Magnetization-induced second harmonic generation of light by exchange-coupled magnetic layers
2005
A longitudinal magneto-optical Kerr effect and magnetization-induced
second-harmonic generation (MSHG) of light (at 2omega) have been measured in a
SiO2/Fe96Si4/Dy30Fe58Co12/glass exchange-coupled magnetic bilayer system with
competitive anisotropies. Theoretical MSHG predictions in this structure that give rise
to an effect proportional to magnetization components and that are allowed by an
electric dipole mechanism are reported and discussed. The magnitude of the MSHG effect
depends on the electric field of the incoming radiation at each interface and on the
corresponding incoming (at omega) and outgoing (at 2omega) Fresnel coefficients. It is
demonstrated that transverse pp MSHG selectively probes the magnetization of the first
SiO2/Fe96Si4 interface, while transverse sp and longitudinal ps MSHG is sensitive, but
less selectively, to the Fe96Si4/Dy30Fe58Co12 interface that supports a planar magnetic
domain wall. (p and s are the usual parallel and perpendicular polarizations to the
plane of incidence.) The contribution to MSHG by gradient magnetization terms is
negligible.
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