Patent ID: 9142239
Filing Date: 2015-09-22
Classification: G11B

Abstract:
1. A magnetic storage medium, comprising: a magnetic domain comprising a first magnetic material having a first coercivity and a first magnetic moment density; a substantially non-magnetic region laterally adjacent to the magnetic domain; and an exchange spring structure surrounding sides of the magnetic domain, surrounding sides of the substantially non-magnetic region, and surrounding a bottom of the substantially non-magnetic region, the exchange spring structure being disposed between the magnetic domain and the non-magnetic region, wherein the exchange spring structure comprises a second magnetic material having a second coercivity and a second magnetic moment density, wherein the second coercivity is lower than the first coercivity, the second magnetic moment density is lower than the first magnetic moment density, or the second coercivity is lower than the first coercivity and the second magnetic moment density is lower than the first magnetic moment density.