Magnetization control by angular momentum transfer from surface acoustic wave to ferromagnetic spin moments

Sasaki, R.; Nii, Yoichi

doi:10.1038/s41467-021-22728-6

Cited by 52 publications

(36 citation statements)

References 27 publications

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“…In the coupling process, phonon may carry spin information 14 . Nonreciprocal propagation of SAWs 15 – 19 is generated by the magnon–phonon coupling. Long-range transfer of angular momentum between two YIG layers separated by a thick substrate 20 is realized by the magnon–phonon coupling 21 .…”

Section: Introductionmentioning

confidence: 99%

Long decay length of magnon-polarons in BiFeO3/La0.67Sr0.33MnO3 heterostructures

Zhang

Chen

et al. 2021

Nat Commun

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Magnons can transfer information in metals and insulators without Joule heating, and therefore are promising for low-power computation. The on-chip magnonics however suffers from high losses due to limited magnon decay length. In metallic thin films, it is typically on the tens of micrometre length scale. Here, we demonstrate an ultra-long magnon decay length of up to one millimetre in multiferroic/ferromagnetic BiFeO3(BFO)/La0.67Sr0.33MnO3(LSMO) heterostructures at room temperature. This decay length is attributed to a magnon-phonon hybridization and is more than two orders of magnitude longer than that of bare metallic LSMO. The long-distance modes have high group velocities of 2.5 km s−1 as detected by time-resolved Brillouin light scattering. Numerical simulations suggest that magnetoelastic coupling via the BFO/LSMO interface hybridizes phonons in BFO with magnons in LSMO to form magnon-polarons. Our results provide a solution to the long-standing issue on magnon decay lengths in metallic magnets and advance the bourgeoning field of hybrid magnonics.

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Section: Introductionmentioning

confidence: 99%

Long decay length of magnon-polarons in BiFeO3/La0.67Sr0.33MnO3 heterostructures

Zhang

Chen

et al. 2021

Nat Commun

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“…The dipolar interaction has been studied in magnetism for many decades, but the analogy with the spin-orbit interaction in creating chirality was emphasized only recently. Recently, many theoretical predictions and experimental discoveries of chiral interactions among magnetic [47][48][49][50][51][52][53][54][55][56][57][58], photonic [59][60][61][62][63][64][65][66][67][68][69][70][71][72][73], phononic [74][75][76][77][78][79][80][81][82], electronic [83], and plasmonic [84][85][86][87][88][89] excitations in spintronics are revealed, which are found to mediate the excitation of quasiparticles into a single direction, leading to phenomena such as chiral spin pumping [50], chiral spin Seebeck [50], chiral phonon pumping by magnetization dynamics [74], magnon diodes <...…”

Section: Chirality As Generalized Spin-orbit Interactionmentioning

confidence: 99%

“…• Spin-momentum locking [15,16] • Phonon cavity [74] • Phonon diode [74][75][76][77][78][79][80][81][82] • Chiral pumping of spin waves [74,75,81] • Classical or quantum transducer…”

Section: Chiral Waves Features Functionalitiesmentioning

confidence: 99%

“…The displacements generated by an SAW propagating perpendicular to the wire with momentum ∥ ̂ are of the form ( ( , ), ( , )) and cause strains , and . We restrict the treatment here to in-plane magnetizations [76,77,79,80], saturated and controlled by a sufficiently strong magnetic field − 0 ̂ ′ with an angle between ′ with the wire. The equilibrium component ∼ − ̂ ′ is static, while the components + ′ ′ describe magnetic excitations.…”

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

confidence: 99%

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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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“…LiNbO 3 SAW devices also have found their usage in solid state physics, for example, SAW-driven quantized charge transport [53,54], the use of SAWs to control phonon angular momentum [55], the strong optomechanical coupling of individual quantum emitters and a surface acoustic wave [56], and quantum control of surface acoustic-wave phonons [57]. In integrated photonic systems, LiNbO 3 SAW resonators can be used to confine surface phonons [58].…”

Section: Surface Acoustic-wave Devicesmentioning

confidence: 99%

State of the Art in Crystallization of LiNbO3 and Their Applications

et al. 2021

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Lithium niobate (LiNbO3) crystals are important dielectric and ferroelectric materials, which are widely used in acoustics, optic, and optoelectrical devices. The physical and chemical properties of LiNbO3 are dependent on microstructures, defects, compositions, and dimensions. In this review, we first discussed the crystal and defect structures of LiNbO3, then the crystallization of LiNbO3 single crystal, and the measuring methods of Li content were introduced to reveal reason of growing congruent LiNbO3 and variable Li/Nb ratios. Afterwards, this review provides a summary about traditional and non-traditional applications of LiNbO3 crystals. The development of rare earth doped LiNbO3 used in illumination, and fluorescence temperature sensing was reviewed. In addition to radio-frequency applications, surface acoustic wave devices applied in high temperature sensor and solid-state physics were discussed. Thanks to its properties of spontaneous ferroelectric polarization, and high chemical stability, LiNbO3 crystals showed enhanced performances in photoelectric detection, electrocatalysis, and battery. Furthermore, domain engineering, memristors, sensors, and harvesters with the use of LiNbO3 crystals were formulated. The review is concluded with an outlook of challenges and potential payoff for finding novel LiNbO3 applications.

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Magnetization control by angular momentum transfer from surface acoustic wave to ferromagnetic spin moments

Cited by 52 publications

References 27 publications

Long decay length of magnon-polarons in BiFeO3/La0.67Sr0.33MnO3 heterostructures

Long decay length of magnon-polarons in BiFeO3/La0.67Sr0.33MnO3 heterostructures

Chirality as Generalized Spin-Orbit Interaction in Spintronics

State of the Art in Crystallization of LiNbO3 and Their Applications

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