Giant spin Seebeck effect in a non-magnetic material

Jaworski, Christopher M.; Myers, Roberto C.; Johnston-Halperin, Ezekiel; Heremans, Joseph P.

doi:10.1038/nature11221

Cited by 170 publications

(121 citation statements)

References 18 publications

Supporting

Mentioning

113

Contrasting

Unclassified

Order By: Relevance

“…[109]. Another theoretical question is the existence of the reverse of the spin Seebeck effect, namely, the spin Peltier effect, which is different from the spin-dependent Peltier effect [79] and could be interpreted as a kind of magnonic Peltier effect from the viewpoint of the present article.…”

Section: Conclusion and Future Prospectsmentioning

confidence: 80%

Theory of the spin Seebeck effect

et al. 2013

View full text Add to dashboard Cite

Abstract. The spin Seebeck effect refers to the generation of a spin voltage caused by a temperature gradient in a ferromagnet, which enables the thermal injection of spin currents from the ferromagnet into an attached nonmagnetic metal over a macroscopic scale of several millimeters. The inverse spin Hall effect converts the injected spin current into a transverse charge voltage, thereby producing electromotive force as in the conventional charge Seebeck device. Recent theoretical and experimental efforts have shown that the magnon and phonon degrees of freedom play crucial roles in the spin Seebeck effect. In this article, we present the theoretical basis for understanding the spin Seebeck effect and briefly discuss other thermal spin effects.

show abstract

Section: Conclusion and Future Prospectsmentioning

confidence: 80%

Theory of the spin Seebeck effect

et al. 2013

View full text Add to dashboard Cite

show abstract

“…As the spin dependence of the electrical conductivity proved to be important since it gives rise to GMR, the spin dependence of other transport parameters has been investigated, such as that of the Seebeck [11] and Peltier coefficients [12]. The combination of heat with spin and charge transport gained widespread attention owing to studies of the spin Seebeck effect [13,14]. The STT effect which uses a spinpolarized electrical current has shown promising applications, e.g., in magnetic memories (STT-MRAM).…”

mentioning

confidence: 99%

Thermal spin torques in magnetic insulators

Brechet

Che

et al. 2017

Phys. Rev. B

View full text Add to dashboard Cite

The damping of spin waves transmitted through a two-port magnonic device implemented on a yttrium iron garnet thin film is shown to be proportional to the temperature gradient imposed on the device. The sign of the damping depends on the relative orientation of the magnetic field, the wave vector, and the temperature gradient. The observations are accounted for qualitatively and quantitatively by using an extension of the variational principle that leads to the Landau-Lifshitz equation. All parameters of the model can be obtained by independent measurements. DOI: 10.1103/PhysRevB.95.104432 The discovery of giant magnetoresistance (GMR) revolutionized information storage technology [1,2] and the spin-transfer torque (STT), predicted two decades ago by Slonczewski [3] and Berger [4], may reshape once again the magnetic memory industry [5]. The concept of a heat-driven spin torque, or thermal spin-transfer torque (TST), has been suggested [6][7][8] and opened the world of spin caloritronics. Magnetic insulators are ideal for studying the fundamentals of spin caloritronics, because they are free of the effect of heat on charge transport. Here, we demonstrate that a spin torque can be induced in magnetic insulators by applying a thermal gradient. The effect is not linked to spin-dependent transport at interfaces since we observe a heat-driven contribution to damping of magnetization waves on a millimeter scale. We show that by adding to M(r) the bound magnetic current (∇ × M) as state variable, the variational principle that yields the Landau-Lifshitz equation predicts the presence of a thermal spin torque, from which we derive an expression for spin currents in insulators. Our experiments verify the key predictions of this model. Thermodynamics can predict a link between heat and magnetization, but cannot determine the strength of the effect [9].Spin caloritronics studies the interplay of spin, charge, and heat transport [10]. As the spin dependence of the electrical conductivity proved to be important since it gives rise to GMR, the spin dependence of other transport parameters has been investigated, such as that of the Seebeck [11] and Peltier coefficients [12]. The combination of heat with spin and charge transport gained widespread attention owing to studies of the spin Seebeck effect [13,14]. The STT effect which uses a spinpolarized electrical current has shown promising applications, e.g., in magnetic memories (STT-MRAM). It was already established that heat flowing through a ferromagnetic metal can generate a diffusive spin current [15] which induces a spin torque when flowing through a magnetic nanostructure [6]. Experimentally, this effect was studied in Co/Cu/Co spin valve nanowires by observing the change in the switching * haiming.yu@buaa.edu.cn † jean-philippe.ansermet@epfl.ch field of magnetization due to a local thermal gradient [7]. It was later shown that heat couples to magnetization dynamics [16][17][18]. The effect of heat on magnetization was also found in magnetic tunnel junctions [19] and...

show abstract

“…2,3 This epoch-making MI-based TE generation is initiated by a heat-mediated pure-spin-current creation in MIs, called the spin-Seebeck effect (SSE), [4][5][6][7][8][9][10][11][12][13][14] and then followed by the electric conversion via the inverse spin-Hall effect (ISHE) [15][16][17] in a paramagnetic metal adjacent to the MI. After the establishment of several theoretical frameworks for the SSE, 18,19 the exploration of SSE materials, materials exhibiting the SSE, is even more important for further understanding of the mechanism of the SSE as well as for highly-efficient TE generation.…”

mentioning

confidence: 99%

Observation of longitudinal spin-Seebeck effect in cobalt-ferrite epitaxial thin films

et al. 2015

View full text Add to dashboard Cite

The longitudinal spin-Seebeck effect (LSSE) has been investigated in cobalt ferrite (CFO), an exceptionally hard magnetic spinel ferrite. A bilayer of a polycrystalline Pt and an epitaxially-strained CFO(110) exhibiting an in-plane uniaxial anisotropy was prepared by reactive rf sputtering technique. Thermally generated spin voltage in the CFO layer was measured via the inverse spin-Hall effect in the Pt layer. External-magnetic-field (H) dependence of the LSSE voltage (VLSSE) in the Pt/CFO(110) sample with H ∥ [001] was found to exhibit a hysteresis loop with a high squareness ratio and high coercivity, while that with H∥[11̄0] shows a nearly closed loop, reflecting the different anisotropies induced by the epitaxial strain. The magnitude of VLSSE has a linear relationship with the temperature difference (ΔT), giving the relatively large VLSSE /ΔT of about 3 μV/K for CFO(110) which was kept even at zero external field.

show abstract

Giant spin Seebeck effect in a non-magnetic material

Cited by 170 publications

References 18 publications

Theory of the spin Seebeck effect

Theory of the spin Seebeck effect

Thermal spin torques in magnetic insulators

Observation of longitudinal spin-Seebeck effect in cobalt-ferrite epitaxial thin films

Contact Info

Product

Resources

About