TIME-RESOLVED SURFACE MAGNETOMETRY IN THE NANOSECOND SCALE USING SYNCHROTRON-RADIATION

The dynamics of magnetization reversal at surfaces and interfaces is s tudied by a specific photoelectric effect experiment with pulsed soft x rays. This novel time-resolved surface magnetometry is based on the measure of the spin polarization of the total photoejected electron yi eld by means of a Mott scattering experiment and on the acquisition sy nchronism with the multibunch structure of the positron storage ring S uperAco at Orsay (500 ps pulses at 120 ns intervals). We present resul ts on the fast magnetization reversal of Fe ultrathin films deposited on amorphous low-coercivity ferromagnetic ribbons. (C) 1998 American I nstitute of Physics. [S0021-8979(98)07303-4].