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US 6,724,570 B2Granted
Thin film magnetic head and method of manufacturing the same
AssigneeTDK Corporation
InventorsMakoto Yoshida, Taro Oike, Atsushi Iijima
Life of this patent
Estimating the term…
Abstract
A thin film magnetic head having excellent recording characteristics is provided. In a structure of the thin film magnetic head, a thickness LT (μm) of a top pole chip and a distance LD (μm) between a position of a front edge surface of a top yoke and a position of an air bearing surface are adapted to satisfy LD≧LT−2.0 (μm) (LD≧0, LT<0). In the thin film magnetic head having such structural features, the above-mentioned thickness LT and distance LD having an influence upon recording characteristics are optimized, and thus the occurrence of side erase during recording can be prevented.
Claims40
A thin film magnetic head including:
- two magnetic layers magnetically coupled to each other and having two magnetic poles which face each other with a gap layer in between near and in a recording-medium-facing surface to be faced with a recording medium, a thin film coil provided between the two magnetic layers, and an insulating layer for insulating the thin film coil from one of the two magnetic layers having a first magnetic layer portion and a second magnetic layer portion, the first magnetic layer portion having a uniform-width portion extending away from a recording-medium-facing surface facing a recording medium and defining a write track width on the recording medium, and the second magnetic layer portion coating a region in which the thin film coil is provided and partly overlapping and magnetically coupled to a part of the first magnetic layer portion,
- wherein a distance LD (μm) between a position of an edge of the second magnetic layer portion closest to the recording-medium-facing surface and a position of the recording-medium-facing surface and a thickness LT (μm) of a portion of the first magnetic layer portion exposed to the recording-medium-facing surface satisfy LD≧LT.
A method of manufacturing a thin film magnetic head including:
- two magnetic layers magnetically coupled to each other and having two magnetic poles which face each other with a gap layer in between near and in a recording-medium-facing surface to be faced with a recording medium, a thin film coil provided between the two magnetic layers, and an insulating layer for insulating the thin film coil from one of the two magnetic layers having a first magnetic layer portion and a second magnetic layer portion, the first magnetic layer portion having a uniform-width portion extending away from a recording-medium-facing surface facing a recording medium and defining a write track width on the recording medium, and the second magnetic layer portion coating a region in which the thin film coil is provided and partly overlapping and magnetically coupled to a part of the first magnetic layer portion,
- wherein the first magnetic layer portion and the second magnetic layer portion are formed so that a distance LD (μm) between a position of an edge of the second magnetic layer portion closest to the recording-medium-facing surface and a position of the recording-medium-facing surface and a thickness LT (μm) of a portion of the first magnetic layer portion exposed to the recording-medium-facing surface satisfy LD≧LT.
A thin film magnetic head including:
- two magnetic layers magnetically coupled to each other and having two magnetic poles which face each other with a gap layer in between near and in a recording-medium-facing surface to be faced with a recording medium, a thin film coil provided between the two magnetic layers and having at least one layer of thin film coil portion, and an insulating layer for insulating the thin film coil from one of the two magnetic layers having a first magnetic layer portion and a second magnetic layer portion, the first magnetic layer portion having a uniform-width portion extending away from a recording-medium-facing surface facing a recording medium and defining a write track width on the recording medium, the second magnetic layer portion coating a region in which the thin film coil is provided and partly overlapping and magnetically coupled to a part of the first magnetic layer portion, a lowest layer of the thin film coil portion being provided in an area corresponding to a thickness of the first magnetic layer portion, an area of the gap layer that excludes a portion corresponding to the uniform-width portion being selectively removed, and an area of the other magnetic layer that excludes a portion corresponding to the uniform-width portion being selectively recessed to a predetermined depth,
- wherein a distance LD (μm) between a position of an edge of the second magnetic layer portion closest to the recording-medium-facing surface and a position of the recording-medium-facing surface and a thickness LT (μm) of a portion of the first magnetic layer portion exposed to the recording-medium-facing surface satisfy LD≧LT−2.0 (μm).
