Magnetic head and magnetic recording device
According to one embodiment, a magnetic recording head includes a first magnetic pole, a second magnetic pole, and a stacked body provided between the first magnetic pole and the second magnetic pole. The stacked body includes a first magnetic layer, a second magnetic layer provided between the first 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 second magnetic pole, and a third non-magnetic layer provided between the first magnetic pole and the first magnetic layer. The first magnetic layer includes a first element including at least one of Fe, Co, or Ni. The second magnetic layer includes the first element, and a second element including at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc.
1. A magnetic recording head, comprising:
a first magnetic pole;
a second magnetic pole; and
a stacked body provided between the first magnetic pole and the second magnetic pole,
the stacked body including
a first magnetic layer,
a second magnetic layer provided between the first 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 second magnetic pole, and
a third non-magnetic layer provided between the first magnetic pole and the first magnetic layer,
the first magnetic layer including a first element including at least one of Fe, Co, or Ni,
the second magnetic layer including the first element, and a second element including at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc,
the first magnetic layer not including the second element, or a concentration of the second element in the first magnetic layer being lower than a concentration of the second element in the second magnetic layer, and
a first thickness of the first magnetic layer along a first direction from the first magnetic pole toward the second magnetic pole being not less than 0.25 times and not more than 4 times a second thickness of the second magnetic layer along the first direction,
and further comprising an electric circuit configured to generate a current in the stacked body in a direction from the first magnetic layer toward the second magnetic layer.
2. The head according to claim 1 , wherein
the first thickness is not less than 0.33 times the second thickness.
3. The head according to claim 1 , wherein
the third non-magnetic layer contacts the first magnetic pole and the first magnetic layer.
4. The head according to claim 1 , wherein
the first non-magnetic layer contacts the first magnetic layer and the second magnetic layer.
5. The head according to claim 1 , wherein
the second non-magnetic layer contacts the second magnetic layer and the second magnetic pole.
6. The head according to claim 1 , wherein
at least one of the first non-magnetic layer, the second non-magnetic layer, or the third non-magnetic layer includes a third element including at least one selected from the group consisting of Cu, Au, Cr, V, Al, or Ag.
7. The head according to claim 1 , wherein
the second thickness is not less than 5 nm.
8. The head according to claim 1 , wherein
the first thickness is not less than 5 nm.
9. The head according to claim 1 , wherein
a sum of the first thickness and the second thickness is not less than 15 nm.
10. The head according to claim 1 , wherein
the first magnetic layer includes a first magnetic region and a second magnetic region,
the second magnetic region is between the first magnetic region and the first non-magnetic layer, and
saturation magnetization of the first magnetic region is larger than saturation magnetization of the second magnetic region.
11. The head according to claim 1 , wherein
the first magnetic layer includes a first magnetic region and a second magnetic region,
the second magnetic region is between the first magnetic region and the first non-magnetic layer, and
a concentration of Fe in the first magnetic region is higher than a concentration of Fe in the second magnetic region.
12. The head according to claim 1 , wherein
the stacked body further includes a third magnetic layer,
the third magnetic layer is provided between the second magnetic layer and the second non-magnetic layer,
the third magnetic layer includes a first element including at least one of Fe, Co, or Ni, and
the third magnetic layer does not include the second element, or a concentration of the second element in the third magnetic layer is lower than a concentration of the second element in the second magnetic layer.
13. The head according to claim 1 , wherein
a concentration of the second element in the second magnetic layer is not less than 10 atomic % and not more than 80 atomic %.
14. The head according to claim 1 , wherein
an alternating magnetic field is generated from the stacked body when the current is supplied to the stacked body.
15. A magnetic recording device, comprising:
the magnetic head according to claim 1 .
16. The device according to claim 15 , wherein
when the electric circuit supplies the current to the stacked body, an alternating magnetic field is generated from the stacked body.
