Perpendicular magnetic recording head and method for manufacturing the same
View Patent ↗Embodiments of the present invention help to provide a perpendicular magnetic recording head capable of writing a signal in a track having a small width. According to one embodiment, a perpendicular magnetic recording head includes an auxiliary pole, a main pole, a yoke, a coil, a first soft magnetic film and a second soft magnetic film. The yoke is in contact with the main pole. The coil is wound around a magnetic circuit composed of the auxiliary and main poles and the yoke. The first soft magnetic film is provided on both sides of the main pole with a non-magnetic film provided between the first soft magnetic film and the main pole. The second soft magnetic film is provided on the trailing side of the main pole with the non-magnetic film provided between the second soft magnetic film and the main pole. The first and second soft magnetic films are two types of plated magnetic films. One type of the plated magnetic films have respective thicknesses of 0.5 nm to 20 nm and respective body centered cubic lattice crystal structures. The other types of the plated magnetic films have respective thicknesses of 0.5 nm to 20 nm and respective face centered cubic lattice crystal structures. The two types of the plated magnetic films are alternately laminated with four or more layers. This can achieve the magnetic disk drive capable of reducing a possibility to erroneously delete a signal after the signal being written and preventing degradation of characteristics of a high frequency signal.
1. A perpendicular magnetic recording head comprising:
an auxiliary pole;
a main pole;
a yoke provided in contact with the main pole;
a coil wound around a magnetic circuit composed of the auxiliary pole, the main pole and the yoke;
a first soft magnetic film provided on both sides of the main pole with a non-magnetic film provided between the first soft magnetic film and the main pole; and
a second soft magnetic film provided on a trailing side of the main pole with the non-magnetic film provided between the second soft magnetic film and the main pole, wherein
the first and second soft magnetic films are two types of plated magnetic films, one type of the plated magnetic films having respective thicknesses of 0.5 nm to 20 nm and respective body centered cubic lattice crystal structures, the other type of the plated magnetic films having respective thicknesses of 0.5 nm to 20 nm and respective face centered cubic lattice crystal structures, and the two types of plated magnetic films being alternately laminated with four or more layers.
2. The perpendicular magnetic recording head according to claim 1 , wherein,
each of the plated magnetic films constituting the first and second soft magnetic films contains Ni and Fe, and
the weight percent of Ni contained in the entire plated magnetic films is in a range of 1.5 to 60, and the weight percent of Fe contained in the entire plated magnetic films is in a range of 40 to 85.
3. The perpendicular magnetic recording head according to claim 2 , wherein
the weight percent of Ni contained in each of the plated magnetic films having respective body centered cubic lattice crystal structures is in a range of 10 to 30, and the weight percent of Ni contained in each of the plated magnetic films having respective face centered cubic lattice crystal structures is in a range of 55 to 90.
4. The perpendicular magnetic recording head according to claim 1 , wherein
the yoke includes two types of plated magnetic films, one type of the plated magnetic films having respective thicknesses of 0.5 nm to 20 nm and respective body centered cubic lattice crystal structures, the other type of the plated magnetic films having respective thicknesses of 0.5 nm to 20 nm and respective face centered cubic lattice crystal structures, and the two types of plated magnetic films being alternately laminated with four or more layers.
5. The perpendicular magnetic recording head according to claim 4 , wherein
each of the plated magnetic films constituting the yoke contains Ni and Fe, and the weight percent of Ni contained in the entire plated magnetic films is in a range of 15 to 60, and the weight percent of Fe contained in the entire plated magnetic films is in a range of 40 to 85.
6. The perpendicular magnetic recording head according to claim 5 , wherein
the weight percent of Ni contained in each of the plated magnetic films having respective body centered cubic lattice crystal structures is in a range of 10 to 30, and the weight percent of Ni contained in each of the plated magnetic films having respective face centered cubic lattice crystal structures is in a range of 55 to 90.
7. The perpendicular magnetic recording head according to claim further comprising a read head including:
a lower magnetic shield film;
an upper magnetic shield film; and
a read element provided between the upper and lower magnetic shield films.
8. A perpendicular magnetic recording head comprising:
an auxiliary pole;
a main pole;
a yoke provided in contact with the main pole; and
a coil wound around a magnetic circuit composed of the auxiliary pole, the ma pole and the yoke, wherein
the yoke includes two types of plated magnetic films, one type of the plated magnetic films having respective thicknesses of 0.5 nm to 20 nm and respective body centered cubic lattice crystal structures, the other type of the plated magnetic films having respective thicknesses of 0.5 nm to 20 nm and respective face centered cubic lattice crystal structures, and the two types of plated magnetic films being alternately laminated with four or more layers.
