| Summary: | 碩士 === 淡江大學 === 物理研究所 === 81 === This thesis explores magnetic levitation and magnetic friction
of the different compound kinds of Y123 HTSC bulks at 77K and
cylindrical ferromagnets contained lanthanide. About samples,
according the difference of compound kinds, we assorted the
samples to two kinds of superimposition and half-cutted. The
superimpositon is called that put a sample above other one
directly. And the half-cutted is called that use a semicircular
sample and the other one to make up a circular sample. About
magnetic levitation, use the useful electric balance to measure
the hystersis curvilinear relation between magnetic levitation
and displacement (between magnets and superconductors) . Use
the bulks made up the compound kinds of superimposition and
half-cutted to compare the function figures of before and after
made. We found that the bulks used the spuperimpostion kind to
make up that the magnetic levitation is the same as the same
thickness samples. But the bulk used the half-cutted kind to
make up that the manetic levilation is smaller than the bulk
uncutted. About magnetic friction, use the homemade pendulum to
measure the torque generating by magnets rotate from the
leaving-axis to the superconductor bulks. Then use the bulks
made up the above two kinds to compare the function figures of
before and after made. We found that at sttronger magnetic
field (above 130 Gauss) the bulks used the spuperimpostion kind
to make up that the magnetic friction torque increases than the
same thickness samples. But the bulks used the half-cutted kind
to make up that the manetic friction is the same as the bulks
uncutted.
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