Magnetic head with multilayer configuration between magnetic poles and magnetic recording device
According to one embodiment, a magnetic head includes first and second magnetic poles, a conductive part, an element part, and first to fourth terminals. The conductive part is electrically insulated from the first and second magnetic poles. The first and second terminals are electrically connected to the conductive part. The element part is provided between the first and second magnetic poles and electrically connected to the first and second magnetic poles. The element part is conductive. The third terminal is electrically connected to the first magnetic pole. The fourth terminal is electrically connected to the second magnetic pole. A first magnetic pole temperature in a first state is higher than a second magnetic pole temperature of the second magnetic pole in the first state. A first current is supplied between the first and second terminals in the first state.
1. 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 magnetic pole temperature of the first magnetic pole in a first state being higher than a second magnetic pole temperature 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,
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, and
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.
2. The head according to claim 1 , wherein
in the first state, a current is not supplied between the third terminal and the fourth terminal.
3. The head according to claim 2 , wherein
in a first operation, the first current is supplied between the first terminal and the second terminal, and
in the first operation, an element current is supplied between the third terminal and the fourth terminal.
4. The head according to claim 3 , wherein
an orientation of the element current is an orientation from the fourth terminal to the third terminal.
5. The head according to claim 3 , wherein
in the first operation, a magnetic field corresponding to the first current is generated from the first magnetic pole.
6. The head according to claim 5 , wherein
an orientation of the magnetic field is configured to change according to an orientation of the first current.
7. The head according to claim 3 , wherein
in the first operation, information corresponding to an orientation of the first current is recorded on a magnetic recording medium.
8. The head according to claim 7 , wherein
the first magnetic pole includes a first magnetic pole face facing the magnetic recording medium,
the second magnetic pole includes a second magnetic pole face facing the magnetic recording medium, and
the first magnetic pole face is smaller than the second magnetic pole face.
9. A magnetic recording device, comprising:
the magnetic head according to claim 3 ;
a first circuit configured to supply the first current; and
a second circuit configured to supply the element current.
10. The head according to claim 1 , wherein
in the first state, a first potential of the first magnetic pole is higher than a second potential of the second magnetic pole.
11. The head according to claim 1 , wherein
the second magnetic pole further includes a first region,
the element part includes a first region element, and
the first region element is provided between the first magnetic pole and the first region.
12. The head according to claim 11 , wherein
the second magnetic pole further includes a second region,
the first magnetic pole is between the second region and the first region,
the element part further includes a second region element, and
the second region element is provided between the second region and the first magnetic pole.
13. The head according to claim 11 , wherein
the second magnetic pole further includes a third region,
a second direction from the third region to the first magnetic pole crosses a first direction from the first magnetic pole to the first region,
the element part further includes a third region element, and
the third region element is provided between the third region and the first magnetic pole.
14. The head according to claim 13 , wherein
the second magnetic pole further includes a fourth region,
the first magnetic pole is between the third region and the fourth region in the second direction,
the element part further includes a fourth region element, and
the fourth region element is provided between the first magnetic pole and the fourth region.
15. The head according to claim 1 , wherein
the second non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag.
16. The head according to claim 1 , wherein
the first non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag.
17. The head according to claim 16 , wherein
the first stacked body further includes
a fourth magnetic layer provided between the third non-magnetic layer and the second magnetic pole, and
a fourth non-magnetic layer provided between the fourth magnetic layer and the second magnetic pole.
18. 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.
19. The head according to claim 18 , wherein
the second non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag.
20. The head according to claim 18 , wherein
the first non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag.
21. The head according to claim 20 , wherein
the first stacked body further includes
a fourth magnetic layer provided between the third non-magnetic layer and the second magnetic pole, and
a fourth non-magnetic layer provided between the fourth magnetic layer and the second magnetic pole.