Microwave magnetoelectric coupling and ferromagnetic resonance frequency tuning of a Co<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>MnSb/GaAs/PZN-PT heterostructure

We demonstrate strain-induced modulation of perpendicular magnetic anisotropy (PMA) in (001)-oriented [Pb(Mg1/3Nb2/3)O3](1−x)-[PbTiO3]x (PMN-PT) substrate/Ta/CoFeB/MgO/Ta structures using ferromagnetic resonance (FMR). An in-plane biaxial strain is produced by applying voltage between the two surfaces of the PMN-PT substrate, and is transferred to the ferromagnetic CoFeB layer, which results in tuning of the PMA of the CoFeB layer. The strain-induced change in PMA is quantitatively extracted from the experimental FMR spectra. It is shown that both first and second-order anisotropy terms are affected by the electric field, and that they have opposite voltage dependencies. A very large value of the voltage-induced perpendicular magnetic anisotropy modulation of ∼7000 fJ/V·m is obtained through this strain-mediated coupling. Using this FMR technique, the magnetostriction coefficient λ is extracted for the ultrathin 1.1 nm Co20Fe60B20 layer, and is found to be 3.7 × 10−5, which is approximately 4 times larger than the previously reported values for CoFeB films thicker than 5 nm. In addition, the effect of strain on the effective damping constant (αeff) is also studied and no obvious modulation of the αeff is observed. The results are relevant to the development of CoFeB-MgO magnetic tunnel junctions for memory applications.

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confidence: 99%

Strain-induced modulation of perpendicular magnetic anisotropy in Ta/CoFeB/MgO structures investigated by ferromagnetic resonance

Wang

Abolfath-Beygi

et al. 2015

“…In particular, the tuning of the ferromagnetic resonance (FMR) by electric field has been studied in numerous systems. [4][5][6][7][8] The motivation behind such studies is their promising potential for realizing a class of multiferroic microwave devices utilizing electric fields to control the magnetic properties. Here, we report on the electric field modulation of propagating spinwaves with non-zero k-vectors.…”

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confidence: 99%

Magneto-electric tuning of the phase of propagating spin waves

Bao

Zhu

Wong

et al. 2012

The utilization of a magnetoelectric film composite to control, by an electric field, the phase of magnetostatic surface spin waves propagating along thin films is reported. Laminates of ferromagnetic films of Ni and NiFe are deposited on a ferroelectric substrate, lead magnesium niobate-lead titanate. The phase of propagating spinwaves is shown to be modulated by an electric field while traveling a finite distance along the surface. The observed phase change in the spinwaves is in agreement with the anisotropy field changes measured with magneto optical Kerr effect hysteresis loops. A quantitative agreement is demonstrated. V

“…The FMR measurement indicates H A = 9.85 kOe, whereas the resonance frequency shift is calculated to be 250 MHz at X-band with respect to an E-field of 6 kV/cm, yielding a frequency tunability of 41.6 MHz/ kV cm −1 , which is comparable to other multiferroic structures operating in the range of 3-15 MHz/ kV cm −1 . 17,18 In order to obtain the tunablity of permeability controlled by an electric field applied across the PMN-PT slab, we must determine a relationship between permeability and magnetic field. Therefore, we deduce a mathematical relation describing the change in permeability with magnetic field.…”

Section: ͑2͒mentioning

confidence: 99%

Electronic tuning of magnetic permeability in Co2Z hexaferrite toward high frequency electromagnetic device miniaturization

Chen

Daigle

Fitchorov

et al. 2011

Self Cite

The magnetic and magnetostriction properties of Z-type cobalt-doped barium hexaferrite with perpendicular c-axis crystallographic texture are presented. The hexaferrite was utilized as a component in Co 2 Z/lead magnesium niobate-lead titanate multiferroic heterostructures whose tunability of permeability with electric field in terms of ferromagnetic resonance shift was supported by experiments and theoretical calculation. A permeability change of 16% was measured by an induced magnetic field of 38 Oe under the application of 6 kV/cm of electric field. These findings lay the foundation for the application of Z-type hexaferrites in tunable rf and microwave devices valued for sending, receiving, and manipulating electromagnetic signals.