9. The perpendicular magnetic recording head according to claim 8 , wherein
each of the plated magnetic films constituting the yoke contains Ni and Fe, and
the weight percent of Ni contained in the entire plated magnetic films is in a range of 15 to 60, and the weight percent of Fe contained in the entire plated magnetic films is in a range of 40 to 85.
10. The perpendicular magnetic recording head according to claim 9 , wherein,
the weight percent of Ni contained in each of the plated magnetic films having respective body centered cubic lattice crystal structures is in a range of 10 to 30, and the weight percent of Ni contained in each of the plated magnetic films having respective face centered cubic lattice crystal structures is in a range of 55 to 90.
11. The perpendicular magnetic recording head according to claim 8 , further comprising a read head including:
a lower magnetic shield film;
an upper magnetic shield film; and
a read element provided between the upper and lower magnetic shield films.
12. A method for manufacturing a perpendicular magnetic recording head, comprising the steps:
forming an auxiliary pole;
forming a coil above the auxiliary pole;
forming a yoke, which is magnetically connected with the auxiliary pole, above the coil on the opposite side of a floating surface of the perpendicular magnetic recording head;
forming a main pole, which is magnetically connected with the yoke, on the side of the floating surface;
forming a first soft magnetic film on both sides of the main pole with a non-magnetic film provided between the first soft magnetic film and the main pole; and
forming a second soft magnetic film on a trailing side of the main pole with the non-magnetic film provided between the second soft magnetic film and the main pole, wherein
the steps of forming the first and second soft magnetic films includes the step of forming two types of plated magnetic films, one type of the plated magnetic films having respective thicknesses of 0.5 nm to 20 nm and respective body centered cubic lattice crystal structures, the other type of the plated magnetic films having respective thicknesses of 0.5 nm to 20 nm and respective face centered cubic lattice crystal structures, and the two types of plated magnetic films being alternately laminated with four or more layers,
wherein the perpendicular magnetic recording head comprises;
the auxiliary pole;
the main pole;
the yoke in contact with the main pole;
the coil wound around a magnetic circuit composed of the auxiliary pole, the main pole and the yoke;
the first soft magnetic film on both sides of the main pole with the non-magnetic film between the first soft magnetic film and the main pole; and
the second soft magnetic film on the trailing side of the main pole with the non-magnetic film between the second soft magnetic film and the main pole, wherein the first and second soft magnetic films are the two types of plated magnetic films, were the one type of the plated magnetic films has respective thicknesses of 0.5 nm to 20 nm and respective body centered cubic lattice crystal structures, and where the other type of the plated magnetic films has respective thicknesses of 0.5 nm to 20 nm and respective face centered cubic lattice crystal structures, and the two types of plated magnetic films are alternately laminated with four or more layers.
13. The method according to claim 12 , wherein
each of the plated magnetic films constituting the first and second soft magnetic films contains Ni and Fe, and
the weight percent of Ni contained in the entire plated magnetic films is in a range of 15 to 60, and a weight percent of Fe contained in the entire plated magnetic films is in a range of 40 to 85.
14. The method according to claim 13 , wherein
the weight percent of Ni contained in each of the plated magnetic films having respective body centered cubic lattice crystal structures is in a range of 10 to 30, and the weight percent of Ni contained in each of the plated magnetic films having respective face centered cubic lattice crystal structures is in a range of 55 to 90.
15. The method according to claim 12 , wherein
the step of forming the yoke includes the step of forming the two types of plated magnetic films, one type of the plated magnetic films having respective thicknesses of 0.5 nm to 20 nm and respective body centered cubic lattice crystal structures, the other type of the plated magnetic films having respective thicknesses of 0.5 nm to 20 nm and respective face centered cubic, lattice crystal structures, and the two types of plated magnetic films being alternately laminated with four or more layers.
16. The method according to claim 15 , wherein
each of the plated magnetic films constituting the yoke contains Ni and Fe, and
the weight percent of Ni contained in the entire plated magnetic films is in a range of 15 to 60, and the weight percent of Fe contained in the entire plated magnetic films is in a range of 40 to 85.
17. The method according, to claim 16 , wherein
the weight percent of Ni contained in each of the plated magnetic films having respective body centered cubic lattice crystal structures is in a range of 10 to 30, and the weight percent of Ni contained in each of the plated magnetic films having respective face centered cubic lattice crystal structures is in a range of 55 to 90.
18. The method according to claim 12 , further comprising, the step of forming a read head before the step of forming the auxiliary pole.