X-ray magnetic circular dichroism imaging with hard X-rays.
X-ray polarization-contrast images resulting from X-ray magnetic circular dichroism (XMCD) in the hard X-ray region have been successfully recorded for the first time. The apparatus used consisted of an X-ray polarizer, double X-ray phase retarders, and a high-spatial-resolution X-ray charge-coupled-device detector. The sample used was a hexagonal-close-packed cobalt polycrystal foil having a thickness of about 4 microns. The X-ray polarization-contrast image resulting from XMCD was observed at a photon energy of 10 eV above the cobalt K-absorption edge (7709 eV). The observed contrast in the image was reversed by inversion of the magnetic field. Furthermore, the contrast was reversed again at a photon energy of 32 eV above the cobalt K-absorption edge.
Sato
K
K
Department of Applied Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. sato@kohsai.t.u-tokyo.ac.jp
Ueji
Y
Y
Okitsu
K
K
Matsushita
T
T
Amemiya
Y
Y
D002942:Circular Dichroism; D008280:Magnetics; D012815:Signal Processing, Computer-Assisted; D014965:X-Rays