Patent ID: 6819531
Filing Date: 2004-11-16
Classification: B82Y,G11B

Abstract:
A magnetic recording and reading device having a transfer rate of not less than 50 MB/s comprising:a magnetic recording medium having an absolute value of normalized noise coefficient per recording density of not more than 2.5Ã—10âˆ’8 (&mgr;Vrms)(inch)(&mgr;m)0.5/(&mgr;Vpp); a magnetic head which is mounted on an integrated circuit suspension so that a total inductance is reduced to be not more than 65 nH and having a magnetic core which is not more than 35 &mgr;m of length, a part of the magnetic core being formed by a magnetic film having a resistivity exceeding at least 50 &mgr;&OHgr;cm or by a multilayer film consisting of a magnetic film and an insulating film; and a fast R/W-IC having a line width of not more than 0.35 &mgr;m which is installed in a position within 2 cm from a rear end of said magnetic head; wherein said magnetic head is provided with a reading element including a giant magnetoresistance effect element or a thin film having tunneling-magnetoresistance effect, with an effective track width of not more than 0.9 &mgr;m, and performs reading of magnetic information at an areal density of not less than 5 Gb/in2, and wherein said magnetic recording medium comprises (a) a magnetic layer containing at least one metal element selected from the group consisting of Co, Fe and Ni as a primary component, and 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 at least one element selected from a third group consisting La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Bi, Sb, Pb, Sn, Ge and B, and (b) a non-magnetic layer containing at least one kind of element selected from the group consisting of Cr, Mo, W, V, Nb, Ta, Zr, Hf, Ti, Ge, Si, Co, Ni, C, B, Pt, Ru and N.