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Article
Engineering, Electrical & Electronic
Vikrant J. Gokhale et al.
Summary: This letter presents the first demonstration of epitaxial scandium aluminum nitride (ScAlN) based high-overtone bulk acoustic resonators (epi-HBARs) with over 1600 acoustic cavity resonance modes spanning the X - Ka bands (8 GHz - 40 GHz). Key metrics for the ScAlN epi-HBARs include Q > 7000, fxQ > 10(14) Hz, and k(eff)(2) xQ(BVD) > 0.22 at cryogenic temperatures for frequencies as high as 40 GHz (>500, >6 x 10(12) Hz, >0.1 at room temperature). Such robust RF MEMS epi-HBARs with piezoelectric drive and readout are promising candidates for compact microwave/millimeter wave signal processing elements.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Brian P. Downey et al.
Summary: In this study, the micro-transfer printing technique is used to integrate two solid-state RF device technologies, GaN and GaAs high-electron-mobility transistors, on the same interposer. The devices are released from their growth substrate using an epitaxial sacrificial layer, and a thin polymer adhesion layer is used to ensure a strong bond with the target substrate. The results show that the device/interposer interface has no voids, and the polymer adhesion layer has a thickness of 5+/-2 nm. There is no significant degradation in dc electrical characteristics after device transfer for either device technology. The ability to combine different solid-state technologies at the device level with high density offers a promising approach for meeting the demands of next-generation RF and mixed-signal circuits.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Physics, Multidisciplinary
Tomosato Hioki et al.
Summary: This study reports the observation of coherent beating between phonons and magnons in a solid material. By using time-resolved magneto-optical microscopy, the researchers were able to observe the transition between phonons and magnons in Lu2Bi1Fe3.4Ga1.6O12. The experimental results provide a way for coherent control of magnon-phonon systems in solids, which is considered promising for information processing in the field of spintronics.
COMMUNICATIONS PHYSICS
(2022)
Article
Acoustics
Vikrant J. Gokhale et al.
Summary: This report demonstrates the first passive RF comb filters made using epi-HBAR technology, with multiple sharp filter passbands suitable for high-power RF operation, and potential to replace larger off-chip or discrete-component comb filters.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2021)
Article
Physics, Applied
A. Litvinenko et al.
Summary: A frequency-tunable low-phase-noise magnetoacoustic resonator is developed based on a parallel plate straight-edge bilayer consisting of a YIG layer grown on a GGG substrate. By selecting a specific acoustic thickness mode in the YIG-GGG structure and adjusting the FMR frequency of the YIG layer with an external magnetic field variation, a low-phase-noise composite magnetoacoustic oscillator can be achieved with tunable frequency range.
PHYSICAL REVIEW APPLIED
(2021)
Article
Physics, Applied
Jing Xu et al.
Summary: This letter investigates the simultaneous hybridization of multiple high-overtone bulk acoustic resonances with a magnon and a microwave mode, demonstrating coherent pulse echoes and opening opportunities for both fundamental studies and practical applications of hybrid magnonics.
PHYSICAL REVIEW APPLIED
(2021)
Article
Nanoscience & Nanotechnology
Yi Li et al.
Summary: The interaction between magnetic and acoustic excitations has inspired interdisciplinary studies that combine straintronics and spintronics, enabling the construction of on-chip coherent information processing networks. Recent progress in magnon-phonon coupled dynamic systems has highlighted features such as nonreciprocal acoustic wave propagation and strong coupling between magnons and phonons in magnetic thin-film systems, providing a platform for their coherent manipulation and transduction. Surface acoustic wave resonators are being explored for coherent quantum transduction, and novel acoustic circuit designs may have applications in microwave spintronics.
Article
Materials Science, Multidisciplinary
T. C. Fung et al.
Summary: The study introduces and experimentally demonstrates a method for broadband phonon-magnon interconversion by combining magnetoelastic coupling with translational symmetry breaking in YIG. This quasiparticle coupling mechanism has potential applications in hybrid solid-state quantum computing devices and low-power wave-based classical computing architectures.
MATERIALS FOR QUANTUM TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Vikrant J. Gokhale et al.
NATURE COMMUNICATIONS
(2020)
Article
Physics, Applied
Vikrant J. Gokhale et al.
APPLIED PHYSICS LETTERS
(2020)
Article
Engineering, Electrical & Electronic
Vikrant J. Gokhale et al.
JOURNAL OF MICROELECTROMECHANICAL SYSTEMS
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
Brian P. Downey et al.
2020 DEVICE RESEARCH CONFERENCE (DRC)
(2020)
Article
Materials Science, Multidisciplinary
K. An et al.
Article
Multidisciplinary Sciences
Mustafa Mert Torunbalci et al.
SCIENTIFIC REPORTS
(2018)
Article
Materials Science, Coatings & Films
Brian P. Downey et al.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2017)
Article
Engineering, Electrical & Electronic
Pratim Chowdhury et al.
IEEE MAGNETICS LETTERS
(2017)
Article
Nanoscience & Nanotechnology
N. I. Polzikova et al.
Article
Engineering, Electrical & Electronic
Pratim Chowdhury et al.
IEEE TRANSACTIONS ON MAGNETICS
(2015)
Proceedings Paper
Acoustics
Natalia Polzikova et al.
2013 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IUS)
(2013)
Proceedings Paper
Engineering, Electrical & Electronic
Sergey Alekseev et al.
2012 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IUS)
(2012)
Article
Acoustics
YX Zhang et al.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2003)