Abstract
Magnetic transitions and magnetoresistance of HfFe6Ge6-type Y0.8Dy0.2Mn6Sn6 compound have been investigated in the temperature range of 5–375 K. It was found that the compound displays paramagnetism, ferrimagnetism, antiferromagnetism, and reentrant ferrimagnetism with decreasing temperature. At low temperatures, the strong exchange interaction between the Dy and Mn sublattices results in ferrimagnetism. The metamagnetic transition from the antiferro- to ferrimagnetic state can be induced by a fairly small threshold field (⩽7 kOe). The magnetic transition is accompanied by a large magnetoresistance effect of about −29% and −7% at 5 and 293 K, respectively.
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