New ferrimagnetic spinel compositions in the system MCr2S4−xSex where M=Fe,Co, Mn |
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Authors: | P. Gibart M. Robbins V.G. Lambrecht |
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Affiliation: | Laboratoire de Magnétisme CNRS, Bellevue, France;Bell Laboratories, Marray Hill, N.J. 07974, U.S.A. |
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Abstract: | Phase relationship between ferrimagnetic semiconducting spinels of the type MCr2S4 and defect NiAs compositions of the type MCr2Se4 (where M=Mn, Fe, Co) are established. It was found that the amount of Se which can be substituted, with retention of the spinel structure, decreases from MnCr2S4?xSex (x=0 to x=2) to FeCr2S4?xSex (x=0 to x=1·25) to CoCr2S4?xSex (x=0 to x=1). This phenomena is accounted for on the basis of sulfide spinel stability and unit cell size. The Curie temperatures of the spinel compositions decrease slowly with increasing Se content. This is presumably caused by weakening of the spinel A-B superexchange interaction. |
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