Antiferromagnetic Spin Seebeck Effect

Wu, Stephen M.; Zhang, Wei; Kc, Amit; Borisov, Pavel; Pearson, John; Jiang, J. S.; Lederman, David; Hoffmann, A.; Bhattacharya, Anand

doi:10.1103/physrevlett.116.097204

Cited by 303 publications

(269 citation statements)

References 47 publications

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“…The SSE has been observed not only in metals [1] and semiconductors [2], but also in magnetic insulators [3,[6][7][8][9][10][11][12][13][14][15][16][17][18]. Recently, related effects have also been observed in paramagnetic and antiferromagnetic materials [19][20][21]. Thus, the SSE effect is relevant for a large class of materials and it is of key importance to determine the effects of the spin current generated in the bulk of a material and the spin transport across its interface.…”

Section: Introductionmentioning

confidence: 99%

Influence of Thickness and Interface on the Low-Temperature Enhancement of the Spin Seebeck Effect in YIG Films

et al. 2016

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The temperature-dependent longitudinal spin Seebeck effect (LSSE) in heavy metal ðHMÞ=Y 3 Fe 5 O 12 (YIG) hybrid structures is investigated as a function of YIG film thickness, magnetic field strength, and different HM detection materials. The LSSE signal shows a large enhancement with reductions in temperature, leading to a pronounced peak at low temperatures. We find that the LSSE peak temperature strongly depends on the film thickness as well as on the magnetic field. Our result can be well explained in the framework of magnon-driven LSSE by taking into account the temperature-dependent effective propagation length of thermally excited magnons in the bulk of the material. We further demonstrate that the LSSE peak is significantly shifted by changing the interface coupling to an adjacent detection layer, revealing a more complex behavior beyond the currently discussed bulk effect. By direct microscopic imaging of the interface, we correlate the observed temperature dependence with the interface structure between the YIG and the adjacent metal layer. Our results highlight the role of interface effects on the temperature-dependent LSSE in HM/YIG system, suggesting that the temperature-dependent spin current transparency strikingly relies on the interface conditions.

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Section: Introductionmentioning

confidence: 99%

Influence of Thickness and Interface on the Low-Temperature Enhancement of the Spin Seebeck Effect in YIG Films

et al. 2016

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“…Similarly, for the same setup, the Seebeck coefficient S can be obtained by applying a temperature difference across the structure. We estimate that a temperature difference of ΔT ¼ 10 −3 K applied across a 10-nmthick AF results in a voltage ∼μV, which is in the range of that measured by [7]. (See third section of the Supplemental Material [17].)…”

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confidence: 99%

“…The solid purple or green curves correspond to H ranging from 0 to H c in increments of H c =10. At high temperatures, S grows larger with temperature, in contrast with [7,9]; see second section of Supplemental Material [17].…”

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confidence: 99%

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Enhanced Spin Conductance of a Thin-Film Insulating Antiferromagnet

et al. 2017

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We investigate spin transport by thermally excited spin waves in an antiferromagnetic insulator. Starting from a stochastic Landau-Lifshitz-Gilbert phenomenology, we obtain the out-of-equilibrium spin-wave properties. In linear response to spin biasing and a temperature gradient, we compute the spin transport through a normal-metal-antiferromagnet-normal-metal heterostructure. We show that the spin conductance diverges as one approaches the spin-flop transition; this enhancement of the conductance should be readily observable by sweeping the magnetic field across the spin-flop transition. The results from such experiments may, on the one hand, enhance our understanding of spin transport near a phase transition, and on the other be useful for applications that require a large degree of tunability of spin currents. In contrast, the spin Seebeck coefficient does not diverge at the spin-flop transition. Furthermore, the spin Seebeck coefficient is finite even at zero magnetic field, provided that the normal metal contacts break the symmetry between the antiferromagnetic sublattices.

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“…The symmetry of the resulting voltage signal with respect to the direction of the applied magnetic field is used as an indication of the ISHE. ISHE-based LSSE measurements have been reported for various insulators, e.g., ferrimagnetic garnets such as Y 3 Fe 5 O 12 (YIG) [14], Bi-substituted YIG [15] [24]. The experiments are typically reported as observations of the LSSE.…”

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confidence: 99%