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<p>Herein, we report detailed magnetic characteristics of 10-nm thick Q-carbon films grown over a large area. Following the Bloch spin wave theory, we show that Q-carbon exhibits robust room-temperature ferromagnetism with a surprisingly high Curie temperature of ~ 556&#xa0;K. The square-root dependence of coercivity on temperature indicates homogeneous magnetic interactions in the sample. Finally, through ferromagnetic resonance spectroscopy measurements, we show that the spin interactions in Q-carbon are strong and intrinsic to the system. We envisage that the intrinsic ferromagnetism in Q-carbon opens a new frontier for carbon-based systems in spintronic devices.</p> Graphical abstract <p></p>

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Magnetic evaluation of Q-carbon thin films grown on a large scale

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月2日

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  • Naveen Joshi,
  • Pranay Kalakonda,
  • Kishan Lal Kumawat,
  • Sachin Kadian,
  • John T. Prater,
  • Tatyana I. Smirnova,
  • Alex I. Smirnov,
  • Roger J. Narayan,
  • Jagdish Narayan

摘要

Herein, we report detailed magnetic characteristics of 10-nm thick Q-carbon films grown over a large area. Following the Bloch spin wave theory, we show that Q-carbon exhibits robust room-temperature ferromagnetism with a surprisingly high Curie temperature of ~ 556 K. The square-root dependence of coercivity on temperature indicates homogeneous magnetic interactions in the sample. Finally, through ferromagnetic resonance spectroscopy measurements, we show that the spin interactions in Q-carbon are strong and intrinsic to the system. We envisage that the intrinsic ferromagnetism in Q-carbon opens a new frontier for carbon-based systems in spintronic devices.

Graphical abstract