Dynamic magnetic information storage or retrieval – Head – Core
Reexamination Certificate
1998-10-01
2001-09-18
Klimowicz, William (Department: 2652)
Dynamic magnetic information storage or retrieval
Head
Core
C029S603140
Reexamination Certificate
active
06292329
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a single magnetic pole head used as a recording head in a perpendicular magnetic recording system. More particularly, it relates to a thin-film single magnetic pole head in which the main magnetic pole is formed by a soft magnetic thin film.
2. Description of the Related Art
In the field of magnetic recording, such as in a hard disc or a floppy disc, recording density is increasing drastically, such that 1 Gbit/square inch or even 10 Gbit/square inch is not unlikely to be reached.
In magnetic recording system, so-called longitudinal recording system (in-plane recording system) is customary, and a longitudinal recording medium is routinely used for recording/reproduction. If the recording density reaches the order of 10 Gbits/square inch, recording demagnetization poses a problem because the diamagnetic coefficient is increased in the case of the longitudinal recording medium.
Also, for high recording density, the recording frequency needs to be increased, such that, in a recording head, it is necessary to decrease the inductance in order to decrease the rise time of the writing current waveform. Although it is attempted to form the recording coil in two layers, such attempt occasionally leads to a complicated process.
Under these circumstances, attention is again directed to the perpendicular magnetic recording system, which can maintain stable magnetization despite high recording density.
In the perpendicular magnetic recording system, there is required a magnetic head capable of recording on a perpendicular magnetic recording medium. For example, in a single-layer perpendicular magnetic recording medium, writing is possible by a so-called ring head. However, with a double-layer perpendicular magnetic recording medium, having a high magnetic permeability layer below the magnetic layer, recording characteristics in a higher frequency are deteriorated because of recording demagnetization, although recording is possible with the ring head. Thus, there is raised a demand for a recording head exhibiting superior recording characteristics even in a high frequency range.
In order to meet the demand for improved recording density, high resolution is achieved by increasing coercivity and reducing the film thickness. In a recording head, there have been attempts to increase saturation density of a recording core and to increase frequency characteristics of magnetic permeability of a recording core material, in order to cope with increased coercivity of a recording medium, while attempting to establish a manufacturing method for a narrow track head and to provide a double-layer recording coil in order to cope with high track density and in order to reduce head inductance to cope with the high linear recording density.
Although there have been attempts to reduce the film thickness of the main magnetic pole in the magnetic head of the perpendicular magnetic recording system, it is necessary to energize the foremost part of the main magnetic pole with high efficiency.
Notwithstanding past efforts to improve the recording head in this line, there has not been found a practically satisfactory head structure.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a thin-layer single magnetic pole head which enables highly efficient energization of the main magnetic pole and which exhibits optimum recording characteristics even in case of high frequency recording on a double-layer perpendicular magnetic recording medium.
The present invention provides a thin-film single magnetic pole head including a main magnetic pole constituted by a soft magnetic thin film, and a return yoke, wherein the improvement resides in that a thin-film coil for energizing the main magnetic pole is constituted by a plurality of conductor layers extending substantially parallel to one another and substantially at right angles to the main magnetic pole. The conductor layers are layered together in the up-and-down direction on both sides of the main magnetic pole, and a thin-film coil for magnetically energizing the main magnetic pole is constituted by selectively interconnecting the conductors.
By arranging the thin-film coil by plural conductor layers layered above and below the main magnetic pole for extending substantially parallel to one another, the thin-film coil can be arranged in the vicinity of the distal end of the main magnetic pole (towards the perpendicular mem facing surface).
The result is that the distal end of the main magnetic pole can be efficiently energized by the magnetic field generated by this thin-film coil to realize superior recording characteristics even in case of recording to a high frequency on a double-layer perpendicular magnetic recording medium.
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Katakura Toru
Muraoka Hiroaki
Nakamura Yoshihisa
Sato Jin
Chen Tianjie
Klimowicz William
Sonnenschein Nath & Rosenthal
Sony Corporation
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