A thin film magnetic head including:
- two magnetic layers magnetically coupled to each other and having two magnetic poles which face each other with a gap layer in between near and in a recording-medium-facing surface to be faced with a recording medium, a thin film coil provided between the two magnetic layers and having at least one layer of thin film coil portion and an insulating layer for insulating the thin film coil from one of the two magnetic layers having a first magnetic layer portion and a second magnetic layer portion, the first magnetic layer portion having a uniform-width portion extending away from a recording-medium-facing surface facing a recording medium and defining a write track width on the recording medium, the second magnetic layer portion coating a region in which the thin film coil is provided and partly overlapping and magnetically coupled to a part of the first magnetic layer portion, an area of the gap layer that excludes a portion corresponding to the uniform-width portion being selectively removed, an area of the other magnetic layer that excludes a portion corresponding to the uniform-width portion being selectively recessed to a predetermined depth, the insulating layer including an insulating layer portion in which a lowest layer of thin film coil portion is buried, the first magnetic layer portion being buried with the insulating layer portion and constituting a plane with the insulating layer portion, and the second magnetic layer portion being provided on the plane,
- wherein a distance LD (μm) between a position of an edge of the second magnetic layer portion closest to the recording-medium-facing surface and a position of the recording-medium-facing surface and a thickness LT (μm) of a portion of the first magnetic layer portion exposed to the recording-medium-facing surface satisfy LD≧LT−2.0 (μm).
A method of manufacturing a thin film magnetic head including:
- two magnetic layers magnetically coupled to each other and having two magnetic poles which face each other with a gap layer in between near and in a recording-medium-facing surface to be faced with a recording medium, a thin film coil provided between the two magnetic layers and having at least one layer of thin film coil portion, and an insulating layer for insulating the thin film coil from one of the two magnetic layers having a first magnetic layer portion and a second magnetic layer portion, the first magnetic layer portion having a uniform-width portion extending away from a recording-medium-facing surface facing a recording medium and defining a write track width on the recording medium, the second magnetic layer portion coating a region in which the thin film coil is provided and partly overlapping and magnetically coupled to a part of the first magnetic layer portion, a lowest layer of thin film coil portion being provided in an area corresponding to a thickness of the first magnetic layer portion, an area of the gap layer that excludes a portion corresponding to the uniform-width portion being selectively removed, and an area of the other magnetic layer that excludes a portion corresponding to the uniform-width portion being selectively recessed to a predetermined depth,
- wherein the first magnetic layer portion and the second magnetic layer portion are formed so that a distance LD (μm) between a position of an edge of the second magnetic layer portion closest to the recording-medium-facing surface and a position of the recording-medium-facing surface and a thickness LT (μm) of a portion of the first magnetic layer portion exposed to the recording-medium-facing surface satisfy LD≧LT−2.0 (μm).
A method of manufacturing a thin film magnetic head including:
- two magnetic layers magnetically coupled to each other and having two magnetic poles which face each other with a gap layer in between near and in a recording-medium-facing surface to be faced with a recording medium, a thin film coil provided between the two magnetic layers and having at least one layer of thin film coil portion, and an insulating layer for insulating the thin film coil from one of the two magnetic layers having a first magnetic layer portion and a second magnetic layer portion, the first magnetic layer portion having a uniform-width portion extending away from a recording-medium-facing surface facing a recording medium and defining a write track width on the recording medium, the second magnetic layer portion coating a region in which the thin film coil is provided and partly overlapping and magnetically coupled to a part of the first magnetic layer portion, an area of the gap layer that excludes a portion corresponding to the uniform-width portion being selectively removed, an area of the other magnetic layer that excludes a portion corresponding to the uniform-width portion being selectively recessed to a predetermined depth, the insulating layer including an insulating layer portion in which a lowest layer of thin film coil portion is buried, the first magnetic layer portion being buried with the insulating layer portion and constituting a plane with the insulating layer portion, and the second magnetic layer portion being provided on the plane,
- wherein the first magnetic layer portion and the second magnetic layer portion are formed so that a distance LD (μm) between a position of an edge of the second magnetic layer portion closest to the recording-medium-facing surface and a position of the recording-medium-facing surface and a thickness LT (μm) of a portion of the first magnetic layer portion exposed to the recording-medium-facing surface satisfy LD≧LT−2.0 (μm).
Dependencies are inferred from the claim text.