Fabrication and Magnetic Characterization of CFO/NiO and CFO/NiS Heterostructures

Abstract

Magnetic analysis of different magnetic bilayers and multilayers is an important step for designing next-generation multiferroic heterostructures. In this study, we have investigated the magnetic interaction at the interface in CFO/NiO hetero-structures grown by pulsed laser deposition on sapphire substrates. The thin film heterostructure samples were characterized by means of X-ray diffraction, scanning electron microscopy (SEM), energy disruptive X-ray spectroscopy (EDS), and superconducting quantum interference device (SQUID) for magnetic measurements. The XRD analysis on different samples shows the crystalline growth of the thin films. The SEM-EDS analysis provides information about structural and elemental compositions of the heterostructure films. A SQUID magnetometer was used to investigate the temperature and field-dependent magnetic properties. To better understand the magnetic properties of the thin film heterostructure samples, zero field cool (ZFC) and field cool (FC) magnetization data were analyzed. At low temperature, ferromagnetic hysteresis loop was observed. A shift in the M-H hysteresis curve was observed for the FC data from the ZFC data, which indicates the presence of exchange bias effect. In addition, we have examined the effect of antiferromagnetic NiS thin films on ferromagnetism of CFO. This study on the magnetic interaction between a ferromagnetic layer and an antiferromagnetic layer can advance the frontier for applications in spin valves, magnetic sensors, and magnetic random access memory.

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Acknowledgements

Ariful Haque and Ahmed R. Mahbub contributed equally to this paper as first authors. We would like to deeply thank the Wright-Patterson Air Force Base for providing us with the technical assistance during data acquisition.

Funding

We would like to acknowledge the National Science Foundation (NSF) grants (DMR-0723105 and DMR-0821159) for supporting this study.

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Correspondence to Ahmed R. Mahbub.

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Mahbub, A.R., Haque, A. & Ghosh, K. Fabrication and Magnetic Characterization of CFO/NiO and CFO/NiS Heterostructures. J Supercond Nov Magn 32, 2857–2864 (2019). https://doi.org/10.1007/s10948-019-5032-5

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Keywords

  • NiO
  • CFO
  • NiS
  • Heterostructure
  • Magnetic measurements
  • Ferromagnetism