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Disorder Induced Magnetic Behavior of Non-Stoichiometric Co0.75Mn0.5Fe0.75Si Full-Heusler Alloy

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Abstract

Many stoichiometric Heusler alloys have been extensively investigated in recent years due to their wide range of magnetic properties. However, a lack of investigation has been found for non-stoichiometric Heusler alloys. This report endeavored to grow few non-stoichiometric compositions but only succeeded in growing Co0.75Mn0.5Fe0.75Si composition. It is crystallized in LiMgPdSn prototype (space group-F43m) structure having lattice parameter of 5.66 Å, and transmission electron microscopy reveals a single phase of Co0.75Mn0.5Fe0.75Si quaternary Heusler alloy. Magnetization variation with applied magnetic field reveals slightly deviated from the magnetic moments (~ 3.53–3.70 \({\upmu }_{\mathrm{B}}/\mathrm{f}.\mathrm{u}.\)) of stoichiometric CoFeMnSi alloys. Interestingly, the magnetic moment of Co0.75Mn0.5Fe0.75Si is found to be 3.80 \({\upmu }_{\mathrm{B}}/\mathrm{f}.\mathrm{u}.\) at room temperature, which is greater than the magnetic moments (3.44 \({\upmu }_{\mathrm{B}}/\mathrm{f}.\mathrm{u}.\)) at 5 K temperature. Moreover, a significant splitting between zero-field cooled (ZFC) and field cooled (FC) curve points towards the co-existence of the ferromagnetic (FM) and antiferromagnetic (AFM) state in the Co0.75Mn0.5Fe0.75Si sample, which is associated due to disorder present in a cubic structure. Thus, the presence of exchange biasing associated with the FM and AFM eventually shows extreme importance in magneto-resistive device and sensors, which is not evidenced in stoichiometric Heusler alloys.

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Acknowledgements

This work is highly dedicated to our late great mentor, Dr. D. K. Misra, who has passed away recently. One of the authors, Bal Govind, acknowledges the Council of Scientific and Industrial Research (CSIR)-SRF (Budget Head-90807) for financial support. Bal Govind also highly acknowledges Mr. Krishna Kandapal for his support in material sealing and Mr. J. S. Tawale for the SEM characterization.

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Authors and Affiliations

  1. CSIR-National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi, 110012, India

    Bal Govind, Sahiba Bano, Ashish Kumar & V. P. S. Awana

  2. AcSIR, Academy of Scientific & Innovative Research, Ghaziabad, Uttar Pradesh, 201002, India

    Bal Govind, Sahiba Bano, Ashish Kumar & V. P. S. Awana

  3. Indian Institute of Technology, Banaras Hindu University, Varanasi, 221005, India

    Purnima Bharti

  4. Special Centre for Nano Science, Jawaharlal Nehru University, New Delhi, 110067, India

    Satyendra Singh

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  1. Bal Govind
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Correspondence to Bal Govind.

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Govind, B., Bharti, P., Bano, S. et al. Disorder Induced Magnetic Behavior of Non-Stoichiometric Co0.75Mn0.5Fe0.75Si Full-Heusler Alloy. J Supercond Nov Magn 35, 445–453 (2022). https://doi.org/10.1007/s10948-021-06076-6

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