Abstract

We have investigated Co-Cr alloys with chromium concentrations slightly larger than the critical concentration for long range magnetic order (25 %). Our results suggest a strong inhomogeneous magnetic state consisting of clusters with a large distribution of formation temperatures. At low temperatures one observes a superparamagnetic to ferromagnetic transition followed by a ferromagnetic to spin glass transition at lower temperature in the range of concentration 25 % to 29 %.

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