Soft magnetism, magnetostriction, and microwave properties of FeGaB thin films

Lou, Jing; Insignares, R. E.; Cai, Zhuhua; Ziemer, Katherine S.; Liu, Ming; Sun, Nian X.

doi:10.1063/1.2804123

Cited by 160 publications

(86 citation statements)

References 19 publications

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“…In addition to electrical control of microwave performance in ferrite/ferroelectric heterostructures, metallic/ferroelectric microwave heterostructures also have been studied. Most recently, we reported a new class of microwave magnetic thin-film materials, FeGaB films, which have large magnetostriction constant and low saturation fields desired for multiferroic composite applications [38]. With changing the B doping level, amorphous phase FeGaB was produced and led to excellent magnetic softness with coercivity less than 1 Oe, narrow FMR linewidth of [16][17][18][19][20] Oe at X-band (9.6 GHz), large λ s of 50-70 ppm, high saturation magnetization of 11-15 kG, and a self-biased FMR frequency of 1.85 GHz.…”

mentioning

confidence: 99%

Voltage control of magnetism in multiferroic heterostructures

Liu

Sun

2014

Phil. Trans. R. Soc. A.

131

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Electrical tuning of magnetism is of great fundamental and technical importance for fast, compact and ultra-low power electronic devices. Multiferroics, simultaneously exhibiting ferroelectricity and ferromagnetism, have attracted much interest owing to the capability of controlling magnetism by an electric field through magnetoelectric (ME) coupling. In particular, strong strain-mediated ME interaction observed in layered multiferroic heterostructures makes it practically possible for realizing electrically reconfigurable microwave devices, ultra-low power electronics and magnetoelectric random access memories (MERAMs). In this review, we demonstrate this remarkable E-field manipulation of magnetism in various multiferroic composite systems, aiming at the creation of novel compact, lightweight, energy-efficient and tunable electronic and microwave devices. First of all, tunable microwave devices are demonstrated based on ferrite/ferroelectric and magnetic-metal/ferroelectric composites, showing giant ferromagnetic resonance (FMR) tunability with narrow FMR linewidth. Then, E-field manipulation of magnetoresistance in multiferroic anisotropic magnetoresistance and giant magnetoresistance devices for achieving low-power electronic devices is discussed. Finally, E-field control of exchange-bias and deterministic magnetization switching is demonstrated in exchange-coupled antiferromagnetic/ferromagnetic/ferroelectric multiferroic hetero-structures at room temperature, indicating an important step towards MERAMs. In addition, recent progress in electrically non-volatile tuning of magnetic states is also presented. These tunable multiferroic heterostructures and devices provide great opportunities for next-generation reconfigurable radio frequency/microwave communication systems and radars, spintronics, sensors and memories.

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confidence: 99%

Voltage control of magnetism in multiferroic heterostructures

Liu

Sun

2014

Phil. Trans. R. Soc. A.

131

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“…Unlike the situation when magnetic fields are used for such tuning, the voltage tuning process is fast, and power efficient as the biasing voltages involve minimal currents and are nearly passive. This process has been demonstrated in voltage tunable bandpass filters, 27 voltage tunable bandstop filters, 26 voltage tunable delay lines, 93 and voltage tunable inductors. 23 Figure 30 shows the schematic of such a voltage tunable ferromagnetic resonance based tunable bandstop filter.…”

Section: Voltage Tunable Magneto-electric Rf/microwave/millimeter Wavmentioning

confidence: 99%

“…Magnetic-piezoelectric heterostructures with strong converse ME coupling leads to effective voltage control of magnetism [93][94][95][96][97] such as voltage tunable magnetic hysteresis loops, 96 voltage tunable permeability, 98 and voltage control of ferromagnetic resonance (FMR) frequency. [97][98][99][100][101][102][103][104][105][106][107][108] A giant voltage tunable ferromagnetic resonance frequency from 1.7 to 7.6 GHz observed in FeGaB/PZN-PT (lead zinc niobatelead titanate) is shown in Figure 29.…”

Section: Voltage Tunable Magneto-electric Rf/microwave/millimeter Wavmentioning

confidence: 99%

Challenges and opportunities for multi-functional oxide thin films for voltage tunable radio frequency/microwave components

Subramanyam¹,

Cole²,

Sun³

et al. 2013

Journal of Applied Physics

144

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There has been significant progress on the fundamental science and technological applications of complex oxides and multiferroics. Among complex oxide thin films, barium strontium titanate (BST) has become the material of choice for room-temperature-based voltage-tunable dielectric thin films, due to its large dielectric tunability and low microwave loss at room temperature. BST thin film varactor technology based reconfigurable radio frequency (RF)/microwave components have been demonstrated with the potential to lower the size, weight, and power needs of a future generation of communication and radar systems. Low-power multiferroic devices have also been recently demonstrated. Strong magneto-electric coupling has also been demonstrated in different multiferroic heterostructures, which show giant voltage control of the ferromagnetic resonance frequency of more than two octaves. This manuscript reviews recent advances in the processing, and application development for the complex oxides and multiferroics, with the focus on voltage tunable RF/microwave components. The over-arching goal of this review is to provide a synopsis of the current state-of the-art of complex oxide and multiferroic thin film materials and devices, identify technical issues and technical challenges that need to be overcome for successful insertion of the technology for both military and commercial applications, and provide mitigation strategies to address these technical challenges. V C 2013 AIP Publishing LLC.

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“…Magnetostrictive materials are currently of great interest due to their application potential in sensors and actuators [1][2][3]. Highly magnetostrictive materials are useful for ultrasound generators, magnetostrictive optical wavelength tuners and magnetostrictive delay lines [4].…”

Section: Introductionmentioning

confidence: 99%

Metglas thin film based magnetostrictive transducers for use in long period fibre grating sensors

Thomas

Mathew

Radhakrishnan

et al. 2010

Sensors and Actuators A: Physical

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a b s t r a c tMetallic glass alloy Metglas 2826 MB based amorphous magnetic thin films were fabricated by the thermal evaporation technique. Transmission electron micrographs and electron diffraction pattern showed the amorphous nature of the films. Composition of the films was analyzed employing X-ray photoelectron spectroscopy and energy dispersive X-ray spectroscopy techniques. The film was integrated to a long period fibre grating. It was observed that the resonance wavelength of the fibre grating decreased with an increase in the magnetic field. Change in the resonance wavelength was minimal at higher magnetic fields. Field dependent magnetostriction values revealed the potential application of these films in magnetostrictive sensor devices.

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Soft magnetism, magnetostriction, and microwave properties of FeGaB thin films

Cited by 160 publications

References 19 publications

Voltage control of magnetism in multiferroic heterostructures

Voltage control of magnetism in multiferroic heterostructures

Challenges and opportunities for multi-functional oxide thin films for voltage tunable radio frequency/microwave components

Metglas thin film based magnetostrictive transducers for use in long period fibre grating sensors

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