Publication Date:
2020
Description:
〈p〉Publication date: 15 April 2020〈/p〉
〈p〉〈b〉Source:〈/b〉 Journal of Magnetism and Magnetic Materials, Volume 500〈/p〉
〈p〉Author(s): Subrata Ghosh, Pintu Sen, Kalyan Mandal〈/p〉
〈div xml:lang="en"〉
〈h5〉Abstract〈/h5〉
〈div〉〈p〉First order coupled magnetostructural transition (MST) between ferromagnetic orthorhombic and paramagnetic hexagonal structure and large magnetocaloric effect are reported in the present article in transition metal based Al doped (Mn〈sub〉0.6〈/sub〉Fe〈sub〉0.4〈/sub〉)NiSi〈sub〉1−〈/sub〉〈em〉〈sub〉x〈/sub〉〈/em〉Al〈em〉〈sub〉x〈/sub〉〈/em〉 (〈em〉x〈/em〉 = 0.06, 0.07) alloys. On doping Al in place of Si, the structural transition temperature is found to shift to around room temperature (~272 K for 〈em〉x〈/em〉 = 0.07) from a high temperature of ~1210 K for MnNiSi system. On further increase in Al doping with 〈em〉x〈/em〉 = 0.08, only magnetic transition is observed at ~145 K. Isothermal magnetic entropy change (ΔS〈sub〉M〈/sub〉) as large as ~20.6 Jkg〈sup〉−1〈/sup〉K〈sup〉−1〈/sup〉 is found for the alloy with 〈em〉x〈/em〉 = 0.07 due to a change of 50 kOe magnetic field. Large value of ΔS〈sub〉M〈/sub〉 observed near room temperature for the alloy with 〈em〉x〈/em〉 = 0.07 enable it as a potential candidate for magnetic refrigerant.〈/p〉〈/div〉
〈/div〉
Print ISSN:
0304-8853
Electronic ISSN:
1873-4766
Topics:
Physics