Abstract
Abstract We present the results concerning field dependences of magnetization for Zn 1 - x Cu x Cr 2 Se 4 mixed spinels studied at low temperatures with the use of both high magnetic stationary fields up to 14 T and high pulsed fields up to 25 T. From the isotherms of static magnetization we have obtained the incremental high field susceptibility and from pulsed measurents the differential one. The temperature and concentration ( x ) dependences of the calculated high field susceptibility χ hf are interpreted based on the magnetic properties of the spinels under study presented in refs. [4–7]. The greatest changes of χ hf were observed in the intermediate concentration range exhibiting a conical spin structure, in which the appearance of the double-exchange interaction between Cr 3+ and Cr 4+ ions plays a main role. It drives the transition from a noncollinear magnetic structure to a ferromagnetic one with increasing copper concentration.
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