Direct measurement of the dependence of granular giant magnetoresistance on the relative orientation of magnetic granules
Experiments have been designed to vary the relative angle between the magnetic moments of different Co granules in Cu80Co20 granular system. The moments of granules are mostly aligned in the same direction by field cooling to low temperature in a high magnetic field. A small field applied at an angle relative to the cooling field rotates the moments of a portion of the granules that have small particle size and coercivity. It is found that the giant magnetoresistance (GMR) varies linearly with cosf, where f is the relative angle between the magnetic axes of granules. This behavior disappears if ...
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