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Magnetic interactions and electronic structure of \(\hbox {Pt}_{2}\hbox {Mn}_{1-x}\hbox {Y}_{x} \hbox {Ga (Y = Cr and Fe)}\) system: An ab-initio calculation

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Abstract

First-principles density functional theory-based calculations have been carried out to predict the effects of Mn replacement by Fe and Cr on electronic as well as magnetic properties of \(\hbox {Pt}_{2}\hbox {MnGa}\) and \(\hbox {Ni}_{2}\hbox {MnGa}\). All the materials studied here are predicted to have conventional Heusler alloy structure in their ground state and they are found to be electronically stable on the basis of their respective formation energy. The replacement of Mn by Fe leads to a ferromagnetic ground state whereas in case of Mn replacement by Cr an intrasublattice antiferromagnetic configuration has been observed to have lower energy. We study the magnetic exchange interaction between the atoms for the materials with ferromagnetic and antiferromagnetic configurations to show the effects of Fe and Cr substitution at Mn site on the magnetic interactions of these systems. Detailed analysis of electronic structure in terms of density of states has been carried out to study the effect of substitution.

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Acknowledgements

Authors thank P D Gupta and P A Naik for facilities and encouragement throughout the work. The scientific computing group, computer centre of RRCAT, Indore and P Thander are thanked for help in installing and support in running the codes. S R Barman and C Kamal are thanked for useful discussions. TR thanks HBNI, RRCAT for financial support.

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Authors and Affiliations

  1. Homi Bhaba National Institute, Training School Complex, Anushakti Nagar, Mumbai, 400094, India

    Tufan Roy & Aparna Chakrabarti

  2. Theory and Simulations Laboratory, Human Resources Development Section, Raja Ramanna Centre for Advanced Technology, Indore, 452013, India

    Aparna Chakrabarti

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  1. Tufan Roy
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  2. Aparna Chakrabarti
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Correspondence to Aparna Chakrabarti.

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Roy, T., Chakrabarti, A. Magnetic interactions and electronic structure of \(\hbox {Pt}_{2}\hbox {Mn}_{1-x}\hbox {Y}_{x} \hbox {Ga (Y = Cr and Fe)}\) system: An ab-initio calculation. Pramana - J Phys 89, 6 (2017). https://doi.org/10.1007/s12043-017-1401-4

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  • DOI: https://doi.org/10.1007/s12043-017-1401-4

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