Thermal imaging of spin Peltier effect

Daimon, Shunsuke; Iguchi, Ryo; Hioki, Tomosato; Saitoh, Eiji; Uchida, K.

doi:10.1038/ncomms13754

Cited by 129 publications

(222 citation statements)

References 33 publications

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“…The torque increases or decreases the number of the magnons depending on the polarization of the torque (µ s m or µ s −m), and eventually changes the system temperature by energy transfer, concomitant with the spin-current injection [5,17,29]. The energy transfer induces observable temperature modulation in isolated systems, which satisfies the following relation…”

Section: Methodsmentioning

confidence: 99%

“…As revealed by the LIT experiments [17,19], the temperature modulation induced by the SPE is localized in the vicinity of N/F interfaces. This is the reason why the magnitude of the SPE signals is very small in the first experiment by Flipse et al [5], where a thermopile sensor is put on the bare YIG surface, not on the Pt/YIG junction.…”

Section: Introductionmentioning

confidence: 99%

“…The SSE has a reciprocal effect called the spin Peltier effect (SPE), discovered by Flipse et al in 2014 in a Pt/yttrium iron garnet (Y 3 Fe 5 O 12 : YIG) junction [5,17]. In the SPE, a spin current across a normal conductor (N)/ferromagnet (F) junction induces a heat current, which can change the temperature distribution around the junction system.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the experimental examination of the field dependence of the SPE is an important task for understanding the SPE. Although the SPE has recently been measured in various systems by using the lock-in thermography (LIT) [17], it is difficult to be used at high fields and/or low temperatures. For investigating the high-magnetic-field response of the SPE, an alternative method is required.…”

Section: Introductionmentioning

confidence: 99%

“…To reveal the mechanism of the SPE, systematic experiments have been conducted [17][18][19]. Since the SPE is driven by magnetic fluctuations (magnons) in the F layer, detailed study on the magnetic-field and temperature dependence is indispensable for clarifying the microscopic relation between the SPE and magnon excitation and the reciprocity between the SPE and SSE [20][21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic-field-induced decrease of the spin Peltier effect in Pt/Y3Fe5O12 system at room temperature

et al. 2017

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We report the observation of magnetic-field-induced suppression of the spin Peltier effect (SPE) in a junction of a paramagnetic metal Pt and a ferrimagnetic insulator Y 3 Fe 5 O 12 (YIG) at room temperature. For driving the SPE, spin currents are generated via the spin Hall effect from applied charge currents in the Pt layer, and injected into the adjacent thick YIG film. The resultant temperature modulation is detected by a commonly-used thermocouple attached to the Pt/YIG junction. The output of the thermocouple shows sign reversal when the magnetization is reversed and linearly increases with the applied current, demonstrating the detection of the SPE signal.We found that the SPE signal decreases with the magnetic field. The observed suppression rate was found to be comparable to that of the spin Seebeck effect (SSE), suggesting the dominant and similar contribution of the low-energy magnons in the SPE as in the SSE. * IGUCHI.Ryo@nims.go.jp 1 arXiv:1709.08997v1 [cond-mat.mtrl-sci]

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetic-field-induced decrease of the spin Peltier effect in Pt/Y3Fe5O12 system at room temperature

et al. 2017

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Enhanced Spin Seebeck Effect in Monolayer Tungsten Diselenide Due to Strong Spin Current Injection at Interface

Lee

Kikkawa

et al. 2020

Adv Funct Materials

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The spin current is significantly limited by the spin‐orbit interaction strength, material quality, and spin‐mixing conductance at material interfaces. Such limitations lead to spin current decay at the interfaces, which severely hinders potential applications in spin‐current‐generating thermoelectric devices. Thus, methodical studies on the enhancement of spin currents are indispensable. Herein, a novel approach for enhancing the spin current injected into a normal metal, Pt, using interface effects with a ferromagnetic insulator, yttrium iron garnet (YIG), is demonstrated. This is accomplished by inserting atomically thin monolayer (ML), tungsten diselenide (WSe2) between Pt and YIG layers. A comparative study of longitudinal spin Seebeck effect (LSSE) measurements is conducted. Two types of ML WSe2 (continuous and large‐area ML WSe2 and isolated ML WSe2 flakes) are used as intermediate layers on YIG film. Notably, the insertion of ML WSe2 between the Pt and YIG layers significantly enhances the thermopower, VLSSE/ΔT by a factor of approximately 5.6 compared with that of the Pt/YIG reference sample. This enhancement in the measured LSSE voltages in the Pt/ML WSe2/YIG trilayer can be explained by the increased spin‐to‐charge conversion at the interface owing to the large spin‐orbit coupling and improved spin mixing conductance with the ML WSe2 intermediate layer.

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Dynamic Electrical Pathway Tuning in Neuromorphic Nanowire Networks

Diaz-Alvarez

Iguchi

et al. 2020

Adv Funct Materials

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Neurobiology-inspired phenomena such as winner-takes-all competition and critical dynamics have been recently reported to arise in neuromorphic nanowire networks. These are unique systems where interactions between memristive elements creates emergent conductance pathways between discrete electrodes. This mode of operation can offer substantial advantages to create a truly concomitant plastic-static system for integration in neuromorphic devices. However, critical aspects such as pathway controllability and stability are yet to be explored. In this study, pathway formation in self-assembled neuromorphic networks formed by Ag nanowires decorated with TiO 2 nanoparticles is investigated. Direct visualization of pathway formation through a neuromorphic network is attained using the lock-in thermography technique. Using this technique, it is demonstrated that how networks preserve information from previously used pathways through increased local junction connectivity. This effect directly reshapes subsequent formation of pathways whenever the spatial location of the electrodes is dynamically changed. Combining these results with conventional current-voltage measurements, which show that the network electrically acts as a volatile switching memristor, a unique interaction between short-term and long-term memory arises. This produces unexpected collective dynamical states of potentiation and inhibition of network conductance whenever different spatiotemporal signals are dynamically fed to the network.

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Thermal imaging of spin Peltier effect

Cited by 129 publications

References 33 publications

Magnetic-field-induced decrease of the spin Peltier effect in Pt/Y3Fe5O12 system at room temperature

Magnetic-field-induced decrease of the spin Peltier effect in Pt/Y3Fe5O12 system at room temperature

Enhanced Spin Seebeck Effect in Monolayer Tungsten Diselenide Due to Strong Spin Current Injection at Interface

Dynamic Electrical Pathway Tuning in Neuromorphic Nanowire Networks

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