4 citations · 5 across the 12 of their papers we have counts for
12 papers
XUV Transmission Spectroscopy Using a Tabletop High-Harmonic Source
Ryunosuke Takahashi, Soudai Sakoda, Kaede Yamada +5
High-harmonic generation (HHG) provides a coherent ultrashort-pulse light source in the extreme- ultraviolet (XUV) region and has potential applications in time-resolved spectrosco…
Bayesian model comparison of type-I and type-II ultrafast demagnetization dynamics
Hiroki Wadati, Tetsuro Ueno
Ultrafast demagnetization dynamics are often phenomenologically classified into type-I and type-II responses according to their temporal evolution following femtosecond laser excit…
Type-II-like ultrafast demagnetization behavior in NiCo2O4 thin films
Ryunosuke Takahashi, Kaede Yamada, Harjinder Singh +10
Rare-earth-ferrimagnetic oxides are emerging as attractive platforms for investigating ultrafast spin dynamics. Here, we study the photoinduced magnetization dynamics of epitaxial…
Recent Progress in Ultrafast Dynamics of Transition-Metal Compounds Studied by Time-Resolved X-ray Techniques
Hiroki Wadati, Kohei Yamamoto, Kohei Yamagami
X-ray absorption spectroscopy and X-ray magnetic circular dichroism have long served as indispensable tools for probing the electronic and magnetic properties of transition-metal c…
Raman Spectroscopic Investigation of Ferroaxial Order in Na2BaNi(PO4)2 Single Crystals
Ryunosuke Takahashi, Hayato Seno, Marin Takahashi +9
Ferroaxial order is characterized by the breaking of mirror symmetry parallel to the crystallographic principal axis, which often originates from spontaneous rotational distortions…
Development of a Ferromagnetic Resonance Measurement System Using NanoVNA
Reo Fukunaga, Ryunosuke Takahashi, Tetsuro Ueno +3
Ferromagnetic resonance (FMR) is a fundamental technique for probing magnetization dynamics in spintronic and magnetic materials. However, conventional FMR measurements rely on bro…
Teaching light absorption and the Beer-Lambert law using everyday materials: a tomato juice experiment for introductory physics
Hiroki Wadati
I describe a visually engaging experiment to demonstrate the Beer-Lambert law in introductory physics or general science courses. By using diluted tomato juice as a naturally color…
Synthesis, crystal and electronic structures, and second harmonic generation of La 4Ge 3S12
Hiroya Ohtsuki, Suguru Nakata, Yu Yamane +3
The crystal structure of La 4 Ge 3S 12 has been known to be noncentrosymmetric for almost four decades. This characteristic inversion symmetry breaking suggests the presence of non…
Photo-induced phase transition on black samarium monosulfide
Hiroshi Watanabe, Yusuke Takeno, Yusuke Negoro +14
To investigate the role of the excitons for the origin of the pressure-induced phase transition (BGT) from the black-colored insulator (BI) to the golden-yellow-colored metal (GM)…
All-optical helicity-dependent switching in NiCoO thin films
Ryunosuke Takahashi, Yann Le Guen, Suguru Nakata +8
All-optical switching (AOS) involves manipulating magnetization using only pulsed laser, presenting a promising approach for next-generation magnetic recording devices. NiCo2O4 (NC…
Spectroscopic investigations on trivalent ruthenium ions in ruthenium perovskite oxide thin films
S. Nakata, R. Takahashi, R. Matsumoto +6
The electron configurations under the crystal field, spin-orbit coupling, and Coulomb interaction give rise to a plethora of profound ground states. Ruthenium perovskite oxid…
Light-enhanced gating effect at the interface of oxide heterostructure
Neha Wadehra, Ruchi Tomar, Yuichi Yokoyama +5
In semiconducting materials, electrostatic gating and light illumination are widely used stimuli to tune the electronic properties of the system. Here, we show a significant enhanc…