High density dual gap magnetic head using polar Kerr effect
AssigneeSony Corporation
InventorsYoshitaka Ochiai, Hideki Matsuda, Takehiro Nagaki, Shunichi Hashimoto
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Abstract
A magnetic head comprising a magnetic path and a vertically magnetizable film. The magnetic path contains a first gap facing a magnetic recording medium and a second gap. The vertically magnetizable film is formed across the second gap on the principal plane or outer circumference of the magnetic path. A linearly polarized light beam is irradiated onto the vertically magnetizable film and the resulting reversal of magnetization in the vertically magnetizable film is detected through the use of a polar Kerr effect. This scheme allows data to be reproduced with sufficient sensitivity from tracks of very small widths.
Claims14
A magnetic head comprising:
- a magnetic member in the form of a planar ring and defining a magnetic path having a first and a second gap, said first gap facing a magnetic recording medium;
- and
- a vertically magnetizable film formed across said second gap parallel to the plane of said ring;
- wherein the state of magnetization in said vertically magnetizable film is detected through the use of a polar Kerr effect, when a linearly polarized light beam is irradiated onto said vertically magnetizable film.
A magnetic head comprising:
- a magnetic member in the form of a planar ring and defining a magnetic path having a first and a second gap, said first gap facing a magnetic recording medium;
- and
- a vertically magnetizable film formed across said second gap on the outer circumference of said ring;
- wherein the state of magnetization in said vertically magnetizable film is detected through the use of a polar Kerr effect, when a linearly polarized light beam is irradiated onto said vertically magnetizable film.
Dependencies are inferred from the claim text.