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:
Jul. 26, 1977
Filed:
Jan. 15, 1976
Frederik Willem Gorter, Eindhoven, NL;
Henricus Petrus Wijn, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A magnetoresistive detection device for determining the presence or absence of a single-wall magnetic domain at a position in a thin layer of magnetic material in which stable single-wall magnetic domains can be moved, comprising a sensing element of magnetoresistive material which is provided with respect to the layer of magnetic material in such manner that the resistance thereof varies when a single-wall magnetic domain is present at the said position. The device comprises means to produce an alternating magnetic field so as to modulate the size of a single-wall magnetic domain present at the said position, and comprises a filter which passes only interference-free terms of the signal detected by the sensing element.