Publications by authors named "K Kondou"
Article Synopsis
- Surface acoustic waves (SAW) can transmit phononic angular momentum, offering a potential method for energy-efficient magnetism control.
- The study investigates SAW-induced magnetoacoustic waves and spin pumping in nickel-based films on lithium niobate, revealing how crystal inversion asymmetry creates circularly polarized phonons with significant out-of-plane angular momentum.
- Results indicate that up to 60% of SAW power is nonreciprocally affected by the out-of-plane magnetization, highlighting the connection between phononic angular momentum and crystal structure, while suggesting new methods for manipulating spin currents with circularly polarized phonons.
Article Synopsis
- Antiferromagnets (AFMs) are promising for domain-wall applications due to their terahertz spin dynamics and minimal stray fields, but controlling them is tough because of their weak magneto-electric responses.
- Recent studies on noncollinear chiral AFMs like MnX (X = Sn, Ge) show that it's possible to detect and manipulate their magnetic octupole domain states effectively.
- The research demonstrated that the magnetic octupole domain-wall (MODW) in MnGe can be driven at speeds up to 750 m/s with relatively low current density, suggesting a new approach for developing antiferromagnetic domain-wall technologies.
Here, we report the observation of strong coupling between magnons and surface acoustic wave (SAW) phonons in a thin CoFeB film constructed in an on-chip SAW resonator by analyzing SAW phonon dispersion anticrossings. We employ a nanostructured SAW resonator design that, in contrast to conventional SAW resonators, allows us to enhance shear-horizontal strain. Crucially, this type of strain couples strongly to magnons.
View Article and Find Full Text PDF[Lymphocytic colitis caused by medicine ingredient modification].
Nihon Shokakibyo Gakkai Zasshi
November 2022
Article Synopsis
- A 49-year-old woman was admitted to the hospital due to persistent diarrhea, leading to further investigation.
- Colonoscopy showed abnormal vascular patterns and edema in one part of the colon, along with unusual mucosal changes in the sigmoid colon and rectum.
- She was diagnosed with lymphocytic colitis, which was linked to a change in her medication 4 years prior; her diarrhea symptoms improved after stopping the medication.
Electrical control of a magnetic state of matter lays the foundation for information technologies and for understanding of spintronic phenomena. Spin-orbit torque provides an efficient mechanism for the electrical manipulation of magnetic orders. In particular, spin-orbit torque switching of perpendicular magnetization in nanoscale ferromagnetic bits has enabled the development of stable, reliable and low-power memories and computation.
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