Room-temperature coercivity enhancement in mechanically alloyed antiferromagnetic-ferromagnetic powders

Abstract

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The coercivity,HC, and squareness of Co powders have been enhanced at room temperature by mechanically alloying them with antiferromagneticpowders with Néel temperature, TN, above room temperature. The enhancement is maximum after field annealing above TN. The existence of loop shifts and the dependence of HC on the annealing and measuring temperatures indicate that exchange bias effects are responsible for this behavior.