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

A magnetic head, comprising:

• a first magnetic pole;
• a second magnetic pole;
• and
• a magnetic element provided between the first magnetic pole and the second magnetic pole,
• the magnetic element including
• a first magnetic layer,
• 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 fourth magnetic layer provided between the third magnetic layer and the second magnetic pole,
• a first non-magnetic layer provided between the first magnetic pole and the first magnetic layer,
• a second non-magnetic layer provided between the first magnetic layer and the second magnetic layer,
• a third non-magnetic layer provided between the second magnetic layer and the third magnetic layer,
• a fourth non-magnetic layer provided between the third magnetic layer and the fourth magnetic layer, and
• a fifth non-magnetic layer provided between the fourth magnetic layer and the second magnetic pole,
• the fourth magnetic layer including a first element and at least one of Fe, Co or Ni, the first clement including at least one selected from a group consisting of Cr, V, Mn, N and Sc,
• the fourth non-magnetic layer including at least one selected from a group consisting of Cu, Au, Cr, Al, V and Ag, and
• the fifth non-magnetic layer including at least one selected from the group consisting of Cu, Au, Cr, Al, V and Ag,
• wherein
• the first magnetic layer, the second magnetic layer and the third magnetic layer include at least one of Fe, Co or Ni, and
• the first magnetic layer, the second magnetic layer, and the third magnetic layer do not include the first element, or a concentration of the first element in the first magnetic layer, the second magnetic layer, and the third magnetic layer is lower than a concentration of the first element in the fourth magnetic layer.

A magnetic head, comprising:

• a first magnetic pole;
• a second magnetic pole;
• and
• a magnetic element provided between the first magnetic pole and the second magnetic pole,
• the magnetic element including
• a first magnetic layer,
• 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 fourth magnetic layer provided between the third magnetic layer and the second magnetic pole,
• a first non-magnetic layer provided between the first magnetic pole and the first magnetic layer,
• a second non-magnetic layer provided between the first magnetic layer and the second magnetic layer,
• a third non-magnetic layer provided between the second magnetic layer and the third magnetic layer,
• a fourth non-magnetic layer provided between the third magnetic layer and the fourth magnetic layer, and
• a fifth non-magnetic layer provided between the fourth magnetic layer and the second magnetic pole,
• the fourth magnetic layer including a first element and at least one of Fe, Co or Ni, the first element including at least one selected from a group consisting of Cr, V, Mn, Ti, N and Sc,
• the fourth non-magnetic layer including at least one selected from a group consisting of Cu, Au, Cr, Al, V and Ag, and
• the fifth non-magnetic layer including at least one selected from the group consisting of Cu, Au, Cr, Al, V and Ag,
• wherein
• the first magnetic layer, the second magnetic layer and the third magnetic layer include at least one of Fe, Co or Ni, and
• the first magnetic layer, the second magnetic layer, and the third magnetic layer do not include the first element, or a concentration of the first element in the first magnetic layer, the second magnetic layer, and the third magnetic layer is lower than a concentration of the first element in the fourth magnetic layer,
• the fourth magnetic layer has negative polarization.