Patent ID: 8045294
Filing Date: 2011-10-25
Classification: B82Y,G11B

Abstract:
1. A slider for writing information in and reading information from a magnetic storage layer, comprising a metal film, an opening being formed on a surface of the metal film, a plurality of axes crossing each other substantially perpendicularly at the opening, a first periodic groove, a second periodic groove, a third periodic groove, and a fourth periodic groove being provided for respective axes, and each of the first, second, third, and fourth periodic grooves including a plurality of grooves substantially perpendicular to the axis for which each periodic groove is provided, a distance between adjacent grooves of the plurality of grooves being a distance that allows surface plasmon to be excited when light is incident to the metal film, the first, second, third, and fourth periodic grooves being positioned point-symmetrically with respect to the opening, the second periodic groove being positioned counterclockwise by substantially 90 degrees from the first periodic groove around the opening, the third periodic groove being positioned counterclockwise by substantially 90 degrees from the second periodic groove around the opening, the fourth periodic groove being positioned counterclockwise by substantially 90 degrees from the third periodic groove around the opening, and relations L