Resonant amplification of intrinsic magnon modes and generation of new extrinsic modes in a two-dimensional array of interacting multiferroic nanomagnets by surface acoustic waves

De, Anulekha; Drobitch, Justine L.; Majumder, Sudip; Barman, Saswati; Bandyopadhyay, Supriyo; Barman, Anjan

doi:10.1039/d1nr01177d

Cited by 15 publications

(17 citation statements)

References 44 publications

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“…Interaction between spin waves and SAW has been studied in a wide variety of scenarios such as parametric amplification of spin waves via coupling to SAW. [ 4 , 5 ] Coupling between magnons and phonons was also studied, aided by extensive simulations. [ 6 , 7 , 8 ] Strong coupling leads to the formation of a hybridized magnon‐phonon quasi‐particle called a magnon polaron.…”

Section: Resultsmentioning

confidence: 99%

“…Both intrinsic and extrinsic modes were observed in ref. [ 4 ]. Third, the dominant peak power is about one order of magnitude higher in orientation 2 (SAW propagating along the major axis of the nanomagnets) than in orientation 1.…”

Section: Resultsmentioning

confidence: 99%

“…Whenever the dominant peak is at a frequency different from the excitation frequency of 5 GHz, the dominant mode is an intrinsic mode. The array has its own intrinsic spin‐wave modes determined by the nanomagnet and array parameters, [ 4 ] as stated previously. When a SAW excites an intrinsic mode, hybridization of the intrinsic mode with the extrinsic mode excited at the SAW frequency can create modes at other frequencies.…”

Section: Resultsmentioning

confidence: 99%

“…SAWs of frequencies in the range of 1-30 GHz are launched in the LiNbO 3 substrate by applying 1 dbm (1 mW) of power from the microwave source between a pair of electrodes. As mentioned earlier, we choose two different pairs (3,4) and (5,7) in Figure 1(b), which would launch SAWs propagating in two different directions. We label the two cases as "orientation 1" and "orientation 2", respectively.…”

Section: Spin Wave Nano-antennasmentioning

confidence: 99%

“…A surface acoustic wave (SAW) of ∼GHz frequency excites confined spin waves (of the same frequency) in the nanomagnets via the coupling of the phonons in the SAW to magnons in the spin‐wave. [ 4 ] The generated spin waves can then couple to electromagnetic radiative modes via magnon‐photon coupling, thereby radiating electromagnetic waves into the surrounding medium. This implements an electromagnetic antenna.…”

Section: Introductionmentioning

confidence: 99%

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Spin Wave Electromagnetic Nano‐Antenna Enabled by Tripartite Phonon‐Magnon‐Photon Coupling

et al. 2022

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Tripartite coupling between phonons, magnons, and photons in a periodic array of elliptical magnetostrictive nanomagnets delineated on a piezoelectric substrate to form a 2D two‐phase multiferroic crystal is investigated. Surface acoustic waves (SAW) (phonons) of 5–35 GHz frequency launched into the substrate cause the magnetizations of the nanomagnets to precess at the frequency of the wave, giving rise to confined spin‐wave modes (magnons) within the nanomagnets. The spin waves, in turn, radiate electromagnetic waves (photons) into the surrounding space at the SAW frequency. Here, the phonons couple into magnons, which then couple into photons. This tripartite phonon‐magnon‐photon coupling is thus exploited to implement an extreme sub‐wavelength electromagnetic antenna whose measured radiation efficiency and antenna gain exceed the approximate theoretical limits for traditional antennas of the same dimensions by more than two orders of magnitude at some frequencies. Micro‐magnetic simulations are in excellent agreement with experimental observations and provide insight into the spin‐wave modes that couple into radiating electromagnetic modes to implement the antenna.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Spin Wave Nano-antennasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spin Wave Electromagnetic Nano‐Antenna Enabled by Tripartite Phonon‐Magnon‐Photon Coupling

et al. 2022

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Acousto‐Plasmo‐Magnonics: Coupling Spin Waves with Hybridized Phonon‐Plasmon Waves in a 2D Artificial Magnonic Crystal Deposited on a Plasmonic Material

Pal

Fabiha

et al. 2023

Adv Funct Materials

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Coupling between spin waves (SWs) and other waves in nanostructured media has emerged as an important topic of research because of the rich physics and the potential for disruptive technologies. Herein, a new phenomenon is reported in this family involving coupling between SWs and hybridized phonon‐plasmon waves in a 2D periodic array of magnetostrictive nanomagnets deposited on a silicon substrate with an intervening thin film of aluminium that acts as a source of surface plasmons. Hybridized phonon‐plasmon waves naturally form in this composite material when exposed to ultrashort laser pulses and they non‐linearly couple with SWs to produce a new breed of waves – acousto‐plasmo‐spin waves that can exhibit a “frequency comb” spanning more than one octave. This phenomenon, that we call acousto‐plasmo‐magnonics resulting from tripartite coupling of magnons, phonons and plasmons, is studied with time‐resolved magneto‐optical‐Kerr‐effect microscopy. The findings also reveal the presence of parametric amplification in this system; energy is transferred from the hybridized phonon‐plasmon modes to the acousto‐plasmo‐spin wave modes to amplify the latter. This opens a path to design novel active metamaterials with tailored and enhanced response. It may enable high‐efficiency magneto‐mechanical‐plasmonic frequency mixing in the GHz−THz frequency regime and provide a unique avenue to study non‐linear coupling, parametric amplification, and frequency comb physics.

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Hybrid Straintronics and Magnonics

Bandyopadhyay

2022

Magnetic Straintronics

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Resonant amplification of intrinsic magnon modes and generation of new extrinsic modes in a two-dimensional array of interacting multiferroic nanomagnets by surface acoustic waves

Abstract: Using time-resolved magneto optical Kerr effect (TR-MOKE) microscopy, we demonstrate surface-acoustic-wave (SAW) induced resonant amplification of intrinsic spin-wave (SW) modes, as well as generation of new extrinsic or driven modes...

Cited by 15 publications

References 44 publications

Spin Wave Electromagnetic Nano‐Antenna Enabled by Tripartite Phonon‐Magnon‐Photon Coupling

Spin Wave Electromagnetic Nano‐Antenna Enabled by Tripartite Phonon‐Magnon‐Photon Coupling

Acousto‐Plasmo‐Magnonics: Coupling Spin Waves with Hybridized Phonon‐Plasmon Waves in a 2D Artificial Magnonic Crystal Deposited on a Plasmonic Material

Hybrid Straintronics and Magnonics

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