2008/08/21 by Keisuke Yamada, K. Yamada, Shinya Kasai +5
Chemistry · Engineering · Physics and Astronomy · #Characterization and Applications of Magnetic Nanoparticles #Chemistry #Condensed matter physics #Core (optical fiber) #Current (fluid) #Electromagnetic coil #Ferromagnetism #Magnetic core #Magnetic field #Magnetic properties of thin films #Magnetic storage #Magnetization #Materials science #Mechanics #Micromagnetics #Nanosecond #Optics #Physics #Polarity (international relations) #Pulse (music) #Quantum and electron transport phenomena #Vortex #cond-mat.mtrl-sci #cond-mat.other
paper · pdf · doi:10.1063/1.3001588
13 pages, 4 figures
arxiv created 2008/08/21 · openalex publication_date 2008/10/13 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In a ferromagnetic nanodisk, the magnetization tends to swirl around in the plane of the disk and can point either up or down at the center of this “magnetic vortex.” This binary state can be useful for information storage. It is demonstrated that a single nanosecond current pulse can switch the core polarity. This method also provides the precise control of the core direction, which constitutes fundamental technology for realizing a vortex core memory.