168 citations · 1.4k across the 37 of their papers we have counts for
24 papers · 1 filter
Thermoelectric response of a ferroelectric insulator
Ryo Iguchi, Takashi Teranishi, Sakyo Hirose +4
Thermoelectric effects enable the conversion between heat and electricity without moving parts. While conventionally associated with mobile charges, we report thermoelectricity cau…
Direct measurement of electrocaloric effect based on multi-harmonic lock-in thermography
Ryo Iguchi, Daisuke Fukuda, Jun Kano +2
In this study, we report on a direct measurement method for the electrocaloric effect, the heating/cooling upon application/removal of an electric field in dielectric materials, ba…
Deposition temperature dependence of thermo-spin and magneto-thermoelectric conversion in CoMnGa films on YFeO and GdGaO
Hayato Mizuno, Rajkumar Modak, Takamasa Hirai +4
We have characterized CoMnGa (CMG) Heusler alloy films grown on YFeO (YIG) and GdGaO (GGG) substrates at different deposition temperatures and inv…
Temperature profile of the Thomson-effect-induced heat release/absorption in junctionless single conductors
Takahiro Chiba, Ryo Iguchi, Takashi Komine +2
The Thomson effect induces heat release or absorption under the simultaneous application of a charge current and a temperature gradient to conductors. Here, we theoretically invest…
Spintronic thermal management
Ken-ichi Uchida, Ryo Iguchi
In spin caloritronics, a branch of spintronics, the spin degree of freedom is exploited for thermoelectric conversion and thermal transport. Since the inception of spin caloritroni…
Phase-transition-induced giant Thomson effect for thermoelectric cooling
Rajkumar Modak, Masayuki Murata, Dazhi Hou +7
The Seebeck and Peltier effects have been widely studied and used in various thermoelectric technologies, including thermal energy harvesting and solid-state heat pumps. However, b…
High-throughput imaging measurements of thermoelectric figure of merit
Abdulkareem Alasli, Asuka Miura, Ryo Iguchi +2
We demonstrate a method for the simultaneous determination of the thermoelectric figure of merit of multiple martials by means of the lock-in thermography (LIT) technique. This met…
Local heat emission due to unidirectional spin-wave heat conveyer effect observed by lock-in thermography
Yuta Kainuma, Ryo Iguchi, Dwi Prananto +4
Lock-in thermography measurements were performed to reveal heat source distribution induced by the unidirectional spin-wave heat conveyer effect (USHCE) of magnetostatic surface sp…
Phenomenological analysis of transverse thermoelectric generation and cooling performance in magnetic/thermoelectric hybrid systems
Kaoru Yamamoto, Ryo Iguchi, Asuka Miura +4
We phenomenologically calculate the performance of the recently-observed Seebeck-driven transverse thermoelectric generation (STTG) for various systems in terms of the thermopower,…
Above-room-temperature giant thermal conductivity switching in spintronic multilayer
Hiroyasu Nakayama, Bin Xu, Sotaro Iwamoto +8
Thermal switching provides an effective way for active heat flow control, which has recently attracted increasing attention in terms of nanoscale thermal management technologies. I…
High-temperature dependence of anomalous Ettingshausen effect in SmCo-type permanent magnets
Asuka Miura, Keisuke Masuda, Takamasa Hirai +6
The anomalous Ettingshausen effect (AEE) in SmCo-type permanent magnets has been investigated in the high-temperature range from room temperature to around 600 K. The anomalous…
Spin-mediated charge-to-heat current conversion phenomena in ferromagnetic binary alloys
Asuka Miura, Ryo Iguchi, Takeshi Seki +2
Spin-mediated charge-to-heat current conversion phenomena, i.e., the anomalous Ettingshausen effect (AEE) and the anisotropic magneto-Peltier effect (AMPE), have been investigated…
Observation of anomalous Ettingshausen effect and large transverse thermoelectric conductivity in permanent magnets
Asuka Miura, Hossein Sepehri-Amin, Keisuke Masuda +7
This study focuses on the potential of permanent magnets as thermoelectric converters. It is found that a SmCo-type magnet exhibits the large anomalous Ettingshausen effect (AE…
Transient response of spin Peltier effect revealed by lock-in thermoreflectance measurement
Takumi Yamazaki, Ryo Iguchi, Tadakatsu Ohkubo +2
Transient response of the spin Peltier effect (SPE) in a Pt/yttrium iron garnet junction system has been investigated by means of a lock-in thermoreflectance method. We applied an…
Systematic Investigation of Anisotropic Magneto-Peltier Effect and Anomalous Ettingshausen Effect in Ni Thin Films
Raja Das, Ryo Iguchi, Ken-ichi Uchida
The anisotropic magneto-Peltier effect (AMPE) and anomalous Ettingshausen effect (AEE) have been investigated in U-shaped Ni thin films of varying thickness and substrate by means…
First-principles study of the anisotropic magneto-Peltier effect
Keisuke Masuda, Ken-ichi Uchida, Ryo Iguchi +1
We study theoretically the anisotropic magneto-Peltier effect, which was recently demonstrated experimentally. A first-principles-based Boltzmann transport approach including the s…
Thermographic measurements of spin-current-induced temperature modulation in metallic bilayers
R. Iguchi, A. Yagmur, Y. -C. Lau +4
Spin-to-heat current conversion effects have been investigated in bilayer films consisting of a paramagnetic metal (PM; Pt, W, or Ta) and a ferromagnetic metal (FM; CoFeB or permal…
High-throughput direct measurement of magnetocaloric effect based on lock-in thermography technique
Yusuke Hirayama, Ryo Iguchi, Xue-Fei Miao +2
We demonstrate a high-throughput direct measurement method for the magnetocaloric effect (MCE) by means of a lock-in thermography (LIT) technique. This method enables systematic me…
Magnetic-field-induced suppression of spin Peltier effect in Pt/ system at room temperature
Ryuichi Itoh, Ryo Iguchi, Shunsuke Daimon +3
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 ${\rm Y_{3}F…
Thermographic measurements of the spin Peltier effect in metal/yttrium-iron-garnet junction systems
Shunsuke Daimon, Ken-ichi Uchida, Ryo Iguchi +2
The spin Peltier effect (SPE), heat-current generation due to spin-current injection, in various metal (Pt, W, and Au single layers and Pt/Cu bilayer)/ferrimagnetic insulator (yttr…
Probing length-scale separation of thermal and spin currents by nanostructuring YIG
Asuka Miura, Takashi Kikkawa, Ryo Iguchi +3
We have fabricated bulk nanostructured ferrimagnetic materials with different grain sizes by sintering ball-milled Y3Fe5O12 (YIG) nanoparticles and measured the grain-size dependen…
Concomitant enhancement of longitudinal spin Seebeck effect with thermal conductivity
Ryo Iguchi, Ken-ichi Uchida, Shunsuke Daimon +1
We report a simultaneous measurement of a longitudinal spin Seebeck effect (LSSE) and thermal conductivity in a Pt/ (YIG)/Pt system in a temperature range…
Measurement of spin pumping voltage separated from extrinsic microwave effects
Ryo Iguchi, Eiji Saitoh
Conversions between spin and charge currents are core technologies in recent spintronics. In this article, we provide methods for estimating inverse spin Hall effects (ISHEs) induc…
Enhancement of Spin Pumping in Trilayer Film
Daichi Hirobe, Ryo Iguchi, Kazuya Ando +2
We study spin pumping in a trilayer film by means of the inverse spin Hall effect (ISHE). When the ferromagnets are not excited…