A5082433985- Multiferroics and related materials
- Acoustic Wave Resonator Technologies
- Magnetic properties of thin films
- Ferroelectric and Piezoelectric Materials
- Energy Harvesting in Wireless Networks
- Magneto-Optical Properties and Applications
- Wireless Power Transfer Systems
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties and Applications
- Antenna Design and Analysis
- Quantum and electron transport phenomena
- Microwave Engineering and Waveguides
- Advanced MEMS and NEMS Technologies
- Non-Destructive Testing Techniques
- Perovskite Materials and Applications
- Gas Sensing Nanomaterials and Sensors
- Innovative Energy Harvesting Technologies
- Numerical methods in engineering
- Molecular Communication and Nanonetworks
- Mechanical and Optical Resonators
- Photonic Crystals and Applications
- Photoreceptor and optogenetics research
- Metamaterials and Metasurfaces Applications
- Photoacoustic and Ultrasonic Imaging
- Advanced Sensor and Energy Harvesting Materials
Northeastern University
2016-2022
Ferro (United States)
2017
Tsinghua University
2017
Arizona State University
2010
Abstract State-of-the-art compact antennas rely on electromagnetic wave resonance, which leads to antenna sizes that are comparable the wavelength. As a result, typically have size greater than one-tenth of wavelength, and further miniaturization has been an open challenge for decades. Here we report acoustically actuated nanomechanical magnetoelectric (ME) with suspended ferromagnetic/piezoelectric thin-film heterostructure. These ME receive transmit waves through effect at their acoustic...
Abstract Ultra-compact wireless implantable medical devices are in great demand for healthcare applications, particular neural recording and stimulation. Current technologies based on miniaturized micro-coils suffer from low power transfer efficiency (PTE) not always compliant with the specific absorption rate imposed by Federal Communications Commission. Moreover, current reliant differential of voltage or across space require direct contact between electrode tissue. Here, we show an...
We report a highly sensitive NEMS DC/low frequency magnetic field sensor consisting of an AlN/FeGaB resonator, with ΔE effect-based sensing principle. Unlike previously reported detection schemes, such as observing induced magnetoelectric voltage, or monitoring impedance, we designed system to directly measure the reflected output voltage from function field. The resonator shows resonance shift 3.19 MHz (1.44%), which leads high DC sensitivity 2.8 Hz/nT and limit 800pT in unshielded, room...
An electric current in the presence of spin-orbit coupling can generate a spin accumulation that exerts torques on nearby magnetization. We demonstrate that, even absence materials with strong bulk coupling, torque arise solely due to interfacial namely, Rashba-Eldestein effects at metal/insulator interfaces. In magnetically soft NiFe sandwiched between weak metal (Ti) and insulator (${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$), this appears as an effective field, which is significantly larger than...
A major obstacle during the design of brain- computer interfaces is unavailability a neural implantable device that μ-scale in size and wireless, self-powered, long-lasting. The current state-of-the-art devices suffer from various limitations. Electromagnetic-based wireless are big because their large antenna, which must be larger than one-tenth wavelength operational frequency. Ultrasound-based devices, addition to low data rate, have massive loss skull need an intermediate electromagnetic...
Giant nonreciprocity in a SAW-based microwave isolator device is reported offering substantial size and performance advantages.
The possibility of tuning the magnetic properties materials with voltage (converse magnetoelectricity) or generating electric fields (direct has opened new avenues in a large variety technological fields, ranging from information technologies to healthcare devices and including great number multifunctional integrated systems, such as mechanical antennas, magnetometers, radio frequency (RF) tunable inductors, which have been realized due strong strain-mediated magnetoelectric (ME) coupling...
Abstract Since the discovery of strong magnetoelectric (ME) coupling in two‐phase ME laminate composites, strain mediated heterostructures have found practical applications magnetic sensors, tunable inductors, filters, miniaturized antennas, memories, and nanoscale motors. Thin film particular, become promising candidates biomagnetic sensing, due to their high sensitivity, CMOS compatibility, room temperature operation, spatial resolution. In this article, an overview is presented on...
