Applications of surface acoustic and shallow bulk acoustic wave devices

Campbell, Colin

doi:10.1109/5.40664

Cited by 112 publications

(42 citation statements)

References 291 publications

(395 reference statements)

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“…Surface and bulk acoustic wave (SAW, BAW) devices represent applications exploiting long wavelength lattice vibrations -"sound" -in microelectronics [279,280]. The operation is based on the coupling between electric fields and lattice vibrations in piezoelectric materials.…”

Section: Perspective and Applicationsmentioning

confidence: 99%

Nanophononics: state of the art and perspectives

et al. 2016

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Abstract. Understanding and controlling vibrations in condensed matter is emerging as an essential necessity both at fundamental level and for the development of a broad variety of technological applications. Intelligent design of the band structure and transport properties of phonons at the nanoscale and of their interactions with electrons and photons impact the efficiency of nanoelectronic systems and thermoelectric materials, permit the exploration of quantum phenomena with micro-and nanoscale resonators, and provide new tools for spectroscopy and imaging. In this colloquium we assess the state of the art of nanophononics, describing the recent achievements and the open challenges in nanoscale heat transport, coherent phonon generation and exploitation, and in nano-and optomechanics. We also underline the links among the diverse communities involved in the study of nanoscale phonons, pointing out the common goals and opportunities.

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Section: Perspective and Applicationsmentioning

confidence: 99%

Nanophononics: state of the art and perspectives

et al. 2016

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“…After substitution the equality ω=2µτ, and applying the identity 2τt=τ 2 +t 2 -(τ-t) 2 , and suitable factorization, the first equation is converted in a frequency-to-time scaling problem where with comparison to the equation (1), F(ω) and f(t) have been substituted by S(τ) and s(t) respectively. The last expression describes the full chirp algorithm.…”

Section: Compressive Receiver Conceptmentioning

confidence: 99%

“…The chirp transform is based on classical Fourier transform in which linear dependency between frequency and time (delay) has been introduced [1,2,4,8] . and…”

Section: Compressive Receiver Conceptmentioning

confidence: 99%

Intrapulse analysis of radar signal

Pieniezny

Konatowski

2009

WIT Transactions on Modelling and Simulation

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ELINT/ESM type of electronic intelligence in the primary layer uses parameters measurements of intercepted radar signals. Nowadays modern radar uses more and more complex waveforms. Some waveforms are developed intentionally to make their intercept almost impossible. The main distinctive features of modern radar signal are hidden in its time-frequency structure. In the near past the problem of radar signal feature extraction was considered in time or frequency domain separately, because radar waveforms were relatively simple. Today, however, the signals should be observed simultaneously in both domains. Timefrequency distribution concept offers a new approach in radar signals classification/identification. The paper presents some results of compressive concept and Hough transform application to intra-pulse modulation analysis of radar signals. Linear frequency modulation within the pulse was considered.

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“…First, in materials such as lithium niobate, SAWs can propagate distances $cm with little power loss. 31 Potentially, this would allow very large numbers of DWs/ devices to be controlled by a single transducer pair, making the approach attractive from the perspective of power efficiency. Second, in our approach, DWs are confined to pinning sites during their motion.…”

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confidence: 99%

A sound idea: Manipulating domain walls in magnetic nanowires using surface acoustic waves

Dean

Bryan

Cooper

et al. 2015

Applied Physics Letters

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We propose a method of pinning and propagating domain walls in artificial multiferroic nanowires using electrically induced surface acoustic waves. Using finite-element micromagnetic simulations and 1D semi-analytical modelling, we demonstrate how a pair of interdigitated acoustic transducers can remotely induce an array of attractive domain wall pinning sites by forming a standing stress/strain wave along a nanowire's length. Shifts in the frequencies of the surface acoustic waves allow multiple domain walls to be synchronously transported at speeds up to 50 ms À1 . Our study lays the foundation for energy-efficient domain wall devices that exploit the low propagation losses of surface acoustic waves to precisely manipulate large numbers of data bits. V C 2015 AIP Publishing LLC.[http://dx.doi.org/10.1063/1.4932057] Domain walls (DWs) in magnetic nanowires 1 have great technological potential through the development of "racetrack" memory devices. 2 In these devices, DWs separate magnetically bi-stable domains, the orientations of which represent binary data. Synchronously moving the DWs transports data along the nanowires, thus facilitating read/write operations.A major challenge in the development of racetrack memory has been finding efficient methods of transporting DWs. Although DWs in soft-ferromagnetic nanowires can be propagated at modest applied fields $10 Oe, 3 neighbouring DWs travel in opposite directions, making synchronous data transport impossible unless complex "ratcheted" nanowires 4,5 or field pulses with intricate spatial 6 or temporal profiles 7 are employed. Moving DWs via spin-torque effects is a more attractive approach, since neighbouring DWs travel uni-directionally. However, current-induced DW transport is inefficient and unreliable in soft ferromagnetic systems, 8,9 with complex multilayer nanowires exploiting spin-orbit effects [10][11][12] or containing antiferromagnetically coupled layers 13 being required to obtain fast and reliable DW motion at typical experimental current densities.Previously, we have shown that artificial multiferroic systems, where magnetostrictive nanowires are coupled to electrically contacted piezoelectric layers, offer alternative routes to obtaining synchronous DW motion. 14 In this approach, electrically induced strains in the piezoelectric layer produce local variations in the nanowire's magnetic anisotropy by the Villari effect. These can then be utilized to both pin and synchronously propagate DWs. The approach is attractive because it is voltage rather current driven, and thus is expected to be power efficient. Furthermore, in contrast to both field-and current-induced approaches, where interactions are impulse-based, in the multiferroic approach DWs are constantly confined within a stress-induced potential well, offering precise control of the DWs' positioning. However, the necessity of fabricating arrays of electrical contacts makes for complex device designs when compared to the simple, two-terminal configurations required for current-induced motion...

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Applications of surface acoustic and shallow bulk acoustic wave devices

Cited by 112 publications

References 291 publications

Nanophononics: state of the art and perspectives

Nanophononics: state of the art and perspectives

Intrapulse analysis of radar signal

A sound idea: Manipulating domain walls in magnetic nanowires using surface acoustic waves

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