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Abstract <p>We show that polycrystalline thin (5–30 nm thick) Dy films grown on sapphire substrates with a 5&#xa0;nm Ta buffer layer demonstrate a clear IR radiation transmission minimum (or absorption peak) at a frequency corresponding to spin-flip transitions of conduction electrons. This peak vanishes for temperature above roughly 165 K which shows that this is the Néel temperature for our films. The corresponding constant of <i>s–f</i> exchange coupling is determined to be equal to 0.202 eV that is close to that for bulk holmium crystal (0.185 eV), and the spin relaxation time 5.2 × 10<sup>–13</sup> s that is of an order of value greater than that for bulk holmium crystal determined from similar experiment. Observed temperature dependence of the absorption peak may be explained by the temperature dependence of the spiral period in Dy.</p>

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Experimental Evidence of IR Radiation Absorption Due to Spin-Flip Transitions in a Helical Ferromagnet

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • E. A. Karashtin,
  • N. S. Gusev,
  • D. I. Kuritsyn,
  • L. I. Naumova

摘要

Abstract

We show that polycrystalline thin (5–30 nm thick) Dy films grown on sapphire substrates with a 5 nm Ta buffer layer demonstrate a clear IR radiation transmission minimum (or absorption peak) at a frequency corresponding to spin-flip transitions of conduction electrons. This peak vanishes for temperature above roughly 165 K which shows that this is the Néel temperature for our films. The corresponding constant of s–f exchange coupling is determined to be equal to 0.202 eV that is close to that for bulk holmium crystal (0.185 eV), and the spin relaxation time 5.2 × 10–13 s that is of an order of value greater than that for bulk holmium crystal determined from similar experiment. Observed temperature dependence of the absorption peak may be explained by the temperature dependence of the spiral period in Dy.