Let us now review the "special" magnetization process for generating the hard bubbles in the disk magnets. Since I do not (yet) have the equipment to do the special magnetization required, I can not give you exact details. However, the general process (mostly from the literature on the formation of hard magnetic bubbles in garnet materials) is as follows:
The disk magnets to be magnetized are to be placed in a constant (DC) magnetic field close to the material's magnetic saturation. Then, short magnetic pulses are to be applied. The pulses should have a rise time of approximately 1 micro-second. (1x10^-6 seconds) The DC magnetic field plus the pulsed magnetic field should probably not saturate the material.
According to the literature, the formation of hard magnetic bubbles can be enhanced if the material is cooled. In some materials, formation of hard magnetic bubbles is "suppressed" at room temperature. The amount of cooling required will depend on the material used. I recommend trying "dry ice" as it is less expensive than liquid nitrogen.
Now for the most questionable aspect...
We don't want just any old type of hard magnetic bubbles. We need the magnetic bubbles to be either all S = positive or all S = negative. (Their "state" signs need to be the same.) We might be able to accomplish this if we place the disk magnet in an electric field during the magnetization process. The idea being that the electric field will give a preferred direction to the "twisting" of the magnetization vector during the formation of the hard magnetic bubbles. The strength of this electric field will need to be determined and will probably vary depending on the type of magnetic material used. (Note that this is the only aspect of the magnetization process for which I can find no reference in the scientific literature. So I am not 100% certain that the application of the electric field will work as described. If it doesn't then some other method will need to be found to "load up" the disk magnet with thousands of hard bubbles all with the same state sign.) (I have seen a reference to Floyd Sweet's work in which it is claimed that he used both an AC magnetic field, cooled the magnets and sometimes applied an electric field during the magnetization.)
I would recommend trying the ferrite magnetic materials first. I have many anisotropic Barium Ferrite disk magnets all ready to be tried as soon as the magnetizer is built. I also plain to try anisotropic Strontium Ferrite disks as these are easy to obtain and are comparatively inexpensive.
As with any area of research, there is a lot more detail involved. But I hope I have given you the basic idea behind my magnetic motor idea.
The information provided here is subject to patent protection. USA patent pending, June, 1998
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