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ABSTRACT
In this study, nanocrystalline Ni100-xCux alloy films have been synthesised using DC magnetron co-sputtering under argon gas atmosphere to analyse their superparamagnetic behaviour. The nanocrystalline nature and the grain size of the alloy films have been measured using grazing incidence x-ray diffraction (GIXRD) and a transmission electron microscopy (TEM). The M-H curves obtained using superconducting quantum interference device provides evidence for superparamagnetic behaviour of the nanocrystalline Ni100-xCux alloy films. For the Ni89Cu11 alloy films, the highest value (456 emu/cm3) of saturation magnetisation has been measured. Zero field cooling (ZFC) and field cooling (FC) data obtained from superconducting quantum interference device (SQUID) showed the dependence of blocking temperature, TB on Cu concentration of the investigated NiCu alloy. The blocking temperature is observed to decrease from 44 K to 33 K with increase in Cu concentration from 11 to 28 wt%.
Acknowledgements
Dr Mukesh Kumar is thankful to the SGT University, Gurugram for providing him the necessary research facilities. He is also grateful to Indian Institute of Technology, Kharagpur for their support in the experimental works.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Additional information
Notes on contributors
Mukesh Kumar
Dr Mukesh Kumar is working as an Associate Professor & Head Department of Physics, Faculty of Science, Shree Guru Gobind Singh Tricentenary University, Gurugram, Haryana. Prior to this, he worked as an Assistant Professor in the Department of Physics at Dr B R Ambedkar National Institute of Technology, Jalandhar from Jan 2015 to Dec 2016. He has also worked as a Post-doctoral Research Associate in the Department of Materials Engineering at the Indian Institute of Science, Bangalore from Sept 2013 to Dec 2014. During his Post-doctorate he worked on Boeing Co., sponsored project entitled “Processing-Microstructure-Texture relationship in Ti5553 alloys“. He did Ph.D. from Indian Institute of Technology, Kharagpur. His research work was focused on Processing and structure-property relations of Ni-TiN nanocomposite thin films deposited by reactive RF/DC magnetron co-sputtering. He has published total twelve papers in peer reviewed journals, filed one Australian patent, presented papers in several National/International Conferences, participated in several FDPs, Workshops, Short-term courses etc. He has guided 6 students for their M. Sc. project and his research area focuses on Ni-based alloys and composites for industrial applications, and magnetic nanomaterials for biomedical applications.
J. R. Ansari
Dr. Jamilur R. Ansari is currently working as an Assistant Professor of Physics at P.D.M University, Bahadurgarh, India. He obtained his M.Sc. from Jamia Millia Islamia, New Delhi and PhD degree in the field of Physics from G.G.S. Indraprastha University, Delhi, India. He is having 16 years of teaching and research experience with publications in SCI journals. Dr. J. R. Ansari has been acknowledged as the outstanding contributor for reviewing in 2020 by IOP Journal. He has guided 11 students in their M.Sc. Project and published a few papers with them. His research focuses on MXenes, perovskites, metal-semiconductor, magnetic, 2D materials, QDs, self-assembly which involves photo-catalysis, solar cells, sensing and biomedical applications.
M. T. Beig
Dr. M. T. Beig has joined SGT University in Aug. 2019. He has completed his MSc from Jamia Millia Islamia University and B.Sc. from AMU. He finished his PhD from University of North Texas, USA in 2015. Prior to joining Ph.D., he worked as a Research Assistant at ISRO for three years. At ISRO his worked mainly focused on simulating antenna using the finite element-boundary integral method and Terahertz imaging. During Ph.D., his work involved the study of chaos and fractals, Critical phenomena, Self-organized criticality, Mean-field behavior and emergent complex phenomena evident in dynamical systems shown near a critical point of a second-order phase transition.