用于通过磁力显微镜对铁磁形状记忆合金进行原位研究的机械加载框架的设计与应用

Design and application of a mechanical load frame for in situ investigation of ferromagnetic shape memory alloys by magnetic force microscopy.

作者信息

Niklasch D, Maier H J, Karaman I

机构信息

Lehrstuhl fur Werkstoffkunde (Materials Science), University of Paderborn, Paderborn, Germany.

出版信息

Rev Sci Instrum. 2008 Nov;79(11):113701. doi: 10.1063/1.3010383.

DOI:10.1063/1.3010383

PMID:19045889

Abstract

An in situ mechanical load frame has been developed for a commercially available atomic force microscope. This frame allows examining changes in topography and magnetic domain configuration under a given constant load or strain. First results obtained on Ni-Mn-Ga ferromagnetic shape memory alloy single crystals are presented. The magnetic force microscopy (MFM) measurements under different strain levels confirm the one-to-one correspondence, i.e., the magnetomicrostructural coupling between the martensite twins and the magnetic domains. Additionally, the growth of the twin variant with favorable orientation to the compression axis during martensite detwinning was observed. It will be shown that this load frame can be used for the investigation of the relationship between the microstructure and the magnetic domain structure in ferromagnetic shape memory alloys by MFM.

摘要

已为一款商用原子力显微镜开发了一种原位机械加载框架。该框架能够在给定的恒定载荷或应变下检测形貌和磁畴结构的变化。文中展示了在镍锰镓铁磁形状记忆合金单晶上获得的初步结果。在不同应变水平下进行的磁力显微镜（MFM）测量证实了一一对应关系，即马氏体孪晶与磁畴之间的磁微结构耦合。此外，还观察到在马氏体去孪晶过程中，与压缩轴取向有利的孪晶变体的生长。结果表明，该加载框架可用于通过磁力显微镜研究铁磁形状记忆合金中微观结构与磁畴结构之间的关系。