9 papers
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…
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…
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…