# US 5,703,733 A · Magetic recording/reproducing method, magnetic reproducing apparatus used therefor, magnetic recording medium and method for producing the same

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- Number: US 5,703,733 A
- Document ID: US5703733A
- Status: Granted
- Kind: A
- Application number: 08/506,871
- Filed: 1995-07-25
- Granted: 1997-12-30
- Earliest claimed: 1995-03-06
- Assignees: Mitsubishi Denki Kabushiki Kaisha
- Inventors: Shigehisa Suzuki; Tatsuya Fukami; Yoshio Fujii; Yuji Kawano; Yoshinobu Maeda
- Web page: https://patentgrep.com/patent/US5703733A

## CPC

- G11B 5/00: Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor (G11B11/00 {and G11B13/00} take precedence)
- B82Y 10/00: Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
- B82Y 25/00: Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
- G11B 5/012: Recording on, or reproducing or erasing from, magnetic disks (G11B17/00, G11B19/00 take precedence)
- G11B 5/37: using galvano-magnetic devices, e.g. Hall-effect devices (G11B5/39 takes precedence){using Hall or Hall-related effect, e.g. planar-Hall effect or pseudo-Hall effect}
- G11B 5/3903: {using magnetic thin film layers or their effects, the films being part of integrated structures}
- G11B 5/3961: {disposed at an angle to the direction of the track or relative movement}
- G11B 5/488: {Disposition of heads (G11B5/49, G11B5/52 take precedence)}
- G11B 5/4886: {relative to rotating disc}
- G11B 5/4976: {Disposition of heads, e.g. matrix arrangement}
- G11B 5/58: with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following {(spacing means incorporated in the head structure G11B5/187, G11B5/255, G11B5/3106)}
- G11B 5/596: for track following on disks {(G11B5/5526, G11B5/5552, G11B5/5565, G11B5/5582 take precedence)}
- G11B 5/59683: {for magnetoresistive heads}
- G11B 5/74: Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
- G11B 5/743: {Patterned record carriers, wherein the magnetic recording layer is patterned into magnetic isolated data islands, e.g. discrete tracks}
- G11B 5/82: Disk carriers
- G11B 5/86: Re-recording, i.e. transcribing information from one magnetisable record carrier on to one or more similar or dissimilar record carriers {(by varying the order of the information G11B27/029, G11B27/036)}
- G11B 5/035: Equalising
- G11B 5/3183: {intersecting the gap plane, e.g. "horizontal head structure"}
- G11B 5/4907: {Details for scanning (G11B5/4969 takes precedence)}
- G11B 5/5526: {Control therefor; circuits, track configurations or relative disposition of servo-information transducers and servo-information tracks for control thereof (G11B5/556 takes precedence)}
- G11B 5/59633: {Servo formatting (G11B5/59627, G11B5/59677, G11B5/59683, G11B5/59688 take precedence)}
- G11B 27/005: {Reproducing at a different information rate from the information rate of recording (for television signals H04N5/783)}
- G11B 2005/3996: {large or giant magnetoresistive effects [GMR], e.g. as generated in spin-valve [SV] devices}
- Y10S 977/934: Giant magnetoresistance, GMR
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A method for magnetically recording/reproducing comprising recording an information signal by forming a pattern of a soft magnetic material in a magnetic recording medium; providing a magnetoeletric converting element a place neighboring a face of forming the pattern of the magnetic recording medium on which the pattern formed; applying a magnetic field to the pattern; and reproducing the information by detecting a variation of the magnetic field caused by the pattern of the soft magnetic material of the magnetic recording medium while relatively moving the magnetoelectric converting element and the magnetic recording medium.

## Claims

### Claim 1

A method for magnetically recording/reproducing information, said method comprising the steps of:
recording an information signal by forming a pattern of a soft magnetic material in a magnetic recording medium proximate a first surface of a magnetic recording medium;
providing a magnetoelectric converting element at a position adjacent to and spaced away from said first surface;
applying a magnetic field to said magnetoelectric converting element; and
reproducing said information by detecting a variation of said magnetic field caused by a presence or absence of said soft magnetic material based on said pattern of said soft magnetic material while causing relative movement between said magnetoelectric converting element and said magnetic recording medium.

### Claim 2 (depends on 1)

The magnetic recording/reproducing method of claim 1, wherein there is provided:
a magnetic head comprising a magnetic circuit including a magnet and magnetic gap, and
a magnetoelectric converting element provided in said magnetic gap such that said magnetic gap of said magnetic head opposes said magnetic recording medium, and
wherein said reproducing step comprises detecting a variation of a magnetic flux in said magnetic gap caused by said pattern of said soft magnetic material approaching said magnetic gap during said relative movement.

### Claim 3 (depends on 1)

The magnetic recording/reproducing method of claim 1, wherein said information signal is reproduced by applying said magnetic field in a direction which is vertical with respect to said magnetic recording medium, and detecting a variation of the direction of the magnetic field passing through said magnetoelectric converting element caused when said pattern of said soft magnetic material approaches said magnetoelectric converting element during said relative movement.

### Claim 4 (depends on 1)

The magnetic recording/reproducing method of claim 1, wherein said magnetoelectric converting element includes a plurality of elements, said plurality of elements being provided such that said plurality of elements are arranged perpendicular to the direction of said track of said pattern thereby reproducing a plurality of information signals from a plurality of tracks simultaneously.

### Claim 5 (depends on 1)

The magnetic recording/reproducing method of claim 1, wherein said magnetoelectric converting element includes a plurality of elements, said plurality of elements being provided such that said plurality of elements are arranged perpendicular to the direction of a track of said pattern of said soft magnetic material, thereby performing a tracking servo operation by using at least one of said elements while reproducing an information signal.

### Claim 6 (depends on 1)

The magnetic recording/reproducing method of claim 1, wherein said magnetoelectric converting element is divided into two parts, and wherein a tracking servo operation is performed by comparing signals indicative of change of a magnetic field obtained from said two parts, while performing a tracking servo operation.

### Claim 7

A method for magnetically recording and reproducing information, said method comprising the steps of:
recording an information signal by forming a pattern of magnetically soft material in a magnetic recording medium at a first surface of a magnetic recording medium;
providing a magnetoelectric converting element proximate to and spaced away from said first surface;
applying a magnetic field to said magnetoelectric element; and
reproducing said information by causing relative noncontacting movement of said pattern and said magnetoelectric converting element and detecting a variation of said magnetic field caused by a presence or absence of said soft magnetic material in portions of said pattern as said portions sequentially come into proximity with said magnetoelectric element during said relative noncontacting movement.