X-RAY MAGNETIC COMPTON-PROFILE MEASUREMENTS ON SMCO5 BY USING PULSED HIGH MAGNETIC-FIELD

A pulse magnet is applied to an experiment on magnetic Compton scatter ing using circularly polarized synchrotron-radiation X-rays. The sampl e is c-asis oriented SmCo5, which is known to be a hard magnetic mater ials. Consecutive pulsed magnetic fields of 11.7 tesla are used to rep eatedly reverse the magnetization direction of the sample. The measure ment is done with residual magnetization of the sample at room tempera ture. The magnetic Compton profile is found to be well-reproduced by a combination of a theoretical Sm-4f profile and an experimental Co pro file. On the assumption that the Co spin moment in the hexagonal symme try is 1.56 mu(B), the Sm-4f spin moment is evaluated to be -1.79 mu(B ), which is quite small compared with the expected spin moment 3.57 mu (B) for the Sm ground state (J = 5/2 M(J) = 5/2). This experiment sugg ests for the first time the feasibility of using pulse magnets for X-r ay magnetic scattering and absorption measurements on hard magnetic ma terials.