顺磁材料局部加热的类抗磁响应
Diamagnetic-like response from localised heating of a paramagnetic material
摘要：
在探索材料非平衡性质的过程中，由电流诱导的非平衡稳态是一个很有吸引力的研究方向，其中可能出现非常规态。然而，不可避免的焦耳加热所造成的流动电流要求开发新的测量协议，特别注意所涉及的背景材料的物理性质。在这里，我们证明了局部加热可以产生一个大的，虚假的抗磁性信号。这是由于加热样品引起的背景磁化强度的局部降低而发生的，前提是背景材料具有类居里磁化率。我们的实验结果，以及数值计算，构成了一个重要的积木进行精确的磁场测量下的电流流动。
英文摘要：
In the search of material properties out-of-equilibrium, the non-equilibrium steady states induced by electric current are an appealing research direction where unconventional states may emerge. However, the unavoidable Joule heating caused by flowing current calls for the development of new measurement protocols, with a particular attention to the physical properties of the background materials involved. Here, we demonstrate that localised heating can give rise to a large, spurious diamagnetic-like signal. This occurs due to the local reduction of the background magnetisation caused by the heated sample, provided that the background material has a Curie-like susceptibility. Our experimental results, along with numerical calculations, constitute an important building block for performing accurate magnetic measurements under the flow of electric current.
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