17. A magnetic recording head, comprising:
a first magnetic pole;
a second magnetic pole; and
a stacked body provided between the first magnetic pole and the second magnetic pole,
the stacked body including
a first magnetic layer,
a second magnetic layer provided between the first 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 second magnetic pole, and
a third non-magnetic layer provided between the first magnetic pole and the first magnetic layer,
the first magnetic layer including a first element including at least one of Fe, Co, or Ni,
the second magnetic layer including the first element, and a second element including at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc,
the first magnetic layer not including the second element, or a concentration of the second element in the first magnetic layer being lower than a concentration of the second element in the second magnetic layer, and
a first thickness of the first magnetic layer along a first direction from the first magnetic pole toward the second magnetic pole being not less than 0.25 times and not more than 4 times a second thickness of the second magnetic layer along the first direction,
wherein
the second magnetic layer includes a third magnetic region and a fourth magnetic region,
the fourth magnetic region is between the third magnetic region and the first non-magnetic layer, and
saturation magnetization of the third magnetic region is larger than saturation magnetization of the fourth magnetic region.
18. A magnetic recording head, comprising:
a first magnetic pole;
a second magnetic pole; and
a stacked body provided between the first magnetic pole and the second magnetic pole,
the stacked body including
a first magnetic layer,
a second magnetic layer provided between the first 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 second magnetic pole, and
a third non-magnetic layer provided between the first magnetic pole and the first magnetic layer,
the first magnetic layer including a first element including at least one of Fe, Co, or Ni,
the second magnetic layer including the first element, and a second element including at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc,
the first magnetic layer not including the second element, or a concentration of the second element in the first magnetic layer being lower than a concentration of the second element in the second magnetic layer, and
a first thickness of the first magnetic layer along a first direction from the first magnetic pole toward the second magnetic pole being not less than 0.25 times and not more than 4 times a second thickness of the second magnetic layer along the first direction,
wherein
the second magnetic layer includes a third magnetic region and a fourth magnetic region,
the fourth magnetic region is between the third magnetic region and the first non-magnetic layer, and
a concentration of Fe in the third magnetic region is higher than a concentration of Fe in the fourth magnetic region.
19. A magnetic recording head, comprising:
a first magnetic pole;
a second magnetic pole; and
a stacked body provided between the first magnetic pole and the second magnetic pole, and
a coil,
the stacked body including
a first magnetic layer,
a second magnetic layer provided between the first 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 second magnetic pole, and
a third non-magnetic layer provided between the first magnetic pole and the first magnetic layer,
the first magnetic layer including a first element including at least one of Fe, Co, or Ni,
the second magnetic layer including the first element, and a second element including at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc,
the first magnetic layer not including the second element, or a concentration of the second element in the first magnetic layer being lower than a concentration of the second element in the second magnetic layer, and
a first thickness of the first magnetic layer along a first direction from the first magnetic pole toward the second magnetic pole being not less than 0.25 times and not more than 4 times a second thickness of the second magnetic layer along the first direction,
a recording magnetic field generated from at least one of the first magnetic pole or the second magnetic pole changing according to a recording current flowing through the coil,
an electrical resistance of the stacked body being a first resistance when the recording current is a first current,
the electrical resistance being a second resistance when the recording current is a second current,
the electrical resistance being a third resistance when the recording current is a third current,
an absolute value of the first current being smaller than an absolute value of the second current, and being smaller than an absolute value of the third current,
a direction of the second current being opposite to a direction of the third current, and
the first resistance being lower than the second resistance, and being lower than the third resistance.
20. A magnetic recording device, comprising:
a magnetic recording head; and
an electric circuit;
wherein the magnetic recording head comprises:
a first magnetic pole;
a second magnetic pole; and
a stacked body provided between the first magnetic pole and the second magnetic pole,
the stacked body including
a first magnetic layer,
a second magnetic layer provided between the first 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 second magnetic pole, and
a third non-magnetic layer provided between the first magnetic pole and the first magnetic layer,
the first magnetic layer including a first element including at least one of Fe, Co, or Ni,
the second magnetic layer including the first element, and a second element including at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc,
the first magnetic layer not including the second element, or a concentration of the second element in the first magnetic layer being lower than a concentration of the second element in the second magnetic layer, and
a first thickness of the first magnetic layer along a first direction from the first magnetic pole toward the second magnetic pole being not less than 0.25 times and not more than 4 times a second thickness of the second magnetic layer along the first direction; and
the electric circuit configured to generate a current in the stacked body in a direction from the first magnetic layer toward the second magnetic layer.