Patent ID: 8861120
Filing Date: 2014-10-14
Classification: G11B

Abstract:
1. A magnetic medium comprising at least one recording layer, the recording layer comprising: a first magnetic layer made of a first magnetic material having a first magnetic anisotropy, data item being written to the first magnetic layer in accordance with the magnetization direction; a second magnetic layer made of a second magnetic material having a second magnetic anisotropy smaller than the first magnetic anisotropy, wherein coercivity of the second magnetic layer is smaller than a strength of a magnetic field of antiparallel coupling between the first magnetic layer and the second magnetic layer; and a non-magnetic layer made of a non-magnetic material and being between the first magnetic layer and the second magnetic layer, the first magnetic layer and the second magnetic layer being coupled such that directions of magnetization of the first magnetic layer and the second magnetic layer are opposed to each other by magnetic exchange via the non-magnetic layer.