4 citations · 5 across the 12 of their papers we have counts for
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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…
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…
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…