Patent ID: 7782566

Claim:
A magnetic recording and reading device which comprises: a magnetic recording medium having a substrate and at least one magnetic recording layer formed above the substrate; a magnetic head comprising a recording head having an upper magnetic core and a lower magnetic core with a magnetic core length l 1 of not more than 35 μm, a reading head provided with a read element having a track width of not more than 0.9 μm, and a heat-generating portion which enables heating of the magnetic recording medium; and a R/W-IC; wherein the at least one magnetic recording layer contains (1) at least one metal element selected from a first group consisting of Co, Fe and Ni as a primary component, (2) at least two elements selected from a second group consisting of Cr, Mo, W, V, Nb, Ta, Ti, Zr, Hf, Pd, Pt, Rh, Ir and Si, and (3) at least one element selected from a third group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Bi, Sb, Pb, Sn, Ge and B; and wherein the magnetic head is configured to perform magnetic recording on the magnetic recording medium by application of a magnetic field from the magnetic head while the heat-generating portion of the magnetic head locally heats the magnetic recording medium so as to enable a change of the coercive force of the magnetic recording medium during the information recording, and to perform reading of the magnetic recording information with the aid of the reading head.