Hard-magnetic film overlay apparatus and method for magnetic mobile domain control
AssigneeInternational Business Machines Corporation
InventorOtto Voegeli
Life of this patent
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Abstract
Stationary patterns of magnetic domains in a film layer of magnetically hard material define local field gradients for movement control of single-wall domains located in a contiguous sheet of magnetic "bubble" material. Suitable patterns of uniformly magnetized regions are established in the hard-magnetic film to provide the control pattern. A second garnet film of suitable composition, for instance, may be grown epitaxially on the bubble medium to provide the hard magnetic control film. Bubble domain confinement and propagation patterns are established in the hard-magnetic film by conventional recording methods or the desired pattern can be generated by projection or scanning the pattern with a light beam or an electron beam, or by thermomagnetic transfer from a master pattern.
Claims25
A single-wall magnetic domain arrangement comprising:
- a first layer of materials in which mobile magnetic domains can be moved;
- a second layer of magnetically hard material placed contiguous to a surface of said first layer;
- and
- stationary magnetic domains in said second layer arranged in a permanent arbitrarily selected control configuration to provide a predetermined path substantially independent of the bias field for the movement of the mobile domains in said first layer.
A single-wall domain arrangement comprising:
- a layer of material in which single-wall mobile magnetic domains can be moved;
- a film of magnetically hard material placed contiguous to a surface of said layer;
- a stationary magnetic domain pattern established in said film defining a propagation control channel for the movement of mobile domains in said layer;
- and
- propagation means for generating a repetitive magnetic field for moving the mobile domains under control of said channel.
A single-wall domain arrangement comprising:
- a sheet of magnetic material in which single-wall mobile magnetic domains can be propagated;
- a film of magnetically hard material placed contiguous to a surface of said sheet;
- a lattice array of single-wall mobile magnetic domains formed in said sheet;
- a confinement configuration established by stationary magnetic domains in said film and surrounding said lattice array, the positions of said mobile domains in said lattice array being substantially determined by said confinement configuration and interaction between said mobile domains.
A method of providing a single-wall magnetic domain arrangement comprising the steps of:
- fabricating a layer of a host material capable of supporting mobile magnetic domains;
- fabricating a control film of a hard-magnetic material;
- placing said fabricated control film contiguous to said fabricated layer of host material;
- and
- establishing a permanent arbitrarily selected stationary patterned magnetic domain configuration in said control film to provide a predetermined path substantially independent of the bias field for the movement of the mobile domains in said layer of host material.
A method of providing an arrangement for control of mobile magnetic domains in a medium supporting the mobile magnetic domains comprising the steps of:
- fabricating a control film of a hard-magnetic material on said mobile domain support medium;
- and
- establishing a permanent arbitrarily selected stationary patterned magnetic domain configuration in said control film to provide a predetermined path substantially independent of the bias field for the movement of the mobile domains in said support medium.
A method of providing a single-wall magnetic domain arrangement comprising the steps of:
- fabricating a layer of a host material capable of propagating single wall mobile domains;
- providing at least one mobile domain in said host layer;
- forming a control film of hard-magnetic material on said host layer;
- and applying an external magnetic field to said formed control film in a manner to establish a permanent arbitrarily selected patterned stationary magnetic domain configuration in said film to provide a predetermined path substantially independent of the bias field for the movement of said mobile domains.
A method of providing an arrangement for control of mobile single-wall magnetic domains in a medium supporting the mobile domains comprising the steps of:
- fabricating a spacing film of an insulating material on said mobile domain support medium;
- fabricating a control film of a hard-magnetic material on said spacing film;
- and
- establishing a permanent arbitrarily selected stationary patterned magnetic domain configuration in said control film to provide a predetermined path substantially independent of the bias field for the movement of the mobile domains in the support medium.
A method of providing a single-wall magnetic domain arrangement comprising the steps of:
- fabricating a continuous first sheet of a host material capable of propagating single-wall magnetic domains;
- fabricating a continuous second sheet of hard-magnetic material;
- applying an external magnetic field to said second sheet in a manner to provide a permanent arbitrarily selected patterned stationary magnetic domain configuration in said second sheet for controlling the propagation of the single wall domains substantially independent of said field;
- laminating said first and second sheets together;
- and
- providing at least one single wall domain in said host material.
Dependencies are inferred from the claim text.