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Magnetic and structural properties of glass-coated Heusler-type microwires exhibiting martensitic transformation

機譯：呈現(xiàn)馬氏體相變的玻璃涂層Heusler型微絲的磁性和結(jié)構(gòu)性質(zhì)

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We have studied magnetic and structural properties of the Heusler-type Ni-Mn-Ga glass-coated microwires prepared by Tailor-Ulitovsky technique. As-prepared sample presents magnetoresistance effect and considerable dependence of magnetization curves (particularly magnetization values) on magnetic field attributed to the magnetic and atomic disorder. Annealing strongly affects the temperature dependence of magnetization and Curie temperature of microwires. After annealing of the microwires at 973 K, the Curie temperature was enhanced to about 280 K which is beneficial for the magnetic solid state refrigeration. The observed hysteretic anomalies on the temperature dependences of resistance and magnetization in the as-prepared and annealed samples are produced by the martensitic transformation. The magnetoresistance and magnetocaloric effects have been investigated to illustrate a potential technological capability of studied microwires.
機譯：我們已經(jīng)研究了通過Tailor-Ulitovsky技術(shù)制備的Heusler型Ni-Mn-Ga玻璃微絲的磁性和結(jié)構(gòu)性能。所制備的樣品表現(xiàn)出磁阻效應(yīng)，并且磁化曲線（尤其是磁化值）對歸因于磁性和原子無序的磁場具有相當大的依賴性。退火強烈影響微絲的磁化強度和居里溫度的溫度依賴性。將微絲在973 microK退火后，居里溫度提高到約280 K，這有利于磁性固態(tài)制冷。通過馬氏體相變產(chǎn)生了在制備的和退火的樣品中觀察到的與電阻和磁化強度的溫度依賴性有關(guān)的磁滯異常。已經(jīng)研究了磁阻和磁熱效應(yīng)以說明所研究的微線的潛在技術(shù)能力。

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