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<p>The magnetization of a series of samples containing ε-Fe<sub>2</sub>O<sub>3</sub> nanoparticles of different average sizes (approximately 4‒11&#xa0;nm) has been measured in the temperature range of 300–550&#xa0;K, which includes the region of a high-temperature magnetic transition. The observed Néel temperature drop has been attributed to the manifestation of the size effect: from ~ 500&#xa0;K for fairly coarse (&gt; 10&#xa0;nm) particles to ~ 450&#xa0;K for particles of ~ 5&#xa0;nm in size. The obtained particle size dependence of the Néel temperature has been analyzed within the scaling law for critical phenomena in finite-size systems.</p>

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Size Effect and Temperature of Magnetic Ordering in ε-Fe2O3 Nanoparticles

  • 期刊论文

  • 发表日期：

    2025年7月18日

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  • D. A. Balaev,
  • S. V. Semenov,
  • A. A. Dubrovskiy,
  • Yu. V. Knyazev,
  • V. L. Kirillov,
  • K. A. Shaykhutdinov,
  • O. N. Martyanov

摘要

The magnetization of a series of samples containing ε-Fe2O3 nanoparticles of different average sizes (approximately 4‒11 nm) has been measured in the temperature range of 300–550 K, which includes the region of a high-temperature magnetic transition. The observed Néel temperature drop has been attributed to the manifestation of the size effect: from ~ 500 K for fairly coarse (> 10 nm) particles to ~ 450 K for particles of ~ 5 nm in size. The obtained particle size dependence of the Néel temperature has been analyzed within the scaling law for critical phenomena in finite-size systems.