Abstract
Magneto-optic (MO) response in nanostructures with ultrathin Fe considered for the MO mapping of current pulses with a two-dimensional diffraction limited resolution is investigated in detail. The structures consist of an ultrathin Fe layer sandwiched with dielectric layers, deposited on a reflector and covered by a noble metal protecting layer.
The structures are modeled as five-layer systems with abrupt interfaces. Analytical expressions are provided that are useful in the search for the maximum of MO reflected wave amplitude polarized perpendicular to the incident linearly polarized wave, vertical bar r(yx)((05))vertical bar.
The procedure of finding the maximal vertical bar r(yx)((05))vertical bar is illustrated on the structures with ultrathin Fe at the laser wavelength of 632.8 nm. The maximal vertical bar r(yx)((05))vertical bar of 0.018347 was achieved in the structure AlN(52 nm)/Fe(15 nm)/AlN(26 nm)/Au.
The deposition of a 5 nm protecting Au layer reduced vertical bar r(yx)((05))vertical bar by 6 per cent. (C) 2013 Optical Society of America