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Observation of orbital-angular-momentum-driven temperature modulation via the spin Peltier effect
Sang J. Park, Tsuneyoshi Kan, Takamasa Hirai +1
Angular-momentum transport provides a pathway for controlling energy flow in solids beyond conventional charge-based mechanisms. While spin currents are known to mediate spin-calor…
Trans-scale spin Seebeck effect in nanostructured bulk composites based on magnetic insulator
Sang J. Park, Keisuke Hirata, Hossein Sepehri-Amin +3
The spin Seebeck effect (SSE) enables thermoelectric conversion through thermally generated spin currents in magnetic materials, offering a promising transverse geometry for scalab…
Spin caloritronics: History and future prospects of experiments
Ken-ichi Uchida, Takamasa Hirai
Since the beginning of the 21st century, novel energy conversion and control principles utilizing the spin degree of freedom have been discovered in the field of spin caloritronics…
Structural heterogeneity-induced enhancement of transverse magneto-thermoelectric conversion revealed by thermoelectric imaging in functionally graded materials
Sang J. Park, Ravi Gautam, Takashi Yagi +3
Functionally graded materials (FGMs) exhibit continuous property variations that enable unique functionalities and provide efficient platforms for systematic property optimization.…
Non-equilibrium Magnon Engineering Enabling Significant Thermal Transport Modulation
Takamasa Hirai, Toshiaki Morita, Subrata Biswas +13
Thermal conductivity, a fundamental parameter characterizing thermal transport in solids, is typically determined by electron and phonon transport. Although other transport propert…
Fundamentals and advances in transverse thermoelectrics
Hiroto Adachi, Fuyuki Ando, Takamasa Hirai +3
Transverse thermoelectric effects interconvert charge and heat currents in orthogonal directions due to the breaking of either time-reversal symmetry or structural symmetry, enabli…