期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 538, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2021.168283
关键词
Magnetocalorics; Infrared thermography; Ferromagnetic shape memory
The study investigated the MCE of a bulk Ni44Co6Mn30Ga20 sample at the microscale using infrared thermography. It found that around the reverse martensitic transformation, an inverse MCE was observed with strong spatial inhomogeneity, while this behavior was not observed during the direct martensitic transformation on cooling. This reveals significant novelty in the manifestation of MCE at the microscopic scale associated with phase dynamics.
To study the MCE at the microscale with infrared thermography, a bulk Ni44Co6Mn30Ga20 sample was investigated. Direct measurements of the MCE were performed for temperatures around the reverse and direct martensitic transformation, by applying and removing a similar to 1.2 T magnetic field to the sample and recording the changes in its surface temperature with an IR camera. This was done for different sample temperatures on heating (from 273 K to 327 K) and cooling (from 327 K to 267 K). For sample temperatures around the reverse martensitic transformation, the inverse MCE is observed, with Delta T between -0.04 K and -0.54 K. The effect displays strong spatial inhomogeneity at the microscopic scale, which varies considerably with the progress of phase transformation. This behavior is not observed for the direct martensitic transformation (on cooling). The study reveals substantial novelty in the manifestation of the MCE at the microscopic scale, associated with phase dynamics, showing a different and inhomogeneous behavior on heating and cooling of a FSMA around the martensitic transition.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据