Abstract
We designed a series of samples with Co substitution (Fe1−xCoxCr2S4, 0⩽x⩽1) and studied the Co doping effect in FeCr2S4. Spin glass transitions are observed in lower temperature regions and ferrimagnetic transitions are observed in higher temperature regions. The paramagnetic-ferrimagnetic transition temperature (TC) increases with the amount of Co substitution. In order to clarify the magnetic character at the transition point, a critical exponent was obtained at about TC. The exponent changes from Ising to Heisenberg as x increases.
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