Magnetic Structures in Copper-Manganese Alloys

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Abstract
A neutron diffraction study of a series of substitutional solid solutions up to 85 atomic percent manganese in copper has shown that at about 13 atomic percent manganese, a broad intensity maximum appears in the region of (100) reflection of the face-centered cubic pattern of copper. A correlation of this maximum with the magnetic attraction of the specimens indicates that it is at least in part due to short-range magnetic order. Its intensity decreases at compositions greater than 50 atomic percent manganese. Above 69 atomic percent manganese an antiferromagnetic structure is observed and is interpreted as due to an antiferromagnetic coupling between manganese atoms as the manganese concentration becomes predominant.