Large Nonlinear Magneto-Optical Effect In The Centrosymmetric Ferromagnetic Semiconductor Euo
PHYSICAL REVIEW B(2010)
摘要
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(t(2g)) states of the Eu(2+) 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 <1 mu m although pinning effects can stabilize domains that are two orders of magnitude larger.
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关键词
magnetic semiconductor,harmonic generation,ground state,higher order,spectrum,second harmonic generation
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