Magnetic domain devices

• US 4,219,882 A
• Filed: 12/22/1978
• Issued: 08/26/1980
• Est. Priority Date: 12/29/1977
• Status: Expired due to Term

• Current Assignee: Radstone Technology Limited
• Original Assignee: Plessey Handel und Investments AG
• Inventors: Cooper, Paul V., Marsh, Anthony
• Primary Examiner(s): Moffitt, James W.
• Application Number:
  US05/972,361
• Time in Patent Office: 613 Days
• Field of Search: 365/2, 365/53
• US Class Current: 365/2
• CPC Class Codes: G11C 19/085 Generating magnetic fields therefor, e.g. uniform magnetic field for magnetic domain stabilisation

Abstract

A magnetic domain device has a pair of orthogonally disposed coils one inside the other with the device chip disposed in the center of both of the coils, and a flexible substrate to which the device chip is directly or indirectly attached, the flexible substrate being suitably shaped and folded so that it extends between the coils and enables external electrical connection to be made to the device chip.

Claims

1. A magnetic domain device having a pair of orthogonally disposed coils one inside the other with a device chip disposed in the centre of both of the coils and flexible substrate means to which the device chip is directly or indirectly attached, the flexible substrate means being suitably shaped and folded so that it extends between said coils and enables external electrical connection to be made to the device chip.

2. A magnetic domain device as claimed in claim 1 in which the flexible substrate means takes the form of a printed circuit board provided with an electrical conductor pattern to which the device chip is directly or indirectly electrically connected and to which when the flexible substate means is folded back between the said two coils and over the outer one of said two coils a lead frame is electrically connected.

3. A magnetic domain device as claimed in claim 2 in which the printed circuit board is of `L` shape.

4. A magnetic domain device as claimed in claim 2 or 3 in which the printed circuit board is formed form `Kapton`.

5. A magnetic domain device as claimed in claim 4 in which the printed circuit board is of single sided, or double sided, or multi-layer form to enable one or both sides of the electrical conductor pattern to be screened.

6. A magnetic domain device as claimed in claim 3 in which the printed circuit board is of single sided, or double sided, or multi-layer form to enable one or both sides of the electrical conductor pattern to be screened.

7. A magnetic domain device as claimed in claim 2 in which the printed circuit board is of single sided, or double sided, or multi-layer form to enable one or both sides of the electrical conductor pattern to be screened.