Magnonic Casimir effect in ferrimagnets

Nakata, Koki; Suzuki, Kei

Physical Review Letters, 130(9), p.096702_1 - 096702_6, 2023/03

https://doi.org/10.1103/PhysRevLett.130.096702

Quantum fluctuations of quantum fields induce a zero-point energy shift under spatial boundary conditions. This quantum phenomenon, called the Casimir effect, has been attracting much attention beyond the hierarchy of energy scales, whereas its application to spintronics has not yet been investigated enough, particularly to ferrimagnetic thin films. Here we fill this gap. Using the lattice field theory, we investigate the Casimir effect induced by quantum fields for magnons and find that the magnonic Casimir effect can arise not only in antiferromagnets but also in ferrimagnets (e.g., YIG). Thus, we pave the way for magnonic Casimir engineering.

Accelerator technical design report for High-intensity Proton Accelerator Facility Projest, J-PARC

High-intensity Proton Accelerator Project Team

JAERI-Tech 2003-044, 788 Pages, 2003/03

JAERI-Tech-2003-044.pdf:47.31MB

This report presents the detail of the technical design of the acclerators for the High-Intensity Proton Accelerator Facility Project, J-PARC. The accelerator complex comprises a 400-MeV room-temperature linac (600-MeV superconducting linac), 3-GeV rapid-cycling synchrotron (RCS), and a 50-GeV synchrotron (MR). The 400-MeV beam is injected to the RCS, being accelerated to 3 GEV. The 1-MW beam thus produced is guided to the Materials Life Science Experimental Facility, with both the pulsed spallation neutron source and muon source. A part of the beam is transported to the MR, which provides the 0.75-MW beam to eithter the Nuclear and Fundamental Particle Experimental Facility or the Neutrino Production Target. On the other hand, the beam acclerated to 600 MeV by the superconducting linac is used for the Nuclear Waster Transmutation Experiment. In this way, this facility is unique, being multipurpose one, including many new inventions and Research and Development Results.

The Joint project for high-intensity proton accelerators

JAERI-Tech 99-056, 78 Pages, 1999/08

JAERI-Tech-99-056.pdf:6.22MB

no abstracts in English

Evaluation of the defect level in 4H-SiC schottky barrier diode by alpha particle induced charge transient spectroscopy

Kambayashi, Yuya; Onoda, Shinobu; Kada, Wataru*; Makino, Takahiro; Hoshino, Norihiro*; Tsuchida, Hidekazu*; Oshima, Takeshi; Kamiya, Tomihiro; Hanaizumi, Osamu*

no journal, , 

no abstracts in English