%0 Journal Article
%T Precessional dynamics of elemental moments in a ferromagnetic alloy
%A W. E. Bailey
%A L. Cheng
%A D. Keavney
%A C. -C. Kao
%A E. Vescovo
%A D. Arena
%J Physics
%D 2004
%I arXiv
%R 10.1103/PhysRevB.70.172403
%X We demonstrate an element-specific measurement of magnetization precession in a metallic ferromagnetic alloy, separating Ni and Fe moment motion in Ni81Fe19. Pump-probe X-ray magnetic circular dichroism (XMCD), synchronized with short magnetic field pulses, is used to measure free magnetization oscillations up to 2.6 GHz with elemental specificity and a rotational resolution of < 2 deg. Magnetic moments residing on Ni sites and Fe sites in a Ni81Fe19(50nm) thin film are found to precess together at all frequencies, coupled in phase within instrumental resolution of 90 ps.
%U http://arxiv.org/abs/cond-mat/0405295v1