Spin Hall effect of light reflected from a magnetic thin film

The displacements for |P> polarization (electric field parallel to the plane-of-incidence) and |S> polarization (electric field perpendicular to the plane-of-incidence) induced by the spin Hall effect of light reflected from a magnetic cobalt thin film have been investigated. The significant differences from those of an air-glass interface are attributed to the special complex permittivity and refractive index of the cobalt film. The real part of the complex refractive index has more influence on displacements for |P> polarization than for |S> polarization. There also exists a particular incident angle corresponding to the zero displacement for |P> polarization. It shifts from 52° to 76° when the real part rises from 1.0 to 4.0. For both |P> and |S> polarizations, the maximal displacements rapidly rise with the decrease of the imaginary part. Our simulations further demonstrate that polarization-insensitive spin separations can be realized by choosing the medium with an optimal permeability.

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