Abstract
A new type of multiferroic heterostructure has been proposed in this work with strong electric field tuning of magnetism. It is composed of a self-biased magnetic layered structure with perpendicular magnetic anisotropy (PMA) and one piezoelectric substrate. Two configurations were investigated by a modeling approach, Ni/Ni/Ni/PMN-PT with Cu as spacer and Terfenol-D/CoFeB/Ni/PMN-PT. Magnetic multilayers at their resonance exhibit multiple absorption peaks from acoustic and optical modes of spin interaction between adjacent magnetic layers. A piezoelectric substrate transfers electric field induced strain to adjacent magnetic layer and thus shifts resonance frequencies of the multiferroic structure by tuning magnetic effective fields through magnetoelastic coupling. It has been demonstrated computationally that the resonance frequencies for the simulated structures could be up to 76 GHz under zero magnetic bias field. A larger tunability (> 100%) is achieved with applied electric field to the PMN-PT [011] substrate. Resonance mode selectivity is present in the configuration Terfenol-D/CoFeB/Ni/PMN-PT wherein one desired mode exhibits a much higher tunability compared to other modes. This enables the total mode number to be tuned by merging or diverging different modes under E-field.
Highlights
A new type of multiferroic heterostructure has been proposed in this work with strong electric field tuning of magnetism
An external bias field along the in-plane direction is required in bulk magnetic materials in order to obtain a quasi-single-domain magnetic state, which is critical to achieving a significant absorption peak in ferromagnetic resonance (FMR) a pplication[5,15]
perpendicular magnetic anisotropy (PMA) arises from surface anisotropy of magnetic materials, which is inversely proportional to film thickness
Summary
A new type of multiferroic heterostructure has been proposed in this work with strong electric field tuning of magnetism. A piezoelectric substrate transfers electric field induced strain to adjacent magnetic layer and shifts resonance frequencies of the multiferroic structure by tuning magnetic effective fields through magnetoelastic coupling. Electric field induced strain in ferroelectric layer modulates the effective magnetic field in adjacent magnetic layers by magnetoelastic coupling and tunes the center frequency of multiferroic structures This characteristic can be used to design a voltage tuning filters, tunable phase shifters, tunable inductors, etc. Considerable efforts have been directed at investigating single layer magnetic film on top of a piezoelectric substrate, such as FeGaB/PZN-PT1, BaFe12O19/Ba0.5Sr0.5TiO32, BaFe12O19/PMN-PT3, FeGaB/PZNPT4, YIG/PMN-PT5 These experiments observed mainly one significant absorption peak on magnetic materials which can be tuned by applied electric field. This proposed multimode tunable structure has a broad potential application in the communication system which is able to meet various design requirements with desired filter band number, large frequency tunability (> 100%) and tuned frequency band selectivity
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