Abstract Magnetization dynamics induced by spin–orbit torques in a heavy‐metal/ferromagnet can potentially be used to design low‐power spintronics and logic devices. Recent computations have suggested that strain‐mediated torque (SOT) switching magnetoelectric (ME) heterostructures is fast, energy‐efficient, permits deterministic 180° magnetization switching. However, its experimental realization has remained elusive. Here, the coexistence of ME coupling SOT CoFeB/Pt/ferroelectric hybrid...
Lack of nonreciprocity---in particular, nonreciprocity phase accumulation---is one the major drawbacks microwave solid-state acoustic devices, which has prevented development isolators and circulators. Here we report observation hybridized surface waves (SAWs) spin in a magnetoelastic heterostructure. Our system consists $\text{Fe-Ga-B}/{\mathrm{Al}}_{2}{\mathrm{O}}_{3}/\text{Fe-Ga-B}$ multilayer on top ${\mathrm{LiNbO}}_{3}$ crystal. Maximum values observed nonreciprocal accumulation easily...
Antenna miniaturization is one of the fundamental challenges for decades [1]. Conventional small antennas use electric current radiation which relies on electromagnetic wave resonance that leads to antenna sizes comparable wavelength λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> . In 2017, we demonstrated a new mechanism [2] acoustically actuated nanome-chanical magnetoelectric (ME) with released ferromagnetic / piezoelectric thin...
Miniaturized piezoelectric/magnetostrictive contour-mode resonators have been shown to be effective magnetometers by exploiting the ΔE effect. With dimensions of ~100-200 μm across and <1 thick, they offer high spatial resolution, portability, low power consumption, cost. However, a thorough understanding magnetic material behavior in these devices has lacking, hindering performance optimization. This manuscript reports on strong, nonlinear correlation observed between frequency response...
We experimentally investigate spin-orbit torque and spin pumping in Y$_3$Fe$_5$O$_{12}$(YIG)/Pt bilayers with ultrathin insertion layers at the interface. An layer of Cu suppresses both pumping, whereas an Ni$_{80}$Fe$_{20}$ (permalloy, Py) enhances them, a quantitatively consistent manner reciprocity two transmission processes. However, we observe large enhancement Gilbert damping Py that cannot be accounted for solely by suggesting significant spin-memory loss due to interfacial magnetic...
We report the first study of diverse ferromagnetic thin films via acoustically driven resonance (ADFMR). Angle and field-dependent ADFMR was performed at room temperature on FeCo, FeCoGd, FeGaB, FeCoSiB, which take place Ni film traditionally used in these experiments, with a few exceptions. Surface acoustic wave (SAW) devices are operated three harmonics 0.8-2 GHz frequency range. Each magnetic material has unique signature: FeCo shows standard 4-lobe pattern broad ~100 mT linewidth; FeCoGd...
Antenna miniaturization is one of the fundamental challenges for decades [1]. Conventional small antennas use electric current radiation which relies on electromagnetic wave resonance that leads to antenna sizes comparable wavelength λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> . In 2017, we demonstrated a new mechanism [2] acoustically actuated nanomechanical magnetoelectric (ME) with released ferromagnetic / piezoelectric thin...
Abstract Ultra-compact wireless implantable medical devices (IMDs) are in great demand for healthcare applications, particular neural recording and stimulation. Current technologies based on miniaturized micro-coils suffer from low power transfer efficiency (PTE) not always compliant with the specific absorption rate imposed by Federal Communications Commission, particularly deep brain implantation where field attenuation tissue loss significant. Moreover, current reliant recordings of...
A novel acoustic noise dosimeter is presented in this letter to investigate and measure the sound level that damages human hearing. miniaturized magnetoelectric (ME) antenna utilized sense through nonlinear modulation around operating resonance frequency of 63.6 MHz. Applied 102 dBA at two different 300 kHz 1 frequencies results 33.8 dB 28.7 signal ratio. In addition, fabricated provides a high 2.49 GHz for energy harvesting communications.
This paper presents a miniaturized complementary-metal-oxide-semiconductor (CMOS) oscillator using microelectromechanical system (MEMS) resonating at 159 MHz frequency. The CMOS circuit is designed and simulated in 0.35μm XFAB technology. fabricated magnetoelectric (ME) sensor offers quality factor of 653. proposed provides phase noise as low -131.3 dBc/Hz 10kHz -137.9 100 kHz offset frequencies while consuming 2.24 mW power.