Magnetic circuit and method of applying magnetic field
AssigneeShin-Etsu Chemical Co., Ltd.
InventorKen Ohashi
Life of this patent
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Abstract
In a magnetic circuit for providing magnetic anisotropy in the in-plane radial direction of a soft magnetic under layer, magnets for perpendicular magnetization are respectively provide on the north and south poles of a magnet for horizontal magnetization. When magnetic circuits configured thus are stacked in a plurality of stages, a magnetic field (air-gap magnetic field) formed in a gap between the magnetic circuits is superimposed by magnetic fields from the magnets for perpendicular magnetization as well as a magnetic field from the magnet for horizontal magnetization (in-plane magnetization). The pole faces of the magnets for perpendicular magnetization are disposed closer to the gap between the magnetic circuits, so that a stronger magnetic field can be formed in the gap.
Claims16
A magnetic circuit for storing a sample in a gap formed between a plurality of magnetic field application parts opposed to each other in parallel and applying a magnetic field to the sample,
- wherein each of the magnetic field application parts is configured by combining a plurality of permanent magnet segments,
- the permanent magnet segments include a first permanent magnet horizontally magnetized in parallel with an opposed surface of the magnet field application part,
- a second permanent magnet magnetized perpendicularly to the opposed surface of the magnetic field application part, the second permanent magnet being provided on a north pole of the first permanent magnet, and
- a third permanent magnet perpendicularly magnetized in an opposite direction from the second magnet, the third permanent magnet being provided on a south pole of the first permanent magnet.
Dependencies are inferred from the claim text.