Pohang University of Science and Technology · Materials Science
Professor Hyungyu Jin's research lab specializes in advanced materials and spintronic phenomena, focusing on the development of high-entropy alloys, thermoelectric and spintronic devices, and novel functional oxides for clean energy applications. The lab integrates machine learning with experimental materials science to accelerate the discovery and optimization of new materials, particularly in the context of phase prediction and interface engineering. Key research directions include the spin Seebeck effect, hydrogen production via thermochemical cycles, and defect engineering in polycrystalline magnetic materials. The lab aims to bridge fundamental materials physics with practical energy conversion technologies.
Figures are computed from collected data and may differ slightly.
Identifying phase information of high-entropy alloys (HEAs) can be helpful as it provides useful information such as anticipated mechanical properties. Recently, machine learning methods are attracting interest to predict phases of HEAs, which could reduce the effort for designing new HEAs. As research direction is in its infancy, there is still plenty of room to develop machine learning models to improve the prediction accuracy and further guide the design of HEAs. In this work, we employ deep
We report the discovery of a new class of oxides – poly-cation oxides (PCOs) – that consist of multiple cations and can thermochemically split water in a two-step cycle to produce hydrogen (H<sub>2</sub>) and oxygen (O<sub>2</sub>).
We study the temperature dependence of the longitudinal spin Seebeck effect (LSSE) in an yttrium iron garnet ${\mathrm{Y}}_{3}\mathrm{F}{\mathrm{e}}_{5}{\mathrm{O}}_{12}$ (YIG)/Pt system for samples of different thicknesses. In this system, the thermal spin torque is magnon driven. The LSSE signal peaks at a specific temperature that depends on the YIG sample thickness. We also observe freeze-out of the LSSE signal at high magnetic fields, which we attribute to the opening of an energy gap in th
A new mechanism is identified for doping semiconductors, based on modifications accomplished by impurity atoms deep in the valence band.
We describe two strategies to enhance the thermoelectric conversion efficiency of spin Seebeck devices and demonstrate a simultaneous realization of them <italic>via</italic> a simple heat treatment scheme.
The spin Seebeck effect (SSE) is an emergent thermoelectric phenomenon, which enables a thermal-to-electrical energy conversion via the thermal injection of spin currents from a ferromagnet (FM) into an attached paramagnetic metal (PM). Recent studies have revealed that the SSE is very sensitive to the PM/FM interface condition, suggesting a potential way to enhance the SSE by controlling the interface condition. However, most of the previous studies are limited to conventional Pt/bulk single-cr
Bismuth-antimony ($\mathrm{B}{\mathrm{i}}_{100\text{\ensuremath{-}}x}\mathrm{S}{\mathrm{b}}_{x}$) alloys have the highest thermoelectric figure of merit of all $n$-type thermoelectric materials below 200 K. They are the only Te-free thermoelectric alternatives to the tetradymite materials for applications at and below room temperature. Single-crystal $\mathrm{B}{\mathrm{i}}_{100\text{\ensuremath{-}}x}\mathrm{S}{\mathrm{b}}_{x}$ alloys show the maximum figure of merit $zT\ensuremath{\sim}0.5$ at
Stretchable electronic devices are known as elastic electronics or circuits. They are typically built by deposition or embedding of devices and circuits onto stretchable substrates, which can sustain large strains without failure. The research on this emerging technology has focused on the development of components based on insulators, conductors, or semiconductors to overcome inherent difficulties of generating mechanically stable layers and interconnections. In addition to the mechanical chall
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