Below-diffraction-limited hybrid recording using silicon thin film super-resolution structure |
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Authors: | Jiao Xin-Bing Wei Jing-Song and Gan Fu-Xi |
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Institution: | Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China |
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Abstract: | We report on new experimental results for
below-diffraction-limited hybrid recording. In our experiments, by
means of focused laser assisted magnetic recording, the magnetic
domains within TbFeCo thin films are obtained under an external
perpendicular direct magnetic field. For a single magnetic medium,
the domain size is mainly determined by the focused spot, which is
about 620~nm for the laser wavelength λ =406~nm, and
a numerical aperture of the lens of 0.80. However, when a silicon thin
film structure is inserted between the substrate and the magnetic medium,
the recording domains can be reduced obviously. By optimizing the
experimental condition, even the size can be reduced to about
100~nm, which is below the diffraction limit, i.e. about 1/6 of the spot
size. This is very useful for improving the hybrid recording density
in practical applications. |
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Keywords: | hybrid recording super-resolution magnetic recording |
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