Daiki Hatanaka

Recent advances in on-chip magnomechanics for microwave phonon manipulation

Daiki Hatanaka, Motoki Asano, Hiroshi Yamaguchi

Abstract On-chip phononic devices have strong potential for microwave signal processing, but their use has been hindered by the limited schemes of active controls. Magnomechanics provides a promising solution by exploiting magnon-phonon interactions, enabling dynamic and tunable phonon manipulation. This review summarizes …

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Phase control of magnon-phonon coupling via magnetic field

Anonymous, Motoki Asano, Isamu Yasuda, Masashi Kawaguchi et autres

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Gigahertz Acoustic Wave Devices Using AlN Piezoelectric Thin Films

Hajime Okamoto, Megumi Kurosu, Daiki Hatanaka, Motoki Asano et autres

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Imaging valley-vortex edge modes in a phononic crystal at ultrahigh frequencies

Paul H. Otsuka, Motonobu Tomoda, Daiki Hatanaka, Hiroshi Yamaguchi et autres

We perform optical measurements and numerical simulations of guided phonon propagation in novel topological phononic crystal structures at ultrahigh frequencies. The structures support valley-polarized states that exhibit an energy vortex nature and propagate with high efficiency at domain boundaries because backscattering is …

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Magnon–Phonon Coupling of Synthetic Antiferromagnets in a Surface Acoustic Wave Cavity Resonator

Hiroki Matsumoto, Isamu Yasuda, Motoki Asano, Yasuhiro Todaka et autres

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

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Valley Pseudospin Polarized Evanescent Coupling between Microwave Ring Resonator and Waveguide in Phononic Topological Insulators

Daiki Hatanaka, Hiroaki Takeshita, Motoki Kataoka, Hajime Okamoto et autres

A coupled ring-waveguide structure is at the core of bosonic wave-based information processing systems, enabling advanced wave manipulations such as filtering, routing, and multiplexing. However, its miniaturization is challenging due to momentum conservation issues in rings with larger curvature that induce significant …

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Age-related variation in coagulation factors in non-valvular atrial fibrillation patients receiving direct oral anticoagulants

Osamu Kumano, Shinya Suzuki, Masako Yamazaki, Yoshimori An et autres

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

Hiroki Matsumoto, Isamu Yasuda, Motoki Asano, Takuya Kawada et autres

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 matrix of the SAW …

Quadrature skyrmions in two-dimensionally arrayed parametric resonators

Hiroshi Yamaguchi, Daiki Hatanaka, Motoki Asano

Skyrmions are topological solitons in two-dimensional systems and have been observed in various physical systems. Generating and controlling skyrmions in artificial resonator arrays lead to novel acoustic, photonic, and electric devices, but it is a challenge to implement a vector variable with …

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Evanescently coupled topological ring-waveguide systems for chip-scale ultrahigh frequency phononic circuits

Daiki Hatanaka, Hiroaki Takeshita, Motoki Kataoka, Hajime Okamoto et autres

Topological phononics enabling backscattering-immune transport is expected to improve the performance of electromechanical systems for classical and quantum information technologies. Nonetheless, most of the previous demonstrations utilized macroscale and low-frequency structures and thus offered little experimental insight into ultrahigh frequency phonon transport, …

Cavity magnomechanical coupling with coupled magnon modes in a synthetic antiferromagnet

Motoki Asano, Hiroki Matsumoto, Masamitsu Hayashi, Daiki Hatanaka

On-chip cavity magnomechanics is an emerging field exploring acoustic and magnonic functionalities of various ferromagnetic materials and structures using strongly confined phonons. It is expected that such cavity magnomechanics can be extended to multilayer ferromagnets, especially synthetic antiferromagnets (SAFs) that exhibit zero …

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Phononic Crystal Cavity Magnomechanics

Daiki Hatanaka, Motoki Asano, Hajime Okamoto, Hiroshi Yamaguchi

Phononic crystal (PnC) enables strong confinement of phonons in a wavelength-scale tiny area due to a band gap, which can enhance the interaction with different physical systems. Here, we utilize the PnC to demonstrate local manipulations of magnons by using ultrahigh frequency …

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