US 2005/0012937 A1 · Magnetic sensor

Abstract

The present invention provides a magnetic sensor capable of reproducing a magnetic record even if the size of a recorded magnetization is a minute one, directly reading a magnetization recorded on a magneto-optical disk without applying incident light itself to the magneto-optical disk, and obtaining signals of a second harmonic having a high S/N ratio. This magnetic sensor includes a magnetic sensor element (102) having electric polarization disposed with respect to a perpendicular recording medium (101), and laser generating means acting on the magnetic sensor element (102). The magnetic sensor reads information in the perpendicular recording medium (101) based on the variation of the rotation angle φ of the polarization plane of a second harmonic (105) of a frequency 2ω exiting the magnetic sensor element (102) by the application of laser light (104) with a frequency ω from the laser generation means to the magnetic sensor element (102).

Claims19

Dependent claims

A magnetic sensor comprising:

(a) a magnetic sensor element that is disposed with respect to a body having spin information, that has an interface structure having spatial asymmetry, and in which one solid material constituting the interface is a magnetic material;
(b) laser beam irradiation means acting on the magnetic sensor element;
and
(c) the magnetic sensor reading out the spin information of the body having the spin information based on the variation of the rotation angle of the polarization plane of a second harmonic with a frequency 2ω exiting the magnetic sensor element, by applying laser light with a frequency ω to the magnetic sensor element by the laser beam irradiation means.

1 more element

Dependencies are inferred from the claim text.

Magnetic sensor

Life of this patent

Magnetic sensor

Life of this patent

Abstract

Claims19