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US 4,157,591 AGranted
Magnetic domain device
AssigneeU.S. Philips Corporation
InventorsEvert H. L. J. Dekker, Willem F. Druyvesteyn, Franciscus A. Kuijpers, Antonius G. H. Verhulst
Life of this patent
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Abstract
A magnetic bubble domain memory system having a first bubble domain path composed of Permalloy pattern elements, and a second bubble domain path composed of a current conductor is disclosed. Separate drives are associated with each of the paths, so the advantages of both types of domain propagation can be combined on a single memory chip. The first and second paths are interconnected, so transfer of domains between paths is possible.
Claims14
A magnetic bubble domain memory system comprising:
- a plate of magnetic material capable of supporting magnetic bubble domains, including a first path for storing and propagating magnetic bubble domains, comprising a plurality of spaced apart magnetically operative discrete elements, and a second path for storing and transporting magnetic bubble domains comprising at least one current conductor having a spatially periodic disposition, and having terminals connected thereto;
- interconnection means disposed between said first and second path for replicating magnetic bubble domains from a predetermined point on said first path to a predetermined point on said second path;
- means coupled to said plate for generating magnetic bubble domains;
- control means on said plate including first and second control outputs and having a first state for controlling the movement of magnetic bubble domains on said first and second paths at an identical frequency and a second state for independently controlling the movement of magnetic bubble domains on said second path at a higher frequency than on said first path;
- drive means for driving said magnetic bubble domains along said paths, comprising first drive means connected to said first control output, including a magnetic field generator for generating a rotary magnetic field which rotates in the plane of said plate with a predetermined first frequency for driving said magnetic bubble domains along said first path, and second drive means connected to said second control output including a current generator and having current outputs for generating a periodically varying electric current with a predetermined second frequency higher than said first frequency for independently driving said magnetic bubble domains along said second path, said terminals on said second path being connected to said current outputs;
- and
- detection means coupled to said plate for detecting the presence of magnetic bubble domains in a specific region of said plate.
4 more elements
A magnetic bubble domain memory comprising:
- a plate of magnetic material capable of supporting magnetic bubble domains, including a first path for storing and transporting magnetic bubble domains, said first path having a plurality of spaced apart magnetically operative discrete elements, and a second path for storing and transporting magnetic bubble domains having at least one current conductor having a spatially periodic structure, and having terminals connected thereto;
- interconnection means disposed between said first path and said second path for replicating the information content of a magnetic bubble on said first path onto a single magnetic bubble on said second path;
- control means comprising first and second control outputs for independently controlling the movement of magnetic bubble domains on said first and said second paths;
- drive means for driving said magnetic bubble domains along said paths comprising:
- first dirve means connected to said first control output, including a magnetic field generator for generating a rotary magnetic field at a first frequency in the plane of said plate for driving said magnetic bubble domains along said first path;
- and
- second drive means connected to said second control output including a current generator and having current outputs for generating a periodically varying current selectively at a second frequency and a third frequency, wherein said second frequency is equal to said first frequency and said third frequency is at least two times higher than said second frequency, whereby said second frequency controls said replicating and said third frequency controls a rapid data transfer, said terminal on said second path being connected to said current outputs;
- and
- detection means coupled to said plate for detecting the presence of magnetic bubble domains in a specific region of said plate.
6 more elements
A magnetic bubble domain memory comprising:
- a plate of magnetic material capable of supporting magnetic bubble domains, comprising;
- first path for storing and supporting magnetic bubble domains, having a plurality of spaced apart magnetically operative discrete elements;
- a second path for storing and transporting magnetic bubble domains comprising:
- at least one current conductor having a spatially periodic structure and having terminals connected thereto;
- a plurality of interconnection means disposed between said first path and said second path for replicating in parallel the information content of a magnetic bubble on said first path onto a single magnetic bubble on said second path for realizing a parallel to serial conversion;
- control means comprising first and second control outputs for independently controlling the movement of magnetic bubble domains on said first and said second paths;
- drive means for driving said magnetic bubble domains along said paths, comprising:
- first drive means connected to said first control output;
- a magnetic field generator for generating a rotary magnetic field at a first frequency in the plate for driving said magnetic bubble domains along said first path;
- and
- second drive means connected to said second control output;
- a current generator and having current outputs for generating a periodically varying current at a second frequency which is at least two times higher than said first frequency;
- whereby said first frequency controls said replicating and said second frequency controls a rapid data transfer;
- said terminals on said second path being connected to said current outputs;
- and
- detection means coupled to said plate for detecting the presence of magnetic bubble domains in a specific region of said plate.
13 more elements
Dependencies are inferred from the claim text.