Integrated magneto-resistive sensing of bubble domains
阅读：936发布：2023-02-12
专利汇可以提供Integrated magneto-resistive sensing of bubble domains专利检索，专利查询，专利分析的服务。并且An integrated magneto-resistive sensor for detection of magnetic bubble domains. The sensor is located on the chip in which the bubble domains propagate and can be an integral part of the propagation circuitry. Any material exhibiting a magnetoresistive effect can be used, and permalloy is a preferred material. The sensing element can be made very small, and has a length which is usually about equal to a bubble domain diameter.，下面是Integrated magneto-resistive sensing of bubble domains专利的具体信息内容。
1. An integrated structure for non-destructive sensing of a single-wall magnetic bubble domains, comprising: a magnetic medium in which said single-wall bubble domains can be propagated; propagation means located on said magnetic medium for moving said bubble domains to selected locations within said medium; at least one magneto-resistive sensing element comprising a uniaxial crystal having an easy axis, said element being located near said magnetic medium for detecting the presence and absence of said bubble domains, said sensing element located with respect to said propagation means so that the magnetic flux associated with a bubble domain is sufficient to rotate the magnetization of said sensing element; electrical means for providing electrical current to each of said magneto-resistive sensing elements; and detection means connected to said magneto-resistive sensing elements for sensing the rotation of said magnetization of said sensing elements.
2. The apparatus of claim 1, wherein said at least one sensing element is a single crystal.
3. The apparatus of claim 1, wherein said at least one sensing element has a length in the direction of said easy axis which is approximately the diameter of said bubble domain.
4. The apparatus of claim 3, wherein said current through said sensing element is along said easy axis.
5. The apparatus of claim 1, wherein said sensing elements comprise a portion of said propagation means.
6. The apparatus of claim 5, wherein said propagation means and said sensing elements are comprised of permalloy.
7. The apparatus of claim 5, wherein said sensing elements and said current sources are connected by leads which are located on said propagation means.
8. A magnetic bubble domain system in which said bubble domains can be non-destructively sensed, comprising: a magnetic medium capable of supporting single wall cylindrical magnetic bubble domains; magneto-resistive sensing means located adjacent said medium for detecting said bubble domains when the magnetic flux of said domains intercepts said sensing means, said magnetic flux being sufficient to change the resistance of said sensing means, wherein said sensing means comprises a magneto-resistive sensing element whose resistance depends upon the magnetic flux thereacross, said sensing elements having a length which is approximately equal to a bubble domain diameter, means for establishing current flow through said sensing element, and means to detect said resistance change of said sensing element.
9. A magnetic bubble domain system in which magnetic bubble domains are sensed, comprising: a magnetic sheet in which in which said bubble domains exist, a magneto-resistive sensing element located in flux-coupling proximity to the stray magnetic field from said bubble domains, the resistance of said sensing element changing when said element is intercepted by the stray magnetic field of said bubble domains, electrical means for providing current through said magneto-resistive sensing element, detection means responsive to said resistance change of said magneto-resistive sensing element for detection of said bubble domains.
10. The system of claim 9, where said detection means and said electrical means are connected to said magneto-resistive sensing element at the same locations to define a two-terminal sensing device comprising said magneto-resistive sensing element, said electrical mean, and said detection means.
11. The system of claim 9, where said electrical means is a constant currenT source.
12. The system of claim 9, where said electrical means is a constant voltage source.
13. The system of claim 9, where said magneto-resistive sensing element has a length in the direction of current flow therethrough which is approximately the diameter of said bubble domain.
14. The system of claim 9, where said magneto-resistive sensing element is comprised of permalloy.
15. The system of claim 9, where said magnetoresistive sensing element has a thickness of approximately 200 angstroms.
16. The system of claim 9, where said magneto-resistive sensing element is a uniaxial crystal having an easy axis lying along the direction of current flow therethrough.
17. The system of claim 9, further including propagation means for moving said bubble domains into flux-coupling proximity to said magnetoresistive sensing element.
18. The system of claim 17, where said magneto-resistive element is a portion of said propagation means.
19. The system of claim 17, where said magneto-resistive sensing element and said propagation means are comprised of the same material.
20. The system of claim 19, where said propagation means and said magnetoresistive sensing elements are comprised of permalloy.
21. A magnetic bubble domain system comprising: a magnetic sheet in which said bubble domains exist, at least one magnetoresistive sensing device located in flux-coupling proximity to the stray magnetic field associated with said bubble domains, said magnetoresistive sensing device providing an output indicative of a resistance change of said sensing device when a magnetic field intercepting it changes, said sensing device comprising: a magneto-resistive sensing element whose resistance changes when the stray magnetic field of a bubble domain intercepts it, an electrical means for providing current through said element, a detection means responsive to said resistance change for providing an output indicative of the presence and absence of said bubble domains in flux-coupling proximity to said magneto-resistive sensing element, propagation means for moving said bubble domains into positions of flux-coupling proximity to said magneto-resistive sensing element.
22. The system of claim 21, where said sensing device is a two-terminal device requiring electrical connections only for said electrical means.
23. The system of claim 21, where said detection means and said electrical means are in parallel with said magnetoresistive sensing means.
24. The system of claim 21, where the length of said magneto-resistive element in a direction substantially transverse to the direction of the stray magnetic field from said bubble domains is approximately the diameter of said bubble domains.
25. The system of claim 21, where said mangeto-resistive sensing element is electrically contacted on only two faces thereof.
26. The system of claim 21, where said magneto-resistive sensing element is a portion of said propagation means.
27. The system of claim 21, wherein the direction of current in said magneto-resistive sensing element is along the magnetic easy axis of said element.
28. The system of claim 21, where said magneto-resistive sensing element and said propagation means are comprised of magnetically soft material.
29. The system of claim 28, where said material is permalloy.
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