Mn位掺杂对反铁磁Mn $_5$ Si $_3$合金反磁滞和热磁不可逆行为的影响
Mn-site doping and its effect on inverted hysteresis and thermomagnetic irreversibility behavior of antiferromagnetic Mn$_5$Si$_3$ alloy
摘要：
研究了Mn位掺杂的Mn（$_{5-x}$ A $_x$ Si $_3$）金属间化合物硅化锰合金（$x$ = 0.05，0.1，0.2和A = Ni，Cr）的结构和磁行为，重点研究了反磁滞行为和热磁不可逆性。室温X射线粉末衍射数据证实，所有掺杂的合金都以六方$D8_8$型结构结晶，空间群为$P6_3/mcm$。发现掺杂合金在从室温冷却过程中表现出顺磁（PM）-共线反铁磁（AFM 2）-非共线反铁磁（AFM 1）转变。随着Ni/Cr浓度的增加，AFM 1-AFM 2转变温度和场的临界值都显著降低。反磁滞回线，场诱导逮捕，和热磁逮捕，未掺杂的Mn $_5$ Si $_3$合金的关键功能，被发现显着影响Mn位掺杂，并最终消失与4\%的掺杂。
英文摘要：
The structural and magnetic behavior of Mn-site doped intermetallic manganese silicide alloys of nominal compositions Mn$_{5-x}$A$_x$Si$_3$ ($x$ = 0.05, 0.1, 0.2 and A = Ni, Cr) have been investigated with a focus to the inverted hysteresis behavior and thermomagnetic irreversibility. Room temperature x-ray powder diffraction data confirm that all the doped alloys crystallize in hexagonal $D8_8$ type structure with space group $P6_3/mcm$. The doped alloys are found to show paramagnetic (PM) - collinear antiferromagnetic (AFM2) - noncollinear antiferromagnetic (AFM1) transitions during cooling from room temperature. A significant decrease in the critical values of both AFM1-AFM2 transition temperatures and fields have been observed with the increasing Ni/Cr concentration. Inverted hysteresis loop, field-induced arrest, and thermomagnetic arrest, the key features of the undoped Mn$_5$Si$_3$ alloy, are found to be significantly affected by the Mn-site doping and eventually vanishes with 4\% doping.
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