Satoshi Sumi
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View article: A Computational Approach to AI-Based Interview Simulations: Integrating Job Specific Question Generation, Speech Confidence Analysis, and Non-Verbal Cues
A Computational Approach to AI-Based Interview Simulations: Integrating Job Specific Question Generation, Speech Confidence Analysis, and Non-Verbal Cues Open
Traditional interview preparation techniques frequently fall short in giving individualized, real-time feedback due to the increased competitiveness in the job market. To improve candidates' readiness through real-time skill evaluation, th…
View article: Current-induced domain wall motion driven by spin–orbit torque and Dzyaloshinskii–Moriya interaction in Pt/GdFeCo and Rh/GdFeCo wires
Current-induced domain wall motion driven by spin–orbit torque and Dzyaloshinskii–Moriya interaction in Pt/GdFeCo and Rh/GdFeCo wires Open
We investigated current-induced domain wall motion (CIDWM) driven by spin–orbit torque and Dzyaloshinskii–Moriya interaction (DMI) in ferrimagnetic Pt/GdFeCo/SiN and Rh/GdFeCo/SiN wires with perpendicular magnetic anisotropy at room temper…
View article: Bipolar transverse thermopower and low thermal conductivity for an anomalous Nernst-type heat flux sensor in GdCo alloys
Bipolar transverse thermopower and low thermal conductivity for an anomalous Nernst-type heat flux sensor in GdCo alloys Open
A Heat Flux Sensor (HFS) facilitates the visualization of heat flow, unlike a temperature sensor, and is anticipated to be a key technology in managing waste heat. Recently, an HFS utilizing the Anomalous Nernst Effect (ANE) has been propo…
View article: Comparison of Current Induced Domain Wall Motion Driven by Spin Transfer Torque and by Spin Orbit Torque in Ferrimagnetic GdFeCo Wires
Comparison of Current Induced Domain Wall Motion Driven by Spin Transfer Torque and by Spin Orbit Torque in Ferrimagnetic GdFeCo Wires Open
Current-induced domain wall motion (CIDWM) in magnetic wires can be driven by spin transfer torque (STT) originating from transferring angular momentums of spin-polarized conducting electrons to the magnetic DW and can be driven by spin or…
View article: Drastic enhancement of stable and fast domain wall motion in GdFe nanowires through laser-annealing treatment at wire edges
Drastic enhancement of stable and fast domain wall motion in GdFe nanowires through laser-annealing treatment at wire edges Open
One of the key challenges in racetrack memory (RM) technology is achieving stable and high velocities for domain walls (DWs) while maintaining low power consumption. In our study, we propose a novel laser-annealing (LA) process to modify w…
View article: Maximizing bipolar sensitivity for anomalous Nernst thermopiles in heat flux sensing in amorphous GdCo alloys
Maximizing bipolar sensitivity for anomalous Nernst thermopiles in heat flux sensing in amorphous GdCo alloys Open
A Heat Flux Sensor (HFS) facilitates the visualization of heat flow, unlike a temperature sensor, and is anticipated to be a key technology in managing waste heat. Recently, an HFS utilizing the Anomalous Nernst Effect (ANE) has been propo…
View article: Coexistence of large anomalous Nernst effect and large coercive force in amorphous ferrimagnetic TbCo alloy films
Coexistence of large anomalous Nernst effect and large coercive force in amorphous ferrimagnetic TbCo alloy films Open
The Anomalous Nernst Effect (ANE) has garnered significant interest for practical applications, particularly in energy harvesting and heat flux sensing. For these applications, it is crucial for the module to operate without an external ma…
View article: Estimation of TbCo composition from local-minimum-energy magnetic images taken by magneto-optical Kerr effect microscope by using machine learning
Estimation of TbCo composition from local-minimum-energy magnetic images taken by magneto-optical Kerr effect microscope by using machine learning Open
Recently, the incorporation of machine learning (ML) has heralded significant advancements in materials science. For instance, in spintronics, it has been shown that magnetic parameters, such as the Dzyaloshinskii–Moriya interaction, can b…
View article: Spin and orbital Hall currents detected via current induced magneto-optical Kerr effect in V and Pt
