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<p>We have investigated the influence of Ni and Co doping for Mn in Ni<sub>50</sub>Mn<sub>20</sub>(Ni/Co)<sub>5</sub>Ga<sub>25</sub> by means of XRD, optical microscopy, resistivity and magnetization measurements. Both the alloys are martensitic at room temperature. Temperature-dependent XRD data shows that the martensitic transition in the Ni and Co doped sample occurs close to 700&#xa0;K and 900&#xa0;K respectively. Hysteresis seen in the resistivity and magnetization studies on both the samples in the martensitic regime is attributed to the dynamics associated with the ferromagnetic clusters developed just below T<sub>C</sub>. By comparing the results on the two alloys, we show that the differences in their structural, magnetic and electrical properties can be mainly attributed to the difference in the electronic band structure brought about by these two (Ni vs. Co) substituents.</p>

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A comparative study of the structural, magnetic and electrical properties of Ni50Mn20(Ni/Co)5Ga25

  • 期刊论文

  • 发表日期：

    2025年2月23日

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  • Durgesh Singh,
  • Akhilesh Kumar Patel,
  • Barnabha Bandyopadhyay,
  • R. Venkatesh,
  • Satyam Kumar,
  • K. G. Suresh

摘要

We have investigated the influence of Ni and Co doping for Mn in Ni50Mn20(Ni/Co)5Ga25 by means of XRD, optical microscopy, resistivity and magnetization measurements. Both the alloys are martensitic at room temperature. Temperature-dependent XRD data shows that the martensitic transition in the Ni and Co doped sample occurs close to 700 K and 900 K respectively. Hysteresis seen in the resistivity and magnetization studies on both the samples in the martensitic regime is attributed to the dynamics associated with the ferromagnetic clusters developed just below TC. By comparing the results on the two alloys, we show that the differences in their structural, magnetic and electrical properties can be mainly attributed to the difference in the electronic band structure brought about by these two (Ni vs. Co) substituents.