Piezoelectric-magnetoelastic surface wave guided by interface between semi-infinite piezoelectric and magnetoelastic media

Tsutsumi, M.; Bhattacharyya, T.; Kumagai, Naoya

doi:10.1063/1.322196

Cited by 17 publications

(6 citation statements)

References 6 publications

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“…[13][14][15][16][17][18][19][20][21][22][23] As the time-reversal symmetry is broken in a ferromagnet, the magneto-elastic (ME) interaction will cause non-reciprocal acoustic propagation. [24][25][26][27][28] This effect has been demonstrated for SAWs propagating along a LiNbO 3 substrate covered by a poly-crystalline Ni film. 14,15,20 However, the intrinsic structural disorder of poly-crystalline Ni leads to a magnetization response with a relatively large Gilbert damping coefficient α ∼ 0.05, 29 and therefore to wide ME resonances with weak non-reciprocal effects.…”

Section: Introductionmentioning

confidence: 79%

Large Nonreciprocal Propagation of Surface Acoustic Waves in Epitaxial Ferromagnetic/Semiconductor Hybrid Structures

et al. 2020

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Non-reciprocal propagation of sound, that is, the different transmission of acoustic waves traveling along opposite directions, is a challenging requirement for the realization of devices like acoustic diodes and circulators. Here, we demonstrate the efficient non-reciprocal transmission of surface acoustic waves (SAWs) propagating along opposite directions of a GaAs substrate coated with an epitaxial Fe 3 Si film. The non-reciprocity arises from the acoustic attenuation induced by the magneto-elastic (ME) interaction between the SAW strain field and spin waves in the ferromagnetic film, which depends on the relative angle between SAW propagation direction and magnetization.The acoustic transmission non-reciprocity, defined as the difference between the transmitted acoustic power for forward and backward propagation under ME resonance, reaches record values of up to 20%. The experimental results are well accounted for by a model for ME interaction, which also shows that non-reciprocity can be further enhanced by optimization of the sample design. These results make Fe 3 Si/GaAs a promising platform for the realization of efficient non-reciprocal SAW devices.

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Section: Introductionmentioning

confidence: 79%

Large Nonreciprocal Propagation of Surface Acoustic Waves in Epitaxial Ferromagnetic/Semiconductor Hybrid Structures

et al. 2020

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“…Fortunately, due to the magneto-elastic interaction in magnetostrictive materials, the SWs and acoustic waves can interact with each other, and SWs can act as a "source" of nonreciprocity for acoustic waves. The nonreciprocity of magneto-elastic waves [23][24][25], as well as the magneto-elastic interaction itself [26][27][28], were studied for a long time in the case of bulk samples. The bulk materials, however, typically do not show good acoustic, magnetic, magneto-elastic and piezoelectric properties simultaneously, which hinders their practical applications in nonreciprocal devices.…”

Section: Introductionmentioning

confidence: 99%

Nonreciprocal Surface Acoustic Waves in Multilayers with Magnetoelastic and Interfacial Dzyaloshinskii-Moriya Interactions

et al. 2018

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Surface acoustic waves (SAW) propagating in a piezoelectric substrate covered with a thin ferromagnetic/heavy metal bilayer are found to exhibit a substantial degree of nonreciprocity, i.e. the frequencies of these waves are non-degenerate with respect to the inversion of the SAW propagation direction. The simultaneous action of the magneto-elastic interaction in the ferromagnetic layer and the interfacial Dzyaloshinskii-Moriya interaction (IDMI) in the ferromagnetic/heavy metal interface, results in the openings of magneto-elastic bandgaps in the SAW spectrum, and the frequency position of these bandgaps are different for opposite SAW propagation directions. The bandgap widths and the frequency separation between them can be controlled by a proper selection of the magnetization angle and the thickness of the ferromagnetic layer. Using numerical simulations we demonstrate that the isolation between SAWs propagating in the opposite directions in such a system can exceed the direct SAW propagation losses by more than one order of magnitude.

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“…45(a), the surface acoustic waves hybridize with the spin waves only when their frequency and momentum match. The dipolar interaction is not active but the relativistic magnetoelastic coupling is chiral, i.e., it differs for positive and negative resonant momenta [81,[424][425][426][427][428]. The different anti-crossing gaps affect the propagation of surface acoustic waves in opposite directions [Fig.…”

Section: Chiral Magnon-phonon Interaction and Phonon Diodes: Theorymentioning

confidence: 99%

Chirality as Generalized Spin-Orbit Interaction in Spintronics

Chen¹,

Luo²,

Bauer³

2022

Preprint

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Chirality or handedness is a digital relation between three vectors that distinguishes an object from its mirror image, such as the spread fingers of the right and left hand. The chirality of ground state magnetic textures defined by the vectors of magnetization, its gradient, and an electric field from broken inversion symmetry can be fixed by a strong relativistic spin-orbit interaction. This review focuses on the chirality observed in the excited states of the magnetic order, dielectrics, and conductors that hold transverse spins when they are evanescent. Even without any relativistic effect, the transverse spin of the evanescent waves are locked to the momentum and the surface normal of their propagation plane. This chirality thereby acts as a generalized spin-orbit interaction, which leads to the discovery of various chiral interactions between magnetic, phononic, electronic, photonic, and plasmonic excitations in spintronics that mediate the excitation of quasiparticles into a single direction, leading to phenomena such as chiral spin and phonon pumping, chiral spin Seebeck, spin skin, magnonic trap, magnon Doppler, and spin diode effects. Intriguing analogies with electric counterparts in the nano-optics and plasmonics exist. After a brief review of the concepts of chirality that characterize the ground state chiral magnetic textures and chirally coupled magnets in spintronics, we turn to the chiral phenomena of excited states. We present a unified electrodynamic picture for dynamical chirality in spintronics in terms of generalized spin-orbit interaction and compare it with that in nano-optics and plasmonics. Based on the general theory, we subsequently review the theoretical progress and experimental evidence of chiral interaction, as well as the near-field transfer of the transverse spins, between various excitations in magnetic, photonic, electronic and phononic nanostructures at GHz time scales. We provide a perspective for future research before concluding this article.

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Piezoelectric-magnetoelastic surface wave guided by interface between semi-infinite piezoelectric and magnetoelastic media

Cited by 17 publications

References 6 publications

Large Nonreciprocal Propagation of Surface Acoustic Waves in Epitaxial Ferromagnetic/Semiconductor Hybrid Structures

Large Nonreciprocal Propagation of Surface Acoustic Waves in Epitaxial Ferromagnetic/Semiconductor Hybrid Structures

Nonreciprocal Surface Acoustic Waves in Multilayers with Magnetoelastic and Interfacial Dzyaloshinskii-Moriya Interactions

Chirality as Generalized Spin-Orbit Interaction in Spintronics

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