Magnetic-field-induced twist in Ni-Mn-Ga-Co-Cu microwires

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• 作者：Dexing Liu ; Jie Zhu ; ^{jiezhu@ustb.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Zhiyi Ding ; Xinzhen Zhang ; Yong Zhang ; Daoyong Cong
• 关键词：Magnetic-field-induced twist ; Microwire ; Magnetic shape memory
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：128
• 期：Complete
• 页码：91-94
• 全文大小：763 K

文摘

The microwires with nominal composition of Ni₄₆Mn₂₄Ga₂₂Co₄Cu₄ were prepared by Taylor-Ulitovsky method. Wiedemann effect of as-drawn microwires was investigated and a maximum twist of 1244 ″/cm was obtained under a periodically circular magnetic field Hc (4.3 Oe) and an axial magnetic field Ha = 26 Oe. By eliminating the heat effects on microwires, the pure magnetic-field-induced twist (MFIT) was explored and a maximum MFIT of 234 ″/cm was found under another periodically magnetic field Hc (10 Oe). The relationship between diameters of microwires and the twist was also investigated.