ABSTRACT
X-raymagnetic dichroism is a spectroscopic effect encountered for X-ray scattering
in resonancewith transitions of inner shell electrons froma spin orbit split level. As
detailed in Chap. 2, one distinguishes X-ray magnetic circular dichroism (XMCD)
and X-ray magnetic linear dichroism (XMLD), depending on the polarization state
of the incident X-rays used in the experiment. These contrast mechanisms couple
to the spin and orbital momentum of electrons in matter, which give rise to a local
magnetic moment at specific atoms in the material [Sto¨hr and Siegmann (2006)].
These magneto-optic effects in the extreme ultraviolet and X-ray regime are strong
and can reach about 40% relative signal change for two different magnetization
states. From a scattering perspective, XMCD and XMLD can be described via the
dependence of the scattering factors on the local magnetic moment M. Following [Hannon et al. (1988)], the scattering factors f for resonant magnetic scattering
dipole transitions can be expressed in terms of the local magnetic moment M, and
the polarization of the incident (e) and scattered (e′) X-rays.
