Patent ID: 8107194

Claim:
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 1 * and α 2 * are a first tilt angle and a second tilt angle at which a hard axis of the first magnetic layer and the second magnetic layer are respectively oriented with respect to the X direction, and wherein both of α 1 * and α 2 * differ from 0, 90, 180 and 270 degrees, and wherein −90<α 1 *<0 and/or −90<α 2 *<0; 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.