Pronounced magnetic-dipole-induced second-harmonic generation (SHG) is observed in epitaxial films of the ferromagnetic semiconductor EuO. The SHG light wave emerges background-free at the Curie temperature and couples linearly to the spontaneous magnetization. The SHG spectrum is determined by spin-allowed and spin-forbidden transitions between the 4f ground state and the 5d (t2g) states of the Eu2+ ion. At the coercive field, components of the spontaneous magnetization perpendicular to the applied field are observed. Spatially resolved hysteresis measurements reveal that the ferromagnetic domains possess an average extension of <1μm although pinning effects can stabilize domains that are two orders of magnitude larger.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2010 Jun 30|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics