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Abstract <p>The structural and hysteresis properties of epitaxial MgO(100)/<sup>57</sup>Fe(50 nm)/Cr(2 nm) films grown by molecular beam epitaxy (MBE) were investigated. Changes in structural properties during annealing in the temperature range of 200–300°C were studied using X-ray diffraction, Raman spectroscopy, atomic force microscopy and Mössbauer spectroscopy. It was shown that at temperatures above 250°C, oxygen diffusion through the protective Cr layer occurs, leading to the formation of antiferromagnetic α-Fe<sub>2</sub>O<sub>3</sub> oxide. The temperature dependences of hysteresis properties during annealing were determined. At an annealing temperature of 280°C, the coercive force reaches a maximum value of 190 Oe. The absence of exchange bias, evidenced by zero shift in the hysteresis loops, suggests the dominant role of low magnetic anisotropy of α-Fe<sub>2</sub>O<sub>3</sub> and interface disorder in these oxidized heterostructures.</p>

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Structural and Hysteretic Properties of Oxidized Epitaxial MgO(100)/57Fe/Cr Films

  • 期刊论文

  • 发表日期：

    2025年12月8日

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  • I. V. Blinov,
  • M. A. Milyaev,
  • Yu. V. Korkh,
  • T. V. Kuznetsova,
  • D. I. Devyaterikov,
  • A. Yu. Germov,
  • B. Yu. Goloborodsky,
  • R. M. Falahutdinov,
  • E. V. Osinnikov

摘要

Abstract

The structural and hysteresis properties of epitaxial MgO(100)/57Fe(50 nm)/Cr(2 nm) films grown by molecular beam epitaxy (MBE) were investigated. Changes in structural properties during annealing in the temperature range of 200–300°C were studied using X-ray diffraction, Raman spectroscopy, atomic force microscopy and Mössbauer spectroscopy. It was shown that at temperatures above 250°C, oxygen diffusion through the protective Cr layer occurs, leading to the formation of antiferromagnetic α-Fe2O3 oxide. The temperature dependences of hysteresis properties during annealing were determined. At an annealing temperature of 280°C, the coercive force reaches a maximum value of 190 Oe. The absence of exchange bias, evidenced by zero shift in the hysteresis loops, suggests the dominant role of low magnetic anisotropy of α-Fe2O3 and interface disorder in these oxidized heterostructures.