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Modifications in ferromagnetic properties of MnAl bilayer thin films induced by swift heavy ion irradiation

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Abstract

In this paper, we report the effects of swift heavy ion (SHI) irradiation on structural, microstructural, and magnetic properties of Mn/Al bilayer thin films deposited by the evaporation technique. The as-deposited thin films were irradiated by a 100 MeV Ag ion beam with different fluences (1 × 1013–1 × 1014 ions/cm2). The enhanced ferromagnetic properties with perpendicular magnetic anisotropy have been achieved in the irradiated films with the increase in irradiation fluence, which were supported by the GIXRD, VSM, and MOKE results. The AFM study suggests that the average grain size was obtained in the range of 32–67 nm for all the films. The present study demonstrates that SHI irradiation improves the ferromagnetic properties of Mn/Al bilayer thin film, which makes it a promising material for rare-earth-free permanent magnets and spintronic applications.

Graphical abstract

The graphical abstract shows the schematic diagrams of (a) the crystal structure of τ-MnAl alloy; (b) the as-deposited Mn/Al bilayer thin film on a Si substrate; (c) polar and longitudinal MOKE configuration with orientation of magnetization (M), direction of incidence (i) and reflection (r) of light.

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Experimental data used in this study are available from the corresponding author upon reasonable request.

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Acknowledgments

The authors are grateful to the Director CSIR-NPL, Delhi for his encouragement. The authors express their sincere thanks to the Pelletron Accelerator Group, IUAC, New Delhi, and the staff of MCX Beamline, Synchrotron, Trieste, Italy for their support. The authors are thankful for the financial support under the Indo-Italian Programme of Cooperation for performing the experimental work in MCX Beamline, Synchrotron, Trieste, Italy.

Funding

H. Khanduri acknowledges the Department of Science and Technology, Government of India, for the DST-INSPIRE Faculty Award (DST/INSPIRE/04/2017/002826). J. Link and R. Stern are supported by the European Regional Development Fund Project (TK134) and the Estonian Research Agency Project (PRG4 and IUT23-9).

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Authors and Affiliations

  1. Indian Reference Materials Division, CSIR-National Physical Laboratory, New Delhi, 110012, India

    H. Khanduri, Prashant Kumar & R. P. Pant

  2. Jaypee University of Engineering and Technology, Guna, MP, 473226, India

    Mukesh C. Dimri

  3. Inter-University Accelerator Centre, New Delhi, 110067, India

    S. A. Khan

  4. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India

    Prashant Kumar & R. P. Pant

  5. National Institute of Chemical Physics and Biophysics, 12618, Tallinn, Estonia

    J. Link & R. Stern

  6. Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi, 110016, India

    Nanhe Kumar Gupta

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Khanduri, H., Dimri, M.C., Khan, S.A. et al. Modifications in ferromagnetic properties of MnAl bilayer thin films induced by swift heavy ion irradiation. Journal of Materials Research 37, 2468–2482 (2022). https://doi.org/10.1557/s43578-022-00667-2

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