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:
Oct. 26, 2021
Filed:
Aug. 20, 2019
International Business Machines Corporation, Armonk, NY (US);
Richard Bradshaw, Tucson, AZ (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
In one general approach, a product includes an underlayer of a magnetic recording medium. The underlayer has encapsulated nanoparticles each comprising a magnetic nanoparticle encapsulated by an aromatic polymer, and a polymeric binder binding the encapsulated nanoparticles. A magnetic recording layer is formed above the underlayer. In another general approach, a product includes an electrically conductive underlayer of a magnetic recording medium. The underlayer has encapsulated nanoparticles each comprising a magnetic nanoparticle encapsulated by an aromatic polymer, and a polymeric binder binding the encapsulated nanoparticles. A magnetic recording layer is formed above the underlayer. The magnetic nanoparticles have an average magnetic field strength of less than 200 Oersted (Oe). An average concentration of the encapsulated nanoparticles in the underlayer is at least 35 vol %.