Magnetic head and a magnetic disk drive
View Patent ↗The CPP structure magnetoresistive head has a structure such that a first lead line is electrically connected to a lead contact portion attached to a lower shield layer the width of which is either equal to or shorter than the maximum length of the lower shield layer in the track direction, or the height of which is either equal to or shorter than the maximum length of the lower shield layer in the stripe height direction. With the structures above, it is possible to prevent that a bump is generated on the upper shield layer by the first lead line, and that a magnetic domain is formed by the bump, which is a cause of noise generation. Further, it is possible to avoid overlapping between the lead line and the upper shield layer.
1. A magnetic head, comprising:
an upper shield layer;
a lower shield layer on which a lead contact portion is provided on the edge of the lower shield layer in a stripe height direction within a same plane, the lead contact portion having a width either being equal to or shorter than a maximum length of the lower shield layer in a track width direction;
a magnetoresistive sensor which is formed between the upper shield layer and the lower shield layer;
a first lead line which is electrically connected to the lead contact portion of the lower shield layer; and
a second lead line which is electrically connected to the upper shield layer, wherein
when the upper shield layer is projected on a plane where the lower shield layer exists, the lead contact portion of the lower shield layer is provided in a position not overlapped by the upper shield layer, and sense current flows through the upper shield layer, the magnetoresistive sensor and the lower shield layer.
2. A magnetic head, comprising:
an upper shield layer;
a lower shield layer on which a lead contact portion is provided on the edge of the lower shield layer in a track width direction within a same plane, the lead contact portion having a height either being equal to or shorter than a maximum height of the lower shield layer in a stripe height direction;
a magnetoresistive sensor which is formed between the upper shield layer and the lower shield layer;
a first lead line which is electrically connected to the lead contact portion of the lower shield layer; and
a second lead line which is electrically connected to the upper shield layer, wherein
when the upper shield layer is projected on a plane where the lower shield layer exists, the lead contact portion of the lower shield layer is provided in a position not overlapped by the upper shield layer, and sense current flows through the upper shield layer, the magnetoresistive sensor and the lower shield layer.
3. A magnetic head, comprising:
an upper shield layer;
a lower shield layer;
a magnetoresistive sensor formed between the upper shield layer and the lower shield layer;
a first lead line electrically connected to the lower shield layer;
a second lead line electrically connected to the upper shield layer, and a sense current flows through the upper shield layer, the magnetoresistive sensor and the lower shield layer, wherein
the lower shield layer has a lower lead contact portion within a same plane, the lower lead contact portion is positioned so as not to be overlapped by the upper shield layer, when the upper shield layer is projected on the plane where the lower shield layer exists, and the first lead line is connected to the lower lead contact portion.
4. A magnetic head according to claim 3 , wherein
the lower lead contact portion is formed in approximately convex shape on an opposite side of an air bearing surface in the stripe height direction on the lower shield layer.
5. A magnetic head according to claim 4 , wherein
the upper shield layer has an upper lead contact portion of approximately convex shape within a same plane.
6. A magnetic head according to claim 5 , wherein
the upper lead contact portion is formed on an opposite side of the air bearing surface in the stripe height direction on the upper shield layer.
7. A magnetic head according to claim 5 , wherein
the upper lead contact portion is formed on at least one edge in the track width direction on the upper shield layer.
8. A magnetic head according to claim 3 , wherein
the lower lead contact portion is formed in approximately convex shape on at least one edge in the track width direction on the lower shield layer.
9. A magnetic head according to claim 8 , wherein
the upper shield layer has an upper lead contact portion of approximately convex shape within a same plane.
10. A magnetic head according to claim 9 , wherein
the upper lead contact portion is formed on an opposite side of an air bearing surface in the stripe height direction on the upper shield layer.
11. A magnetic head according to claim 9 , wherein
the upper lead contact portion is formed on at least one edge in the track width direction on the upper shield layer.
12. A magnetic head according to claim 3 , further comprising
a write head having a main pole and a return pole.
