Explanipedia

Model calculations of lattice strains and rotations associated with surface acoustic waves Open

Takuya Kawada, Masashi Kawaguchi, Hiroki Matsumoto, Masamitsu Hayashi · 2025

Magnon–phonon coupling has garnered increasing interest in condensed matter physics due to its rich physics and potentials for applications in devices with novel functionalities. Surface acoustic waves (SAWs) are widely used to generate co…

Significant electron-magnon scattering in layered ferromagnet Cr2Te3 Open

Yujun Wang, Shunzhen Wang, Masashi Kawaguchi, Jun Uzuhashi, Akhilesh Kumar Patel , et al. · 2025

A layered ferromagnet Cr2Te3 is attracting growing interest because of its unique electronic and magnetic properties. Studies have shown that it exhibits a sizable anomalous Hall effect (AHE) that changes sign with temperature. The origin …

Spin current generation by acousto-electric evanescent wave Open

Takuya Kawada, Masashi Kawaguchi, Kei Yamamoto, Hiroki Matsumoto, Ryusuke Hisatomi , et al. · 2024

We experimentally demonstrate that a spin current can be induced by the acousto-electric evanescent wave, an electric field associated with surface acoustic waves (SAWs) that decay along the surface normal. A previous study showed that a m…

Electromagnetic evanescent field associated with surface acoustic wave: Response of metallic thin films Open

Takuya Kawada, Kei Yamamoto, Masashi Kawaguchi, Hiroki Matsumoto, Ryusuke Hisatomi , et al. · 2024

Surface acoustic waves (SAWs), coherent vibrational modes localized at solid surfaces, have been employed to manipulate and detect electronic and magnetic states in condensed-matter systems via strain. SAWs are commonly excited in a piezoe…

Relationship between orbital moment anisotropy, magnetocrystalline anisotropy, and Dzyaloshinskii-Moriya interaction in W/Co/Pt trilayers Open

Zhendong Chi, Yong‐Chang Lau, Vanessa Li Zhang, Goro Shibata, Shoya Sakamoto , et al. · 2024

We have studied the Co layer thickness dependences of magnetocrystalline anisotropy (MCA), Dzyaloshinskii-Moriya interaction (DMI), and orbital moment anisotropy (OMA) in W/Co/Pt trilayers, in order to clarify their correlations with each …

Decoding the magnetic bit positioning error in a ferrimagnetic racetrack Open

Mio Ishibashi, Masashi Kawaguchi, Yuki Hibino, Kay Yakushiji, A. Tsukamoto , et al. · 2024

Current-driven motion of magnetic domain walls is one of the key technologies for developing storage class memory devices. Extensive studies have revealed a variety of material systems that exhibit high-speed and/or lower power propagation…

Visualization of the Plasmid DNA Delivery System by Complementary Fluorescence Labeling of Arginine-Rich Peptides Open

Ayumi Imayoshi, Hidetomo Yokoo, Masashi Kawaguchi, Kazunori Tsubaki, Makoto Oba · 2024

Cell-penetrating peptides, such as arginine-rich peptides, encapsulate nucleic acid drugs and deliver them to intracellular compartments. Comprehensive tracking of drug delivery systems (DDSs) provides information about the behavior of the…

Acoustoelectric non-local spin wave power detector for studying magnon-phonon coupling Open

Hiroki Matsumoto, Yasuhiro Todaka, Takuya Kawada, Masashi Kawaguchi, Masamitsu Hayashi · 2024

We have developed a simple detection scheme to study spin waves excited by surface acoustic wave (SAW) in ferromagnetic thin films. Metallic antennas made of Ta and a ferromagnetic element are placed along the SAW propagation path. The SAW…

Fostering Entrepreneurial Spirit in Higher Education: A Case Study of Startup Education in Japan Open

Tatsuya Shirai, Katsuko T. Nakahira, Hideyuki Kanematsu, Dana M. Barry, Nobuyuki Ogawa , et al. · 2024

Learning Neural Network Circuit based on Logarithmic Multipliers Open

Masashi Kawaguchi, Naohiro Ishii, Masayoshi Umeno · 2024

Analyzing Viewer Impressions of 3D Undersea Expeditions Through Mixed Methods: Psychological Responses and Textual Analysis Using a Head-Mounted Display Open

