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:
Jan. 12, 1999
Filed:
Dec. 19, 1996
Jon Shaochung Hsu, Taipei, TW;
Sony Corporation, Tokyo, JP;
Materials Research Corporation, Orangeburg, NY (US);
Abstract
Magnetic domains in a thin magnetic film on information storage devices are aligned during manufacture of the device, preferably at the time the film is deposited onto a substrate by sputtering. A compact magnetic field generator generates a parallel magnetic field across the substrate with a magnet assembly that is not larger than approximately twice the size of the substrate or not larger than the sputtering target cathode assembly. The magnet assembly includes an interior magnet with poles at opposite ends of the substrate and two side magnets having pole pieces spaced by an air gap from the poles of the interior magnet. The interior magnet preferably includes a central magnet and two intermediate magnets, which share the same pole pieces as the central magnet. The interior magnets are located between the central magnet and the side magnets. The magnets, which are preferably electromagnets, are adjusted by varying the current therethrough, preferably by adjusting the current of the intermediate magnets, or by moving the pole pieces to adjust the gaps between those of the side and interior magnets, until the field is parallel to within one degree. Magnetic devices, such as read and write heads, are produced from products of the process.