Abstract: The multi-layer magnetic spin-polarized transport and giant magnetoresistance effect are introduced ;the spin-valve giant magnetoresistance muhilayer films with giant magnetoresistanee in the materials aspects of the structure and working principle of distinction are described briefly. The transform of the existing physics laboratory of the university of the experimental apparatus and circuit design experiments simple measurement of these two types of giant magnetoresistance of magnetic properties are used ,which are in accordance with the results of experimental measurements of these two types of sensors and measurement sensitivity in its scope of comparison.

Key words: spin-polarized transport, giant magnetoresistance, spin valve, magnetic properties