Hideyuki Kanematsu, Dana M. Barry, Nobuyuki Ogawa, Katsuko T. Nakahira, Kuniaki Yajima , et al. · 2024

Magnon-phonon coupling of synthetic antiferromagnets in a surface acoustic wave cavity resonator Open

Hiroki Matsumoto, Isamu Yasuda, Motoki Asano, Takuya Kawada, Masashi Kawaguchi , et al. · 2023

We use a surface acoustic wave (SAW) cavity resonator to study the coupling of acoustic magnons in a synthetic antiferromagnet (SAF) and the phonons carried by SAWs. The SAF is composed of a CoFeB/Ru/CoFeB trilayer and the scattering matri…

On-chip all-electrical determination of the magnetoelastic coupling constant of magnetic heterostructures Open

Takuya Kawada, Isamu Yasuda, Masashi Kawaguchi, Masamitsu Hayashi · 2023

We have developed an approach to determine the magnetoelastic coupling constant of magnetic layers in thin film heterostructures. The film is formed on a piezoelectric substrate between two interdigital transducers (IDTs), a platform often…

Spin and orbital Hall currents detected via current induced magneto-optical Kerr effect in V and Pt Open

Yukihiro Marui, Masashi Kawaguchi, Satoshi Sumi, Hiroyuki Awano, K. Nakamura , et al. · 2023

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…

Helicity-resolved Raman spectroscopy of mono- and a few-layers-thick PtSe2 Open

Isamu Yasuda, Takuya Kawada, Hiroki Matsumoto, Masashi Kawaguchi, Masamitsu Hayashi · 2023

We studied helicity-resolved Raman scattering in PtSe 2 flakes with different thicknesses. The peak amplitude of helicity-switched Raman scattering is significantly larger than that of helicity-conserved scattering for the in-plane E g mod…

Anomalous Hall effect of light-driven three-dimensional Dirac electrons in bismuth Open

Yoshua Hirai, N. Yoshikawa, Masashi Kawaguchi, Masamitsu Hayashi, Shun Okumura , et al. · 2023

Recent advancement in laser technology has opened the path toward the manipulation of functionalities in quantum materials by intense coherent light. Here, we study three-dimensional (3D) Dirac electrons driven by circularly polarized ligh…

Analog Neural Network Model based on Logarithmic Four-Quadrant Multipliers Open

Masashi Kawaguchi, Chihiro Ikuta, Naohiro Ishii, Masayoshi Umeno · 2023

Models for artificial intelligence, machine learning, and neural networks are implemented ondigital computers with a von Neumann architecture. Few studies have considered analog neuralnetworks. In our previous study, we used multipliers fo…

Evaluation Methods and Differences between Three Dimensional And Two Dimensional Movies by Physiological Measurements Using A Commercial 6-Axis Sensor Open

Hideyuki Kanematsu, Dana M. Barry, Nobuyuki Ogawa, Kuniaki Yajima, Katsuko T. Nakahira , et al. · 2023

The term "metaverse" has become a common word in recent years. This term, a virtual space on the Internet, is gaining importance in various fields in today's era of remarkable progress toward the fusion of virtual space and real space usin…

Spin Hall effect driven by the spin magnetic moment current in Dirac materials Open

Zhendong Chi, Guanxiong Qu, Yong‐Chang Lau, Masashi Kawaguchi, Junji Fujimoto , et al. · 2022

The spin Hall effect of a Dirac Hamiltonian system is studied using semiclassical analyses and the Kubo formula. In this system, the spin Hall conductivity is dependent on the definition of spin current. All components of the spin Hall con…

Large surface acoustic wave nonreciprocity in synthetic antiferromagnets Open

Hiroki Matsumoto, Takuya Kawada, Mio Ishibashi, Masashi Kawaguchi, Masamitsu Hayashi · 2022

We have studied the transmission of surface acoustic waves (SAWs) in ferromagnetic/non-magnetic/ferromagnetic tryilayers. The SAW scattering matrix is studied for devices with various non-magnetic spacer thickness, which defines the streng…

