Patent ID: 8460805
Filing Date: 2013-06-11
Classification: G11B,Y10T

Abstract:
1. An apparatus, comprising: a first magnetic layer comprising a plurality of grains, the first magnetic layer having a first anisotropy value (H a second magnetic layer comprising a plurality of grains and having stronger inter-granular exchange coupling than the first magnetic layer and a third magnetic layer, the second magnetic layer having a second anisotropy value (H 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 layer having an anisotropy value (H the third magnetic layer comprising a plurality of grains, the third magnetic layer having the third anisotropy value (H a second exchange tuning layer comprising a plurality of grains and located between the second and third magnetic layers.