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The magnetization of ZrZn 2 has been measured as a function of magnetic field up to 48 kOe and of temperature from 2.0°K to 380°K. The intrinsic magnetization extrapolated to 0°K increases strongly with external field. The magnetization at low field is found to vary as T 2 at low temperatures. The Curie temperature for a typical sample is 17.8°K, whereas the hysteresis loop is observed up to 30°K. A comment on the Curie temperature quoted in literatures has been made. The difference in magnetic properties among different samples has been noticed. The itinerant electron model of ferromagnetism can account for qualitatively the observed magnetic properties, whereas the localized-spin model proves inappropriate for this material.
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Ogawa et al. (1967) studied this question.
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