13. A magnetic disk drive, comprising:
a read/write head having a recording head for recording information on a magnetic disk and a reading head for detecting the information recorded on the magnetic disk;
a read/write circuit for sending and receiving a recording signal and a reproducing signal from or to the read/write head;
an actuator means which moves the read/write head to a predetermined position on the magnetic disk; and
a read/write operation control means for controlling the read/write circuit and the actuator means, wherein the read/write head includes a magnetic head comprising:
an upper shield layer;
a lower shield layer on which a lead contact portion is provided on the edge of the lower shield layer in a stripe height direction within a same plane, the lead contact portion having a width either being equal to or shorter than a maximum length of the lower shield layer in a track width direction;
a magnetoresistive sensor which is formed between the upper shield layer and the lower shield layer;
a first lead line which is electrically connected to the lead contact portion of the lower shield layer; and
a second lead line which is electrically connected to the upper shield layer, wherein
when the upper shield layer is projected on a plane where the lower shield layer exists, the lead contact portion of the lower shield layer is provided in a position not overlapped by the upper shield layer, and sense current flows through the upper shield layer, the magnetoresistive sensor and the lower shield layer.
14. A magnetic disk drive, comprising:
a read/write head having a recording head for recording information on a magnetic disk and a reading head for detecting the information recorded on the magnetic disk;
a read/write circuit for sending and receiving a recording signal and a reproducing signal from or to the read/write head;
an actuator means which moves the read/write head to a predetermined position on the magnetic disk; and
a read/write operation control means for controlling the read/write circuit and the actuator means, wherein the read/write head includes a magnetic head comprising:
an upper shield layer;
a lower shield layer on which a lead contact portion is provided on the edge of the lower shield layer in a track width direction within a same plane, the lead contact portion having a height either being equal to or shorter than a maximum height of the lower shield layer in a stripe height direction;
a magnetoresistive sensor which is formed between the upper shield layer and the lower shield layer;
a first lead line which is electrically connected to the lead contact portion of the lower shield layer; and
a second lead line which is electrically connected to the upper shield layer, wherein
when the upper shield layer is projected on a plane where the lower shield layer exists, the lead contact portion of the lower shield layer is provided in a position not overlapped by the upper shield layer, and sense current flows through the upper shield layer, the magnetoresistive sensor and the lower shield layer.
15. A magnetic disk drive, comprising:
a read/write head having a recording head for recording information on a magnetic disk and a reading head for detecting the information recorded on the magnetic disk;
a read/write circuit for sending and receiving a recording signal and a reproducing signal from or to the read/write head;
an actuator means which moves the read/write head to a predetermined position on the magnetic disk; and
a read/write operation control means for controlling the read/write circuit and the actuator means, wherein the read/write head includes a magnetic head comprising:
an upper shield layer;
a lower shield layer;
a magnetoresistive sensor formed between the upper shield layer and the lower shield layer;
a first lead line electrically connected to the lower shield layer;
a second lead line electrically connected to the upper shield layer, and a sense current flows through the upper shield layer, the magnetoresistive sensor and the lower shield layer, wherein
the lower shield layer has a lower lead contact portion within a same plane, the lower lead contact portion is positioned so as not to be overlapped by the upper shield layer, when the upper shield layer is projected on the plane where the lower shield layer exists, and the first lead line is connected to the lower lead contact portion.
16. A magnetic disk drive according to claim 15 , wherein
the lower lead contact portion is formed in approximately convex shape on an opposite side of an air bearing surface in the stripe height direction on the lower shield layer.
17. A magnetic disk drive according to claim 16 , wherein
the upper shield layer has an upper lead contact portion of approximately convex shape within a same plane.
18. A magnetic disk drive according to claim 17 , wherein
the upper lead contact portion is formed on an opposite side of the air bearing surface in the stripe height direction on the upper shield layer.
19. A magnetic disk drive according to claim 17 , wherein
the upper lead contact portion is formed on at least one edge in the track width direction on the upper shield layer.
20. A magnetic disk drive according to claim 15 , wherein
the lower lead contact portion is formed in approximately convex shape on at least one edge in the track width direction on the lower shield layer.
21. A magnetic disk drive according to claim 20 , wherein
the upper shield layer has an upper lead contact portion of approximately convex shape within a same plane.
22. A magnetic disk drive according to claim 21 , wherein
the upper lead contact portion is formed on an opposite side of an air bearing surface in the stripe height direction on the upper shield layer.
23. A magnetic disk drive according to claim 21 , wherein
the upper lead contact portion is formed on at least one edge in the track width direction on the upper shield layer.