Magnetic head and magnetic recording device
According to one embodiment, a magnetic head includes first and second magnetic poles, and a stacked body provided between the first and second magnetic poles. 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 nonmagnetic layer provided between the first and second magnetic layers, a second nonmagnetic layer provided between the second magnetic layer and the second magnetic pole, and a third nonmagnetic 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 (Fe 100-x Co x ) 100-y E y . A second element E includes at least one selected from the group consisting of Cr, V, Mn, Yi, and Sc. The first magnetic layer does not include the second element.
1. A magnetic head, comprising:
a first magnetic pole;
a second magnetic pole;
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 nonmagnetic layer provided between the first magnetic layer and the second magnetic layer,
a second nonmagnetic layer provided between the second magnetic layer and the second magnetic pole, and
a third nonmagnetic 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 (Fe 100-x Co x ) 100-y E y (10 atomic %≤x≤50 atomic %, 10 atomic %≤y≤90 atomic %), a second element E 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 less than a concentration of the second element in the second magnetic layer,
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 less than an absolute value of the second current, and being less than an absolute value of the third current,
an orientation of the second current being opposite to an orientation of the third current, and
the first resistance being less than the second resistance, and being less than the third resistance.
2. The head according to claim 1 , wherein the composition ratio x is not less than 25 atomic % and not more than 35 atomic %.
3. The head according to claim 2 , wherein the composition ratio y is not less than 10 atomic % and not more than 30 atomic %.
4. The head according to claim 1 , wherein 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.
5. The head according to claim 4 , wherein the first thickness is not less Char 0.33 times the second thickness.
6. The head according to claim 4 , wherein the third nonmagnetic layer contacts the first magnetic pole and the first magnetic layer.
7. The head according to claim 4 , wherein the second nonmagnetic layer contacts the second magnetic layer and the second magnetic pole.
8. The head according to claim 4 , wherein a sum of the first thickness and the second thickness is not less than 15 nm.
9. 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 nonmagnetic 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 less than a concentration of the second element in the second magnetic layer.
10. A magnetic recording device, comprising:
the head according to claim 1 ; and
an electrical circuit,
the electrical circuit being configured to supply a current to the stacked body, and
the current having an orientation from the first magnetic layer toward the second magnetic layer.
11. A magnetic recording device, comprising:
the head according to claim 1 ; and
a magnetic recording medium,
information being recorded in the magnetic recording medium by the head.
12. A magnetic recording device, comprising:
the head according to claim 1 ; and
an electrical circuit,
the electrical circuit being configured to supply an element current to the stacked body, and to supply the recording current to the coil,
the element current having an orientation from the first magnetic layer toward the second magnetic layer.