Patent ID: 9224411
Filing Date: 2015-12-29
Classification: G11B,Y10T

Abstract:
1. An apparatus, comprising: a first magnetic layer comprising a plurality of grains having grain boundaries and a grain core, the first magnetic layer having a first anisotropy value (H a second magnetic layer comprising a plurality of grains having grain boundaries and a grain core, the second magnetic layer having a second anisotropy value (H a third magnetic layer comprising a plurality of grains having grain boundaries and a grain core, the third magnetic layer having a third anisotropy value (H the first magnetic layer, the second magnetic layer, or both the first and second magnetic layers comprising doped ferromagnetic materials; an exchange tuning layer comprising a plurality of grains and located between the first and second magnetic layers, the exchange tuning layer having stronger inter-granular exchange coupling than the first and second magnetic layers, the exchange tuning layers having an anisotropy value (H a heat sink layer.