# US 4,686,151 A · Substrate material for magnetic recording media

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- Number: US 4,686,151 A
- Document ID: US4686151A
- Status: Granted
- Kind: A
- Application number: 06/721,310
- Filed: 1985-04-09
- Granted: 1987-08-11
- Earliest claimed: 1985-04-09
- Assignees: Dynamic Disk, Inc.
- Inventors: Daniel X. Wray
- Web page: https://patentgrep.com/patent/US4686151A

## CPC

- G11B 5/858: Producing a magnetic layer by electro-plating or electroless plating
- G11B 5/64: comprising only the magnetic material without bonding agent
- Y10S 428/928: Magnetic property
- Y10T 428/1275: Next to Group VIII or IB metal-base component
- 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)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An enhanced substrate for magnetic data storage devices incorporating a metallic thin film magnetic recording medium attached to the substrate by wet plating processes. In one embodiment the substrate is composed of a single phase alloy. The substrate can then be processed by conventional magnetic data storage device fabrication procedures with the resultant storage device having fewer surface coating irregularities and magnetic characteristic inconsistencies than conventional magnetic data storage devices. In an alternative embodiment a layer of a single phase alloy is first deposited onto a conventional substrate. The single phase alloy may be incorporated in both rigid storage devices where a magnetic data read-write head floats above the surface of the storage device or flexible magnetic storage devices in which the read-write head is in intimate contact with the storage device.

## Claims

### Claim 1

A magnetic data storage device comprising:
a substrate composed of a single phase metal; and
a metallic thin film magnetic data storage medium attached to said substrate by a wet plating process; wherein said substrate is a rigid disk composed of at least approximately 98% aluminum and not more than approximately 2% magnesium.

### Claim 2

A magnetic data storage device comprising:
a substrate composed of a single phase metal; and
a metallic thin film magnetic data storage medium attached to said substrate by a wet plating process; wherein said substrate is a rigid disk composed of between approximately 50-65% aluminum and between approximately 50-35% magnesium.

### Claim 3

A magnetic data storage device comprising:
a substrate composed of a single phase metal; and
a metallic thin film magnetic data storage medium attached to said substrate by a wet plating process; wherein said substrate is a rigid disk composed of approximately 2% aluminum and approximately 98% magnesium.

### Claim 4

A magnetic data storage device comprising:
a substrate composed of a single phase metal; and
a metallic thin film magnetic data storage medium attached to said substrate by a wet plating process; wherein said substrate is a rigid disk composed of approximately 98.7% aluminum and approximately 1.3% zinc.

### Claim 5

A magnetic data storage device comprising:
a substrate composed of a single phase metal; and
a metallic thin film magnetic data storage medium attached to said substrate by a wet plating process; wherein said substrate is a rigid disk composed of approximately 67% aluminum and approximately 33% copper.

### Claim 6

A magnetic data storage device comprising:
a substrate composed of a single phase metal; and
a metallic thin film magnetic data storage medium attached to said substrate by a wet plating process; wherein said substrate is a rigid disk composed of approximately 99.28% aluminum and approximately 0.72% chromium.

### Claim 7

A magnetic data storage device comprising:
a substrate composed of a single phase metal; and
a metallic thin film magnetic data storage medium attached to said substrate by a wet plating process; wherein said substrate is a rigid disk composed of at least approximately 98% aluminum and not more than approximately 2% magnesium.

### Claim 8

A magnetic data storage device comprising:
a substrate composed of a single phase metal; and
a metallic thin film magnetic data storage medium attached to said substrate by a wet plating process; wherein said substrate is a rigid disk composed of between approximately 50-65% aluminum and between approximately 50-35% magnesium.

### Claim 9

A magnetic data storage device comprising:
a substrate composed of a single phase metal; and
a metallic thin film magnetic data storage medium attached to said substrate by a wet plating process; wherein said substrate is a flexible foil composed of approximately 2% aluminum and approximately 98% magnesium.

### Claim 10

A magnetic data storage device comprising:
a substrate composed of a single phase metal; and
a metallic thin film magnetic data storage medium attached to said substrate by a wet plating process; wherein said substrate is a flexible foil composed of approximately 98.7% aluminum and approximately 1.3% zinc.

### Claim 11

A magnetic data storage device comprising:
a substrate composed of a single phase metal; and
a metallic thin film magnetic data storage medium attached to said substrate by a wet plating process; wherein said substrate is a flexible foil composed of approximately 67% aluminum and approxiamtely 33% copper.

