Abstract The influence of internal stresses on magnetic properties of Ni-Mn-Ga glass-coated microwire was investigated. Microwires with Ni63Mn12Ga25 chemical composition, full diameter D = 54.6 μm and metallic nucleus diameter d = 26.7 μm, were prepared by Taylor-Ulitovsky technique. An analysis of a separate influence of stresses, generated during the solidification of metal and those induced by the difference between thermal expansion coefficients of metal and glass, on magnetic properties of Ni-Mn-Ga microwire was done. Carrying out the heat treatment for a different time reveals the influence of the first type of stress. Removing the glass coating show the influence of the second type of stress. To analyze a complex influence of stresses we performed a heat treatment of the microwire after glass coating removal. The coercive force, saturation and remanence magnetization and Curie temperature were compared to show stresses influence. The change of easy magnetization axis direction was found for microwire with removed glass coating. A difference in surface grain size was indicated in the annealed glass-coated microwire and microwire, annealed after glass removal.

中文翻译：

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内应力对 Ni-Mn-Ga Heusler 型微丝磁性能的影响

摘要 研究了内应力对Ni-Mn-Ga玻璃包覆微丝磁性能的影响。通过 Taylor-Ulitovsky 技术制备具有 Ni63Mn12Ga25 化学成分、全直径 D = 54.6 μm 和金属核直径 d = 26.7 μm 的微线。对金属凝固过程中产生的应力以及由金属和玻璃的热膨胀系数之间的差异引起的应力对 Ni-Mn-Ga 微丝磁性能的单独影响进行了分析。进行不同时间的热处理揭示了第一类应力的影响。去除玻璃涂层显示了第二种应力的影响。为了分析应力的复杂影响，我们在去除玻璃涂层后对微丝进行了热处理。强制力，比较饱和和剩磁以及居里温度以显示应力影响。发现去除玻璃涂层的微丝易磁化轴方向发生了变化。在退火的玻璃涂层微丝和微丝中显示出表面晶粒尺寸的差异，微丝在玻璃去除后退火。