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:
Nov. 20, 2018
Filed:
Mar. 12, 2018
Seagate Technology Llc, Cupertino, CA (US);
Kangkang Wang, Fremont, CA (US);
Xiaobin Zhu, San Ramon, CA (US);
Ganping Ju, Pleasanton, CA (US);
Kai Chieh Chang, Pleasanton, CA (US);
Yingguo Peng, San Ramon, CA (US);
Timothy J. Klemmer, Union City, CA (US);
Jan-Ulrich Thiele, Sunnyvale, CA (US);
Pin-Wei Huang, Fremont, CA (US);
Seagate Technology LLC, Cupertino, CA (US);
Abstract
An apparatus comprises a spindle to rotate a magnetic recording medium and a magnetic field generator to expose a track of the medium to a DC magnetic field. The magnetic field generator is configured to saturate the track during an erase mode and reverse the DC magnetic field impinging the track during a writing mode. A laser arrangement heats the track during the erase mode and, during the writing mode, heats the track while the track is exposed to the reversed DC magnetic field so as to write a magnetic pattern thereon. A reader reads the magnetic pattern and generates a read signal. A processor is coupled to the reader and configured to determine an anisotropy parameter using the read signal. The apparatus can further comprise a Kerr sensor that generates a Kerr signal using the magnetic pattern.