Magnetic head with multilayer configuration between magnetic poles and magnetic recording device

A magnetic head comprising:

• a first magnetic pole;
• a second magnetic pole;
• a conductive part electrically insulated from the first magnetic pole and the second magnetic pole;
• a first terminal and a second terminal electrically connected to the conductive part;
• an element part provided between the first magnetic pole and the second magnetic pole and electrically connected to the first magnetic pole and the second magnetic pole, the element part being conductive;
• a third terminal electrically connected to the first magnetic pole;
• and
• a fourth terminal electrically connected to the second magnetic pole,
• a first potential of the first magnetic pole in a first state being higher than a second potential of the second magnetic pole in the first state, a first current being supplied between the first terminal and the second terminal in the first state, and
• a current being not supplied between the third terminal and the fourth terminal in the first state,
• wherein
• the element part includes
• a first magnetic pole side magnetic layer, and
• a non-magnetic intermediate layer,
• the first magnetic pole side magnetic layer is provided between the first magnetic pole and the non-magnetic intermediate layer,
• the non-magnetic intermediate layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al and Ag, and
• the first magnetic pole side magnetic layer includes
• at least one selected from the group consisting of Fe, Co, and Ni, and
• at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc,
• the first magnetic pole side magnetic layer physically contacts the first magnetic pole and the non-magnetic intermediate layer,
• the element part further includes a first stacked body,
• the non-magnetic intermediate layer is between the first magnetic pole side magnetic layer and the first stacked body,
• the first stacked body includes:
• a first magnetic layer provided between the non-magnetic intermediate layer and the second magnetic pole,
• a second magnetic layer provided between the first magnetic layer and the second magnetic pole,
• a third magnetic layer provided between the second magnetic layer and the second magnetic pole,
• a first non-magnetic layer provided between the first magnetic layer and the second magnetic layer,
• a second non-magnetic layer provided between the second magnetic layer and the third magnetic layer, and
• a third non-magnetic layer provided between the third magnetic layer and the second magnetic pole.