Planar Patterned Magnetic Media Obtained by Ion Irradiation

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Science  19 Jun 1998:
Vol. 280, Issue 5371, pp. 1919-1922
DOI: 10.1126/science.280.5371.1919

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By ion irradiation through a lithographically made resist mask, the magnetic properties of cobalt-platinum simple sandwiches and multilayers were patterned without affecting their roughness and optical properties. This was demonstrated on arrays of 1-micrometer lines by near- and far-field magnetooptical microscopy. The coercive force and magnetic anisotropy of the irradiated regions can be accurately controlled by the irradiation fluence. If combined with high-resolution lithography, this technique holds promise for ultrahigh-density magnetic recording applications.

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