Nonlinear echoes, phase conjugation, time reversal, and electronic holography

Korpel, A.; Chatterjee, Monish Ranjan

doi:10.1109/proc.1981.12200

Cited by 32 publications

(13 citation statements)

References 38 publications

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“…Thus, it was shown that a dynamic magnonic crystal may provide a linear means to perform spectral transformations, including frequency inversion and time reversal, which, until now, have only been possible through nonlinear mechanisms [20,21,227,228]. These results go far beyond spin waves since they can be applied to waves of any nature.…”

Section: Frequency Inversion and Time Reversal Using Dynamic Magnonicmentioning

confidence: 99%

Magnonic crystals for data processing

Chumak

Serga

Hillebrands

2017

J. Phys. D: Appl. Phys.

423

320

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IntroductionThis article focuses on a selection of results in the field of magnonic crystals obtained within the last decade in our group. Special attention is devoted to the application of magnonic crystals in data processing and information technologies. Because of the large number of achievements in the field, it is unavoidable that many important results are excluded from this article. Therefore, we would like to direct the reader's attention to excellent reviews devoted to different aspects of magnonic crystals: spin-wave dynamics in periodic structures for microwave applications [1, 2], Brillouin light scattering (BLS) studies of planar metallic magnonic crystals [3], micromagnetic computer simulations of width-modulated waveguides [4], photo-magnonic aspects of antidot lattices studies [5], theoretical studies of one-dimensional monomode waveguides [6], and reconfigurable magnonic crystals [7]. The results presented in the current review were already partially presented in our own reviews of yttrium iron garnet (YIG) magnonics [8] and magnon spintronics [9] as well as in book chapters on dynamic magnonic crystals [10] and magnon spintronics [11].The article is organized in the following way: In the introduction we describe the field of magnon spintronics and discuss the role of magnonic crystals in it. The next section 2 is devoted to the properties of spin waves in thin planar films and waveguides, to the magnetic materials commonly used in the field, and to the methods of spin-wave excitation and detection. Sections 3 and 4 are devoted to the study of physical phenomena taking place in static and dynamic magnonic crystals, respectively. The application of magnonic crystals for magnonbased processing of analog and digital data is discussed in section 5. Specifically, static magnonic crystals can be used as passive elements, like microwave filters, resonators or delay lines for microwave generation. Reconfigurable and dynamic magnonic crystals are promising as active devices performing, for example, tunable filtering, frequency conversion or time reversal. In the final section we briefly summarize the results. Magnon spintronics: from electron-to magnon-based computingA disturbance in the local magnetic order can propagate in a magnetic material in the form of a wave. This wave was first predicted by Bloch in 1929 and was named spin wave since AbstractMagnons (the quanta of spin waves) propagating in magnetic materials with wavelengths at the nanometer-scale and carrying information in the form of an angular momentum can be used as data carriers in next-generation, nano-sized low-loss information processing systems. In this respect, artificial magnetic materials with properties periodically varied in space, known as magnonic crystals, are especially promising for controlling and manipulating magnon currents. In this article, different approaches for the realization of static, reconfigurable, and dynamic magnonic crystals are presented along with a variety of novel wave phenomena discovered in these cryst...

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Section: Frequency Inversion and Time Reversal Using Dynamic Magnonicmentioning

confidence: 99%

Magnonic crystals for data processing

Chumak

Serga

Hillebrands

2017

J. Phys. D: Appl. Phys.

423

320

View full text Add to dashboard Cite

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“…In practical experimental magnon systems, phase relaxation typically occurs on a timescale which is short in comparison with the characteristic energy decay time so that excitations of finite amplitude still exist after macroscopic coherence has been lost [129]. This leads to the possibility of re-forming signals from the residue of excitations created as they decohere; a process known as echo formation [129][130][131][132].…”

Section: Signal Storage and Recoverymentioning

confidence: 99%

“…This leads to the possibility of re-forming signals from the residue of excitations created as they decohere; a process known as echo formation [129][130][131][132].…”

Section: Signal Storage and Recoverymentioning

confidence: 99%

Magnon Spintronics

Karenowska

Chumak

Serga

et al. 2015

Handbook of Spintronics

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Presented here is an introduction to magnon spintronics, the emerging field of research concerned with structures and devices which involve the interconversion between electronic spin currents (spin currents carried by electrons) and magnon currents (spin angular momentum fluxes which do not involve the motion of charged carriers). Aimed at the nonexpert reader, the text reviews fundamental and applied aspects of magnonics and examines how the study of the interplay between magnonic and electronic spin transport both shines a light on new physics, and opens doors to new technologies.

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“…Although less well-known, echo phenomena can also be produced by another mechanism [37][38][39][40][41]. One possible mechanism relies on harmonic oscillators that interact in a nonlinear way with the excitation pulses, as in temperature quench echoes [42,43].…”

Section: Introductionmentioning

confidence: 99%

Echoes from anharmonic normal modes in model glasses

Burton

Nagel

2016

Phys. Rev. E

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Glasses display a wide array of nonlinear acoustic phenomena at temperatures T 1 K. This behavior has traditionally been explained by an ensemble of weakly-coupled, two-level tunneling states, a theory that is also used to describe the thermodynamic properties of glasses at low temperatures. One of the most striking acoustic signatures in this regime is the existence of phonon echoes, a feature that has been associated with two-level systems with the same formalism as spin echoes in NMR. Here we report the existence of distinctly different type of acoustic echo in classical models of glassy materials. Our simulations consist of finite-ranged, repulsive spheres and also particles with attractive forces using Lennard-Jones interactions. We show that these echoes are due to anharmonic, weakly-coupled vibrational modes, and perhaps provide an alternative explanation for the phonon echoes observed in glasses at low temperatures.

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Nonlinear echoes, phase conjugation, time reversal, and electronic holography

Cited by 32 publications

References 38 publications

Magnonic crystals for data processing

Magnonic crystals for data processing

Magnon Spintronics

Echoes from anharmonic normal modes in model glasses

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