12 citations · 20 across the 4 of their papers we have counts for
5 papers
Magnetic Permeability Time-varying Metamaterials at Microwave Frequencies
Toshiyuki Kodama, Nobuaki Kikuchi, Takahiro Chiba +3
We demonstrate magnetic permeability time-varying metamaterials at GHz frequencies using ferromagnetic permalloy (Ni80Fe20; Py). We observe frequency up and down conversion of 4 GH…
Microwave One-way Transparency by Large Synthetic Motion of Magnetochiral Polaritons in Metamolecules
Kentaro Mita, Toshiyuki Kodama, Toshihiro Nakanishi +4
We observe microwave nonreciprocal one-way transparency via ultrastrongly-coupled magnetochiral polaritons (MChPs) in a metamolecule at room temperature. The experimental results u…
Ultrastrongly-coupled and Directionally-nonreciprocal Magnon-polaritons in Magnetochiral Metamolecules
Kentaro Mita, Takahiro Chiba, Toshiyuki Kodama +4
We experimentally demonstrate magnon-polaritons with ultrastrong coupling and directional nonreciprocity in a metamolecule lacking time-reversal and space-inversion symmetries at r…
Pure moving optical media consisting of magnetochiral metasurfaces
Toshiyuki Kodama, Toshihiro Nakanishi, Kei Sawada +1
We report numerical studies of microwave bianisotropies by magnetochiral (MCh) metasurfaces consisting of double Z-type gammadions with perpendicularly magnetized substrates. The m…
Direct observation of current-induced nonlinear spin torque in Pt-Py bilayers
Toshiyuki Kodama, Nobuaki Kikuchi, Takahiro Chiba +3
We experimentally observe nonlinear spin torque in metallic bilayers of platinum and permalloy by means of spin-torque ferromagnetic-resonance (ST-FMR) under massive dc current inj…