the backaction of the magnetization dynamics on the elastic wave by solving the elastic wave equation and the Landau-Lifshitz-Gilbert equation selfconsistently, obtaining analytical solutions for the acoustic wave phase shift and attenuation. We compare both modeling approaches with the complex forward transmission of a LiNbO3/Ni surface acoustic wave hybrid device recorded experimentally as a function of the external magnetic field orientation and magnitude, rotating the field within three different planes and employing three different surface acoustic wave frequencies. We find quantitative agreement of the experimentally observed power absorption and surface acoustic wave phase shift with our modeling predictions using one set of parameters for all field configurations and frequencies.

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“…Both kinds of delta-E effect sensors require an external or internal magnetic bias field to be operated at their optimum sensitivities. Besides sensor applications, the delta-E effect has been used for tunable SAW devices operating up to the GHz range [18,19,20,21,22,23,24].…”

Section: Introductionmentioning

confidence: 99%

Frequency Dependency of the Delta-E Effect and the Sensitivity of Delta-E Effect Magnetic Field Sensors

Spetzler

Голубева

Müller

et al. 2019

Sensors

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In recent years the delta-E effect has been used for detecting low frequency and low amplitude magnetic fields. Delta-E effect sensors utilize a forced mechanical resonator that is detuned by the delta-E effect upon application of a magnetic field. Typical frequencies of operation are from several kHz to the upper MHz regime. Different models have been used to describe the delta-E effect in those devices, but the frequency dependency has mainly been neglected. With this work we present a simple description of the delta-E effect as a function of the differential magnetic susceptibility χ of the magnetic material. We derive an analytical expression for χ that permits describing the frequency dependency of the delta-E effect of the Young’s modulus and the magnetic sensitivity. Calculations are compared with measurements on soft-magnetic (Fe90Co10)78Si12B10 thin films. We show that the frequency of operation can have a strong influence on the delta-E effect and the magnetic sensitivity of delta-E effect sensors. Overall, the delta-E effect reduces with increasing frequency and results in a stiffening of the Young’s modulus above the ferromagnetic resonance frequency. The details depend on the Gilbert damping. Whereas for large Gilbert damping the sensitivity continuously decreases with frequency, typical damping values result in an amplification close to the ferromagnetic resonance frequency.

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Magnetoelastic surface acoustic wave attenuation and anisotropic magnetoresistance in Ni3Fe thin films

Cited by 6 publications

References 13 publications

Elastically Driven Ferromagnetic Resonance in Nickel Thin Films

Elastically Driven Ferromagnetic Resonance in Nickel Thin Films

Surface acoustic wave driven ferromagnetic resonance in nickel thin films: Theory and experiment

Frequency Dependency of the Delta-E Effect and the Sensitivity of Delta-E Effect Magnetic Field Sensors

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