Magnetoresistance Element Magnetic Random Access Memory, Magnetic Head and Magnetic Storage Device

A manufacturing method of a magnetoresistance element, said method comprising:

• a process of forming an antiferromagnetic layer on an upper surface side of a substrate;
• a process of forming a fixed ferromagnetic layer on said antiferromagnetic layer;
• a process of forming a first nonmagnetic layer on said fixed ferromagnetic layer;
• and
• a process of forming a free ferromagnetic layer on said first nonmagnetic layer,
• wherein the process of forming said fixed ferromagnetic layer includes a process of forming an amorphous layer,
• wherein said amorphous layer contains amorphous material having a composition expressed by a chemical formula of X—Y-Z,
• wherein X represents at least one element selected from Co, Fe and Ni,
• wherein Y represents at least one element selected from Al, Si, Mg, Ta, Nb, Zr, Hf, W, Mo, Ti and V,
• wherein Z represents at least one element selected from N, C and B.

A magnetic head comprising:

• a reproducing element;
• a first magnetic core disposed apart from said reproducing element;
• a second magnetic core disposed apart from said first magnetic core so as to form a predetermined gap on an opposite side of said reproducing element with respect to said first magnetic core;
• and
• a coil disposed between said first magnetic core and said second magnetic core and separated therefrom by an insulating layer,
• wherein said reproducing element includes:
• two electrodes provided in a shield;
• and
• a magnetoresistance element, held between said two electrodes,
• wherein said magnetoresistance element comprising:
• an antiferromagnetic layer;
• a fixed ferromagnetic layer formed on said antiferromagnetic layer;
• a first nonmagnetic layer formed on said fixed ferromagnetic layer;
• and
• a free ferromagnetic layer formed on said first nonmagnetic layer,
• wherein said fixed ferromagnetic layer is provided with an amorphous layer,
• wherein said amorphous layer contains amorphous material having a composition expressed by a chemical formula of X—Y-Z,
• wherein X represents at least one element selected from Co, Fe and Ni,
• wherein Y represents at least one element selected from Al, Si, Mg, Ta, Nb, Zr, Hf, W, Mo, Ti and V, and
• wherein Z represents at least one element selected from N, C and B.

A magnetic recording device comprising:

• a motor rotating a magnetic recording medium;
• a magnetic head for recording and reproducing data onto or from said magnetic recording medium;
• a holding unit holding said magnetic head;
• a moving unit moving said holding unit;
• a recording/reproducing unit driving said magnetic head;
• and
• a control unit controlling said moving unit and said recording/reproducing unit,
• wherein said magnetic head includes:
• a reproducing element;
• a first magnetic core disposed apart from said reproducing element;
• a second magnetic core disposed apart from said first magnetic core so as to form a predetermined gap on an opposite side of said reproducing element with respect to said first magnetic core;
• and
• a coil disposed between said first magnetic core and said second magnetic core and separated therefrom by an insulating layer,
• wherein said reproducing element comprises:
• two electrodes provided in a shield;
• and
• a magnetoresistance element held between said two electrodes,
• wherein said magnetoresistance element includes:
• an antiferromagnetic layer;
• a fixed ferromagnetic layer formed on said antiferromagnetic layer;
• a first nonmagnetic layer formed on said fixed ferromagnetic layer;
• and
• a free ferromagnetic layer formed on said first nonmagnetic layer,
• wherein said fixed ferromagnetic layer is provided with an amorphous layer,
• wherein said amorphous layer contains amorphous material having a composition expressed by a chemical formula of X—Y-Z,
• wherein X represents at least one element selected from Co, Fe and Ni,
• wherein Y represents at least one element selected from Al Si, Mg, Ta, Nb, Zr, Hf, W, Mo, Ti and V, and
• wherein Z represents at least one element selected from N, C and B.