The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 01, 2006
Filed:
Feb. 14, 2003
Yoshinori Tokura, Ibaraki, JP;
Masashi Kawasaki, Ibaraki, JP;
Hiroyuki Yamada, Ibaraki, JP;
Yoshihiro Ogawa, Ibaraki, JP;
Yoshio Kaneko, Chiba, JP;
Yoshinori Tokura, Ibaraki, JP;
Masashi Kawasaki, Ibaraki, JP;
Hiroyuki Yamada, Ibaraki, JP;
Yoshihiro Ogawa, Ibaraki, JP;
Yoshio Kaneko, Chiba, JP;
National Institute of Advanced Industrial Science and Technology, Tokyo, JP;
Japan Science and Technology Agency, Kawaguchi, JP;
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 () having electric polarization disposed with respect to a perpendicular recording medium (), and laser generating means acting on the magnetic sensor element (). The magnetic sensor reads information in the perpendicular recording medium () based on the variation of the rotation angle φ of the polarization plane of a second harmonic () of a frequency 2ω exiting the magnetic sensor element () by the application of laser light () with a frequency ω from the laser generation means to the magnetic sensor element ().