J. Chaboy et al., X-RAY CIRCULAR MAGNETIC DICHROISM (XCMD) AS A PROBE OF THE DYNAMICS OF THE SPIN REORIENTATION TRANSITIONS IN ND2FE14B AND ER2FE14B SYSTEMS, Europhysics letters, 28(2), 1994, pp. 135-141
We present the first experimental observation of a spin reorientation
phase transition (SRT) with the X-ray circular-magnetic-dichroism (XCM
D) technique. The XCMD signal, related to the projection of the rare-e
arth moment on the direction of the X-ray beam, has been measured as a
function of temperature for both, a first-order SRT in Er2Fe14B (abru
pt reorientation by 90-degrees) and a second-order one in Nd2Fe14B (co
ntinuous tilt of the magnetization from the c-axis). The feasibility o
f this technique to study SRTs and the capability to better understand
the magnetic behaviour of intermetallic compounds exhibiting coexiste
nce of itinerant and localized magnetism are demonstrated.