The world first Soft X-ray spectroscopy under very high magnetic fields - Accelerating the development of high performance magnets without rare-earth -


  Tohoku University, Japan Synchrotron Radiation Research Institute (JASRI), and Institute for Solid State Physics, University of Tokyo, have succeeded in the world first soft X-ray spectroscopy under very high magnetic fields of 21 Tesla (= 210,000 gauss) at the beam line BL25SU of SPring-8. The developed system realizes magnetic analysis by Soft X-ray Magnetic Circular Dichroism (MCD) on any of magnetic materials for practical use, including strong rare earth magnets. It would be useful to examine the role of rare-earth elements such as Dysprosium in the magnet and to find out some ubiquitous elements for replacement of expensive ones. The collaboration research has been represented by Associate Professor Yasuo Narumi at Tohoku University, Senior Researcher Tetsuya Nakamura at JASRI, and Koichi Kindo at University of Tokyo. The results have been published online in Applied Physics Express (APEX) on May 24, 2011. The paper's title is "Soft X-ray Magnetic Circular Dichroism of a CoFe/MnIr Exchange Bias Film under Pulsed High Magnetic Field".