Spin and orbital Hall currents detected via current induced magneto-optical Kerr effect in V and Pt Open
We have studied the film thickness dependence of the current-induced magneto-optical Kerr effect in Pt and V thin films. The Kerr signal for Pt shows little dependence on the thickness in the range studied (20-80 nm). In contrast, the sign…
View article: Evaluation of multi-bit domain wall motion by low current density to obtain ultrafast data rate in a compensated ferrimagnetic wire
Evaluation of multi-bit domain wall motion by low current density to obtain ultrafast data rate in a compensated ferrimagnetic wire Open
Architectures based on multi-bit magnetic domain walls (DWs) take advantage of the fast speed, high density, nonvolatility, and flexible design of DWs to process and store data bits. However, controlling multi-bit DWs driven by electric cu…
View article: Enhancement of permittivity off-diagonal terms in rare earth transition metal / heavy metal hetero-structured films
Enhancement of permittivity off-diagonal terms in rare earth transition metal / heavy metal hetero-structured films Open
The spin Hall effect, Dzyaloshinskii-Moriya interaction, Rashba effect, etc. are extremely important effects for the development of the conduction phenomenon of spin electronics due to the breaking of the spatial inversion symmetry of the …
View article: Laser induced spin injection to [GeTe/Sb2Te3] superlattice through a TbFeCo film
Laser induced spin injection to [GeTe/Sb2Te3] superlattice through a TbFeCo film Open
A [GeTe/Sb2Te3] superlattice is known as a topological insulator and it shows magnetic responses such as magneto-optical effect although it does not contain any magnetic element. We reported the superlattice has topologically protected spi…
View article: Ferromagnetic Resonance of a [GeTe/Sb<sub>2</sub>Te<sub>3</sub>]<sub>6</sub>/Py Superlattice
Ferromagnetic Resonance of a [GeTe/Sb<sub>2</sub>Te<sub>3</sub>]<sub>6</sub>/Py Superlattice Open
A [GeTe/Sb2Te3] superlattice is known as a topological insulator. It shows magnetic responses such as magneto-optical effect, magneto resistance, magneto capacitance, and so on. We have reported that [GeTe/Sb2
View article: Ultra-thin interfacial domain wall less than 1 nm based on TbxCo100−x/Cu/[Co/Pt]2 heterostructures for multi-level magnetic pillar memory
Ultra-thin interfacial domain wall less than 1 nm based on TbxCo100−x/Cu/[Co/Pt]2 heterostructures for multi-level magnetic pillar memory Open
We propose a new pillar type of multi-level memory with TbxCo100−x/Cu/[Co/Pt]2 heterostructures to achieve high storage density and controllable domain wall position in-memory applications. The structure consists of amorphous ferrimagnetic…
View article: Topologically protected spin diffusion and spin generator using chalcogenide superlattices
Topologically protected spin diffusion and spin generator using chalcogenide superlattices Open
Spintronics is expected to be the basis for future ultra-low-energy nanoelectronic devices. To operate such devices at room temperature, amplifiers, batteries, capacitors, as well as spin current sources are required. Here we report a chal…
View article: Interference Induced Enhancement of Magneto-Optical Effect in Pt/TbCo Hetero-Structured Films
Interference Induced Enhancement of Magneto-Optical Effect in Pt/TbCo Hetero-Structured Films Open
Magnetic films with a heavy metal layer show strong interfacial interaction of spin-orbit. Spin-orbit interaction is one of the key technologies for spintronics. In this paper, we measured magneto-optical Kerr spectra of Pt/TbCo hetero-str…
View article: Interference induced enhancement of magneto-optical Kerr effect in ultrathin magnetic films
Interference induced enhancement of magneto-optical Kerr effect in ultrathin magnetic films Open
View article: Thermal reduction of the threshold current density for current-induced domain wall motion in Tb-Co magnetic alloy wire
Thermal reduction of the threshold current density for current-induced domain wall motion in Tb-Co magnetic alloy wire Open
We investigated the current-induced domain wall motion (CIDWM) in Pt (3 nm)/Tb0.34Co0.66 (6 nm) alloy wire at various temperatures (T). The threshold current density (Jth) for the CIDWM in the Tb-Co alloy wire was 0.85 × 1011 A/m2 at room …