Magnetic head and magnetic recording device having magnetic layers and non-magnetic layers between shield and magnetic pole

A magnetic head, comprising:

• a shield;
• a magnetic pole;
• a first magnetic layer provided between the shield and the magnetic pole;
• a second magnetic layer provided between the first magnetic layer and the magnetic pole;
• a third magnetic layer provided between the second magnetic layer and the magnetic pole;
• a first nonmagnetic layer provided between the shield and the first magnetic layer;
• a second nonmagnetic layer provided between the first magnetic layer and the second magnetic layer;
• a third nonmagnetic layer provided between the second magnetic layer and the third magnetic layer;
• a fourth nonmagnetic layer provided between the third magnetic layer and the magnetic pole;
• a fifth nonmagnetic layer;
• and
• a sixth nonmagnetic layer,
• the first nonmagnetic layer and the third nonmagnetic layer including at least one selected from the group consisting of Cu, Ag, Au, Al, and Ti,
• the second nonmagnetic layer and the fourth nonmagnetic layer including at least one selected from the group consisting of Ta, Pt, Ir, W, Mo, Cr, Tb, Rh, Pd, and Ru,
• thicknesses along a first direction of the second nonmagnetic layer and the fourth nonmagnetic layer each being not less than 1 nm and not more than 3 nm, the first direction being from the shield toward the magnetic pole,
• the fifth nonmagnetic layer being provided between the second nonmagnetic layer and the first magnetic layer,
• the sixth nonmagnetic layer being provided between the second magnetic layer and the second nonmagnetic layer,
• the fifth nonmagnetic layer and the sixth nonmagnetic layer including at least one selected from the group consisting of Cu, Ag, Au, Al, Ti, and Ru,
• thicknesses along the first direction of the fifth nonmagnetic layer and the sixth nonmagnetic layer each being not less than 1 nm and not more than 3 nm.

A magnetic recording device, comprising:

• a magnetic head;
• and
• a circuit portion,
• the magnetic head, comprising:
• a shield;
• a magnetic pole;
• a first magnetic layer provided between the shield and the magnetic pole;
• a second magnetic layer provided between the first magnetic layer and the magnetic pole;
• a third magnetic layer provided between the second magnetic layer and the magnetic pole;
• a first nonmagnetic layer provided between the shield and the first magnetic layer;
• a second nonmagnetic layer provided between the first magnetic layer and the second magnetic layer;
• a third nonmagnetic layer provided between the second magnetic layer and the third magnetic layer;
• and
• a fourth nonmagnetic layer provided between the third magnetic layer and the magnetic pole,
• the first nonmagnetic layer and the third nonmagnetic layer including at least one selected from the group consisting of Cu, Ag, Au, Al, and Ti,
• the second nonmagnetic layer and the fourth nonmagnetic layer including at least one selected from the group consisting of Ta, Pt, Ir, W, Mo, Cr, Tb, Rh, Pd, and Ru,
• thicknesses along a first direction of the second nonmagnetic layer and the fourth nonmagnetic layer each being not less than 1 nm and not more than 3 nm, the first direction being from the shield toward the magnetic pole,
• the circuit portion being configured to supply a first current having an orientation from the first nonmagnetic layer toward the fourth nonmagnetic layer, the orientation of the first current being opposite to an orientation of an electron flow.