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An outline is given of a technique for designing quadrilayers that enhance the magneto-optic polar Kerr effect by maximizing the signal-to-noise ratio associated with readout systems utilizing differential detection. The method is particularly novel in that it produces maximized Kerr rotations with controllable ellipticities by using a systematic design procedure that does not involve computer-driven iterative techniques that search for optimum film structures. A number of quadrilayers, based on the ZnS–TbFeCo–ZnS–Al system, have been prepared using rf and dc sputtering and conventional evaporation techniques. The performance of the devices in terms of the basic optical and magneto-optical functions is good compared with theoretical predictions, both at the design wavelength and at all other regions of the spectrum, in the range 400–800 nm.
© 1992 Optical Society of America
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