Switching field controlled (SFC) media using anti-ferromagnetic thin layer in magnetic recording

• Main Authors: MOON KISEOK, CHE CARL (XIAO), HONG SOOYOUL
• Format: Patent
• Language: English
• Published: 24.09.2009
• Subjects: APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PERFORMING OPERATIONS; PHYSICS; PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; SPRAYING OR ATOMISING IN GENERAL; TRANSPORTING

A patterned disk for a hard disk drive. The patterned disk includes an anti-ferromagnetic layer of FexNi1-xO over a substrate. The disk also includes a magnetic layer that is adjacent to the anti-ferromagnetic layer of FexNi1-xO, and is formed into a plurality of dots separated by a non-magnetic material. The anti-ferromagnetic layer of FexNi1-xO with the magnetic layer create an exchange-spring system that has a relatively low switching field. The anti-ferromagnetic layer of FexNi1-xO has a Neel temperature that maintains thermal stability. The low switching field improves reliability when the disk is a bit pattern media used in perpendicular recording.