Magnon polarons in the spin Peltier effect

Yahiro, Reimei; Kikkawa, Takashi; Ramos, Rafael; Oyanagi, Koichi; Hioki, Tomosato; Daimon, Shunsuke; Saitoh, Eiji

doi:10.1103/physrevb.101.024407

Cited by 28 publications

(18 citation statements)

References 47 publications

(98 reference statements)

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“…Analogous to polaritons formed from the photon and optical phonon hybridization in semiconductors [9], magnon polarons modify the dispersion of both magnons and phonons and thus affect the thermodynamic and transport properties of the materials. Theoretically proposed over six decades ago [10][11][12][13][14], magnon polarons have not been confirmed until recently in the spin Seebeck effect (SSE) and inelastic neutron scattering (INS) studies on ferrimagnetic insulators including yttrium iron garnet (YIG) [15][16][17][18][19] and Lu 2 BiFe 4 GaO 12 [20]. Unlike INS which requires large single crystal samples, SSE exploits pure spin currents carried by magnons; therefore, it is capable of probing small magnon-polaron anomalies in thin films.…”

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confidence: 99%

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Observation of Magnon Polarons in a Uniaxial Antiferromagnetic Insulator

Simensen

Reitz

et al. 2020

Phys. Rev. Lett.

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Magnon polarons, a type of hybridized excitations between magnons and phonons, were first reported in yttrium iron garnet as anomalies in the spin Seebeck effect responses. Here, we report an observation of antiferromagnetic (AFM) magnon polarons in a uniaxial AFM insulator Cr 2 O 3 . Despite the relatively higher energy of magnon than that of the acoustic phonons, near the spin-flop transition of ∼6 T, the lefthanded magnon spectrum shifts downward to hybridize with the acoustic phonons to form AFM magnon polarons, which can also be probed by the spin Seebeck effect. The spin Seebeck signal is founded to be enhanced due to the magnon polarons at low temperatures.

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confidence: 99%

“…1(d)] at certain wave vectors k's and energies E's. Just as in YIG [15][16][17][18][19], the AFM magnon polarons are expected to produce anomalies in SSE at specific magnetic fields corresponding to the touching points where the two dispersions are tangential to each other and the overlap regions are maximized in the E-k space.…”

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confidence: 99%

Observation of Magnon Polarons in a Uniaxial Antiferromagnetic Insulator

Simensen

Reitz

et al. 2020

Phys. Rev. Lett.

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“…Magnon-polarons could be formed in magnetic-ordered materials due to the strong magnetoelastic coupling between spin waves and lattice vibrations. Recently, a magnon-polarons-induced anomaly has been discovered in the spin Seebeck effect (SSE) of yttrium iron garnet (Y 3 Fe 5 O 12 : YIG) [7,8,11] and the spin Peltier effect of lutetium iron garnet [12]. Besides YIG, Fe 3 O 4 is a ferrimagnetic insulator with strong magnon-phonon coupling [13,14], which makes it a potentially suitable platform to investigate magnon-polarons.…”

Section: Introductionmentioning

confidence: 99%

Facet-dependent magnon-polarons in epitaxial ferrimagnetic Fe3O4 thin films

Xing

Yao

et al. 2020

Phys. Rev. B

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Magnon-polarons are coherently mixed quasiparticles that originate from the strong magnetoelastic coupling of lattice vibrations and spin waves in magnetic-ordered materials. Recently, magnon-polarons have attracted a lot of attention since they provide a powerful tool to manipulate magnons, which is essential for magnon-based spintronic devices. In this work, we report the experimental observation of facet-dependent magnon-polarons in epitaxial ferrimagnetic Fe 3 O 4 thin films via spin Seebeck effect measurement. The critical magnetic fields for the

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“…The magnon-phonon polaron induced anomalies in the SSE have been observed also for other magnetic insulators such as antiferromagnetic Cr2O3 [468] and (partially) compensated ferrimagnetic Lu2BiFe4GaO12 [60] and Gd3Ga5O12 [469]. In 2020, Yahiro et al reported that the anomalies show up also in the spin Peltier effect, the reciprocal of the SSE [470]. The formation of magnon-phonon polarons is predicted to affect magnonic spin conductivity and thermal conductivity [467], which await experimental discovery.…”

Section: Magnon-phonon Polaronmentioning

confidence: 84%

Advances in Magnetics Roadmap on Spin-Wave Computing

et al. 2022

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Magnonics addresses the physical properties of spin waves and utilizes them for data processing. Scalability down to atomic dimensions, operation in the GHz-to-THz frequency range, utilization of nonlinear and nonreciprocal phenomena, and compatibility with CMOS are just a few of many advantages offered by magnons. Although magnonics is still primarily positioned in the academic domain, the scientific and technological challenges of the field are being extensively investigated, and many proof-of-concept prototypes have already been realized in laboratories. This roadmap is a product of the collective work of many authors that covers versatile spin-wave computing approaches, conceptual building blocks, and underlying physical phenomena. In particular, the roadmap discusses the computation operations with Boolean digital data, unconventional approaches like neuromorphic computing, and the progress towards magnon-based quantum computing. The article is organized as a collection of sub-sections grouped into seven large thematic sections. Each sub-section is prepared by one or a group of authors and concludes with a brief description of current challenges and the outlook of further development for each research direction.

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Magnon polarons in the spin Peltier effect

Cited by 28 publications

References 47 publications

Observation of Magnon Polarons in a Uniaxial Antiferromagnetic Insulator

Observation of Magnon Polarons in a Uniaxial Antiferromagnetic Insulator

Facet-dependent magnon-polarons in epitaxial ferrimagnetic Fe3O4 thin films

Advances in Magnetics Roadmap on Spin-Wave Computing

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