用扫描霍尔探针显微术研究$Mn_{1.85}Co_{0.15}Sb$中过冷和过热旋节线的热磁不可逆性
Real Space Visualization of Thermomagnetic Irreversibility within Supercooling and Superheating Spinodals in $Mn_{1.85}Co_{0.15}Sb$ using Scanning Hall Probe Microscopy
摘要：
用扫描霍尔探针显微镜研究了多晶$Mn_{1.85}Co_{0.15}Sb$在120 K和5 T磁场下无序展宽和磁场诱导的一级反铁磁-亚铁磁相变的相共存。我们观察到了随磁场变化的磁滞现象以及介观长度尺度上共存的反铁磁和亚铁磁状态的演变。这些研究表明，在低场下，系统的磁状态取决于达到120 K所遵循的路径。当测量温度从5 K升高到120 K时，第一次和第二次磁场增加循环的低场磁态在介观上是不同的，而当测量温度从300 K降低到120 K时，在测量精度范围内是相同的。
英文摘要：
Phase coexistence across disorder-broadened and magnetic-field-induced first order antiferromagnetic to ferrimagnetic transition in polycrystalline $Mn_{1.85}Co_{0.15}Sb$ has been studied mesoscopically by Scanning Hall Probe Microscope at 120K and up to 5 Tesla magnetic fields. We have observed hysteresis with varying magnetic field and the evolution of coexisting antiferromagnetic and ferrimagnetic state on mesoscopic length scale. These studies show that the magnetic state of the system at low field depends on the path followed to reach 120 K. The low field magnetic states are mesoscopically different for virgin and second field increasing cycle when 120 K is reached by warming from 5K, but are the same within measurement accuracy when the measuring temperature of 120K is reached from 300K by cooling.
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