2008/07/11 by Shinya Kasai, S. Kasai, Peter Fischer +6 · 1 citation
Biochemistry, Genetics and Molecular Biology · Chemistry · Physics and Astronomy · #Advanced Electron Microscopy Techniques and Applications #Chemistry #Condensed matter physics #Current (fluid) #Magnetic field #Magnetic properties of thin films #Magnetization #Magnetization dynamics #Optics #Permalloy #Physics #Polarization (electrochemistry) #Vortex #X-ray Spectroscopy and Fluorescence Analysis #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevlett.101.237203
published in Physical Review Letters 101(23), 237203 (American Physical Society) · 13 pages, 3 figures
arxiv created 2008/07/11 · openalex publication_date 2008/12/04 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Time-resolved soft x-ray transmission microscopy is applied to image the current-induced resonant dynamics of the magnetic vortex core realized in a micron sized Permalloy disk. The high spatial resolution better than 25 nm enables us to observe the resonant motion of the vortex core. The result also provides the spin polarization of the current to be 0.67+/-0.16 for Permalloy by fitting the experimental results with an analytical model in the framework of the spin-transfer torque.