Patent ID: 8107194
Filing Date: 2012-01-31
Classification: G11B

Abstract:
1. A method for writing magnetization states in a multi-layer continuous magnetic medium comprising a plurality of magnetic layers, each magnetic layer comprising magnetic material continuously distributed in an X-Y plane defined by an X direction and a Y direction orthogonal to each other, consecutive magnetic layers separated by non-magnetic spacer material and distributed along a Z direction orthogonal to the X-Y plane, said method comprising: selecting a magnetization state [S1; S2] comprising a magnetic state (S1) and a magnetic state (S2) in a first magnetic layer and in a second magnetic layer, respectively, of the plurality of magnetic layers, wherein magnetic states (S1) and (S2) are independent of each other, wherein α determining a write current (I) sufficient to write the magnetization state [S1; S2]; applying the write current I to a magnetic write head moving in the X direction to generate in the first magnetic layer and the second magnetic layer a magnetic field that exceeds a switching field of the first magnetic layer and a switching field of the second magnetic layer; responsive to said applying, said magnetic write head writing the magnetization state [S1; S2] by simultaneously writing the magnetic state S1 in the first magnetic layer and the magnetic state S2 in the second magnetic layer.