Magnetic recording media and magnetic recording system using the same

A magnetic recording system comprising:

• an in-plane magnetic recording medium having a magnetic layer formed on a plurality of underlayers formed on a substrate;
• a driver unit for driving said in-plane magnetic recording medium in a write direction;
• a magnetic head having a read unit and a write unit;
• means for moving said magnetic head relative to said in-plane magnetic recording medium;
• and
• read/write signal processing means for reading an output signal from said magnetic head and writing an input signal to said magnetic head,
• wherein the read unit of said magnetic head includes a magnetoresistive head and at least one of the plurality of underlayers includes Co-containing amorphous material or Co-containing fine crystal material.

A magnetic recording system comprising:

• an in-plane magnetic recording medium having a magnetic layer formed on a plurality of underlayers formed on a substrate;
• a driver unit for driving said in-plane magnetic recording medium in a write direction;
• a magnetic head having a read unit and a write unit;
• means for moving said magnetic head relative to said in-plane magnetic recording medium;
• and
• read/write signal processing means for reading an output signal from said magnetic head and writing an input signal to said magnetic head,
• wherein the read unit of said magnetic head includes a magnetoresistive head, at least one of the plurality of underlayers includes alloy material containing at least a first additive element and Co, the first additive element being selected from a first group consisting of Ti, Y, Zr, Nb, Mo, Hf, Ta, W, Si and B, and a product of a residual magnetic flux density by a layer thickness of the underlayer is 20% or less of a product of a residual magnetic flux density by a layer thickness of the magnetic layer.

A magnetic recording system comprising:

• an in-plane magnetic recording medium having a magnetic layer formed on one of a single underlayer and on a plurality of underlayers formed on a substrate;
• a driver unit for driving said in-plane magnetic recording medium in a write direction;
• a magnetic head having a read unit and a write unit;
• means for moving said magnetic head relative to said in-plane magnetic recording medium;
• and
• read/write signal processing means for reading an output signal from said magnetic head and writing an input signal to said magnetic head,
• wherein the read unit of said magnetic head includes a magnetoresistive head and one of the single underlayer and of the plurality of underlayers includes an alloy material, the alloy material having as main components at least one element selected from a third group consisting of Cr, Mo, V and Ta and containing at least one element selected from a fourth group consisting of B, C, P and Bi.