Element selective X-ray Detected Magnetic Resonance

Element selective X-ray Detected Magnetic Resonance (XDMR) was measured on exciting the Fe K-edge and Y L-edges in a high quality Yttrium Iron Garnet (YIG) thin film. Resonant pumping at high microwave power was achieved in the non-linear foldover regime and X-ray Magnetic Circular Dichroism (XMCD) was used to probe the time-invariant change of the magnetization ΔMz due to the precession of the relevant magnetization components at the Fe or Y sites. Emphasis is laid on the pure orbital character of the effective operators responsible for a K-edge XDMR signal. At the spin-orbit split Y L-edges, extended dynamical sum-rules are required to disentangle the forced precession of the spin and orbital magnetization components.