Three Dimensional Experiences Using a Commercially-Integrated Stand-alone Head-Mounted Display and Applying it to Education Open

Hideyuki Kanematsu, Dana M. Barry, Tatsuya Shirai, Nobuyuki Ogawa, Kuniaki Yajima , et al. · 2022

In this study, we introduce a plan about the application of various realities for future educational purposes. To start, we provide an overview for three types of realities [Virtual Reality (VR), Augmented Reality (AR) and Mixed Reality (M…

Virtual Experiences of Metaverse Using Mobile Type Head-Mounted Displays and Their Applicability Open

Hideyuki Kanematsu, Dana M. Barry, Tatsuya Shirai, Nobuyuki Ogawa, Kuniaki Yajima , et al. · 2022

The concept of a 3D experience using the Google Cardboard VR headset and cell phones is discussed in terms of its educational effect. As for the video component, content on YouTube as a 360°VR video is used. The following three topics are …

Charge–spin conversion in Pt1−xBix alloys for spin–orbit torque switching Open

Zhendong Chi, Yong‐Chang Lau, Masashi Kawaguchi, Masamitsu Hayashi · 2021

We have studied the spin torque efficiency of Pt1−xBix/Co based heterostructures for spin–orbit torque (SOT) switching devices. While the field-like component of the SOT shows a relatively small change with the Bi concentration (x), the da…

Interface-enhanced helicity dependent photocurrent in metal/semimetal bilayers Open

Hana Hirose, Masashi Kawaguchi, Yong‐Chang Lau, Zhendong Chi, Frank Freimuth , et al. · 2021

One of the hallmarks of light-spin interaction in solids is the appearance of\nphotocurrent that depends on the light helicity. Recent studies have shown that\nhelicity dependent photocurrent (HDP) emerges due to light induced spin current…

Switchable generation of azimuthally- and radially-polarized terahertz beams from a spintronic terahertz emitter Open

Hiroaki Niwa, N. Yoshikawa, Masashi Kawaguchi, Masamitsu Hayashi, Ryo Shimano · 2021

We propose and demonstrate a method of generating two fundamental terahertz cylindrical vector beams (THz-CVBs), namely the azimuthally- and radially-polarized THz pulses, from a spintronic THz emitter. We begin by presenting that the spin…

On the relationship between orbital moment anisotropy, magnetocrystalline anisotropy, and Dzyaloshinskii-Moriya interaction in W/Co/Pt trilayers Open

Zhendong Chi, Yong‐Chang Lau, Vanessa Li Zhang, Goro Shibata, Shoya Sakamoto , et al. · 2021

We have studied the Co layer thickness dependences of magnetocrystalline anisotropy (MCA), Dzyaloshinskii-Moriya interaction (DMI), and orbital moment anisotropy (OMA) in W/Co/Pt trilayers, in order to clarify their correlations with each …

Acoustic spin Hall effect in strong spin-orbit metals Open

Takuya Kawada, Masashi Kawaguchi, Takumi Funato, Hiroshi Kohno, Masamitsu Hayashi · 2021

We have found the acoustic spin Hall effect that facilitates lattice motion-induced spin current in strong spin-orbit metals.

Research Activities in Materials Science and Engineering with Academic-Industrial Alliances during the COVID-19 Pandemic Open

Hideyuki Kanematsu, Dana M. Barry, Nobuyuki Ogawa, Shin‐nosuke Suzuki, Kuniaki Yajima , et al. · 2021

Giant inverse Faraday effect in Dirac semimetals Open

Masashi Kawaguchi, Hana Hirose, Zhendong Chi, Yong‐Chang Lau, Frank Freimuth , et al. · 2020

We have studied helicity dependent photocurrent (HDP) in Bi-based Dirac semimetal thin films. HDP increases with film thickness before it saturates, changes its sign when the majority carrier type is changed from electrons to holes and tak…

The Experiment of COMMONS Game and the Environmental Education Open

Masashi Kawaguchi, Norio Baba · 2020

Gaming has been recognized as a new method of solving problems. It is widely known as a method of solving problems which is to solve by simulation. We conducted the COMMONS game and reported its environmental educational effect. The COMMON…

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