Spin-Seebeck Effect: A Phonon Driven Spin Distribution

Jaworski, Christopher M.; Yang, Juan; Mack, Shawn; Awschalom, D. D.; Myers, Roberto C.; Heremans, Joseph P.

doi:10.1103/physrevlett.106.186601

Cited by 179 publications

(145 citation statements)

References 16 publications

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“…Furthermore, the phononmagnon drag has been found to be very important [70][71][72]. In magnetic insulators conventional thermoelectrics cannot be applied.…”

Section: Spin Seebeck Effectmentioning

confidence: 99%

Spin caloritronics

2012

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“…Furthermore, the phononmagnon drag has been found to be very important [70][71][72]. In magnetic insulators conventional thermoelectrics cannot be applied.…”

Section: Spin Seebeck Effectmentioning

confidence: 99%

Spin caloritronics

2012

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“…The spin Seebeck effect (SSE), which allows spin currents produced by thermal gradients in magnetic materials to be transmitted and converted to charge voltages in a heavy metal such as Pt, is one of the most technologically relevant thermoelectric phenomena to be used in 'spin caloritronic' devices [24][25][26][27][28][29]. In the case of a Pt film on the surface of a polished single-crystalline YIG slab (Pt/YIG) [ Fig.…”

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confidence: 99%

Direct observation of magnon-phonon coupling in yttrium iron garnet

Man

Shi

et al. 2017

Phys. Rev. B

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The magnetic insulator yttrium iron garnet (YIG) with a ferrimagnetic transition temperature of ∼560 K has been widely used in microwave and spintronic devices. Anomalous features in the spin Seeback effect (SSE) voltages have been observed in Pt/YIG and attributed to the magnon-phonon coupling. Here we use inelastic neutron scattering to map out low-energy spin waves and acoustic phonons of YIG at 100 K as a function of increasing magnetic field. By comparing the zero and 9.1 T data, we find that instead of splitting and opening up gaps at the spin wave and acoustic phonon dispersion intersecting points, magnon-phonon coupling in YIG enhances the hybridized scattering intensity. These results are different from expectations of conventional spin-lattice coupling, calling for new paradigms to understand the scattering process of magnon-phonon interactions and the resulting magnon-polarons.Spin waves (magnons) and phonons are propagating disturbance of the ordered magnetic moment and lattice vibrations, respectively. They constitute two fundamental quasiparticles in a solid and can couple together to form a hybrid quasiparticle [1,2]. Since our current understandings of these quasiparticles are based on linearized models that ignore all the high-order terms than quadratic terms and neglect interactions among the quasiparticle themselves [3], magnons and phonons are believed to be stable and unlikely to interact and breakdown for most purposes [4]. Therefore, discovering and understanding how the otherwise stable magnons and phonons can couple and interact with each other to influence the electronic properties of solids are one of the central themes in modern condensed matter physics.In general, spin-lattice (magnon-phonon) coupling can modify magnon in two different ways. First, the static lattice distortion induced by the magnetic order may affect the anisotropy of magnon exchange couplings, as seen in the spin waves of iron pnictides with large inplane magnetic exchange anisotropy [5]. Second, the dynamic lattice vibrations interact with time-dependent spin waves may give rise to significant magnon-phonon coupling [6,7]. One possible consequence of such coupling is to create energy gaps in the magnon dispersion at the nominal intersections of the magnon and phonon modes [8,9], as seen in antiferromagnet (Y,Lu)MnO 3 [10]. Alternatively, magnon-phonon coupling may give rise to spin-wave broadening at the magnon-phonon crossing points [11]. In both cases, we expect the integrated intensity of hybridized excitations at the intersecting points to be the sum of separate magnon and phonon scattering intensity without spin-lattice coupling [8]. Finally, if magnon and phonon lifetime-broadening is smaller than their interaction strength, the resulting mixed quasiparticles can form magnon polarons [6,7].Here we use inelastic neutron scattering to study lowenergy ferromagnetic magnons and acoustic phonons in the ferrimagnetic insulator yttrium iron garnet (YIG) with chemical formula -14]. At zero field and 100 K, we confir...

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“…Spin injection in silicon has also been demonstrated using spin Seebeck tunneling [8]. Spin-Seebeck effect [9] studies on permalloy/GaMnAs [10,11] clearly suggest phonon-driven spin redistribution. The critical question that arises from these studies is the role of spin polarization on transport behavior.…”

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confidence: 99%