Anomalously high coercive field magnets with large remanence magnetizations have been prepared from electron-transfer salts of tetracyanoethylene and MnII(porphyrin). These magnets exhibit metamagnetic-like behavior at low temperature but, anomalously, show hysteresis with a large remanent magnetization. Metamagnets that display large coercivity and remanence magnetizations, especially when these values are large, may lead to new technologically important materials.
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Rittenberg et al. (2000) studied this question.