Martensite transformation and magnetic properties of Ni50Mn25Ga25–xFex ferromagnetic microwires for application in microdevices. Issue 4 (6th February 2015)

• Record Type: Journal Article
• Authors: Liu, Yanfen; Zhang, Xuexi; Xing, Dawei; Shen, Hongxian; Chen, Dongming; Liu, Jingshun; Sun, Jianfei
• Is Part Of: Physica status solidi. Volume 212:Issue 4(2015:Apr.)
• Page Start: 855
• Page End: 861
• Publication Date: 2015-02-06
• Subjects: Solid state physics -- Periodicals; Solids -- Industrial applications -- Periodicals; 530.41
• DOI: 10.1002/pssa.201431776
• Languages: English
• ISSNs: 1862-6300

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="pssa201431776-sec-0001" sec-type="section"> <p>Ni₅₀Mn₂₅Ga_{25–<italic>x</italic>}Fe<italic>_x</italic> (1 ≤ <italic>x</italic> ≤ 6) microwires with a diameter of 30–50 µm were prepared by melt‐extraction. The effects of Fe doping on the martensite transformation temperature, Curie point and magnetic properties before and after chemical ordering treatments were investigated. Experimental results show that Ni₅₀Mn₂₅Ga_{25–<italic>x</italic>}Fe<italic>_x</italic> microwires exhibit typical thermoelastic martensite transformation and magnetic transition. Transformation temperatures of the microwires increase with Fe content with a rate of 27.3 K/at%. Thermal hysteresis during martensite transformation is lowered after Fe doping. The Curie point of Ni₅₀Mn₂₅Ga_{25–<italic>x</italic>}Fe<italic>_x</italic> (1 ≤ <italic>x</italic> ≤ 6) microwires keeps stable at 390 K, which is 25 K higher compared with Ni₂MnGa ternary alloy. After chemical ordering heat treatment, the microwires exhibit a typical ferromagnetic transition and a higher saturation magnetization at low field compared to as‐extracted microwires.</p> </sec> </abstract>