### Claim 12

A magnetic data storage device comprising:
a substrate composed of a single phase metal; and
a metallic thin film magnetic data storage medium attached to said substrate by a wet plating process; wherein said substrate is a flexible foil composed of approximately 99.28% aluminum and approximately 0.72% chromium.

### Claim 13

A magnetic data storage device comprising:
a substrate;
a single phase metal film attached to said substrate; and
a metallic thin film magnetic data recording media deposited onto said single phase metal film; wherein said substrate is a rigid disk and said single phase metal film is composed of at least approximately 98% aluminum and not more than approximately 2% magnesium.

### Claim 14

A magnetic data storage device comprising:
a substrate;
a single phase metal film attached to said substrate; and
a metallic thin film magnetic data recording media deposited onto said single phase metal film; wherein said substrate is a rigid disk and said single phase metal is composed of approximately 50-65% aluminum and between approximately 50-35% magnesium.

### Claim 15

A magnetic data storage device comprising:
a substrate;
a single phase metal film attached to said substrate; and
a metallic thin film magnetic data recording media deposited onto said single phase metal film; wherein said substrate is a rigid disk and said single phase metal film is composed of approximately 2% aluminum and approximately 98% magnesium.

### Claim 16

A magnetic data storage device comprising:
A substrate;
a single phase metal film attached to said substrate; and
a metallic thin film magnetic data recording media deposited onto said single phase metal film; wherein said substrate is a rigid disk and said single phase metal film is composed of approximately 98.7% aluminum and approximately 1.3% zinc.

### Claim 17

A magnetic data storage device comprising:
a substrate;
a single phase metal film attached to said substrate; and
a metallic thin film magnetic data recording media deposited onto said single phase metal film; wherein said substrate is a rigid disk and said single phase metal film is composed of approximately 67% aluminum and approximately 33% copper.

### Claim 18

A magnetic data storage device comprising:
a substrate;
a single phase metal film attached to said substrate; and
a metallic thin film magnetic data recording media deposited onto said single phase metal film; wherein said substrate is a rigid disk and said single phase metal film is composed of approximately 99.28% aluminum and approximately 0.72% chromium.

### Claim 19

A magnetic data storage device comprising:
a substrate;
a single phase metal film attached to said substrate; and
a metallic thin film magnetic data recording media deposited onto said single phase metal film; wherein said substrate is a rigid disk and said single phase metal film is an alloy which does not include aluminum.

### Claim 20

A magnetic data storage device comprising:
a substrate;
a single phase metal film attached to said substrate; and
a metallic thin film magnetic data recording media deposited onto said single phase metal film; wherein said substrate is a flexible structure and said single phase metal film is composed of approximately 98% aluminum and not more than approximately 2% magnesium.

### Claim 21

A magnetic data storage device comprising:
a substrate;
a single phase metal film attached to said substrate; and
a metallic thin film magnetic data recording media deposited onto said single phase metal film; wherein said substrate is a flexible structure and said single phase metal film is composed of between approximately 50-65% aluminum and between approximately 50-35% magnesium.

### Claim 22

A magnetic data storage device comprising:
a substrate;
a single phase metal film attached to said substrate; and
a metallic thin film magnetic data recording media deposited onto said single phase metal film; wherein said substrate is a flexible structure and said single phase metal film is composed of approximately 2% aluminum and approximately 98% magnesium.

### Claim 23

A magnetic data storage device comprising:
a substrate;
a single phase metal film attached to said substrate; and
a metallic thin film magnetic data recording media deposited onto said single phase metal film; wherein said substrate is a flexible structure and said single phase metal film is composed of approximately 98.7% aluminum and approximately 1.3% zinc.

### Claim 24

A magnetic data storage device comprising:
a substrate;
a single phase metal film attached to said substrate; and
a metallic thin film magnetic data recording media deposited onto said single phase metal film; wherein said substrate is a flexible structure and said single phase metal film composed of approximately 67% aluminum and approximately 33% copper.

### Claim 25

A magnetic data storage device comprising:
a substrate;
a single phase metal film attached to said substrate; and
a metallic thin film magnetic data recording media deposited onto said single phase metal film; wherein said substrate is a flexible structure and said single phase metal film is composed of approximately 99.28% aluminum and approximately 0.72% chromium.