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Coherent spin exchange scattering of low-energy electrons by Ni2+ ions in antiferromagnetic crystal NiO under surface wave resonance: experimental and theoretical results revisited

  • Regular Article – Atomic and Molecular Collisions
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Abstract

In this report, we revisit coherent spin exchange scattering experiments with low-energy electrons by Ni2+ ions in antiferromagnetic (AF) crystal NiO. The use of the advanced low-energy electron diffraction (LEED) technique for surface analysis enables more quantitative characterization of surface atoms of Ni2+ ions based on (1) the energy dependence of LEED for “half-order beam” intensity, i.e., the I–V curve, and (2) the temperature dependence at the intensity maximum of 31 eV. In the I–V curve, resonance enhancement is clearly observed, which corresponds to a surface wave resonance (SWR) effect. Under SWR conditions, i.e., the emergence of diffracted beams propagating nearly parallel to the crystal surface, the surface-spin structure properties are investigated through the low-temperature range where the saturation phenomenon can be confirmed. Those energy dependences are also calculated by the relativistic multiple-scattering method, and the temperature dependence is compared with a molecular field model.

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Data Availability Statement

The manuscript has no associated data, or the data will not be deposited. [Authors’ comment: All our data are available from the corresponding author on reasonable request.].

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Acknowledgements

We thank the late Prof. M. J. Brunger for evoking the theme of revising with old memories at Adelaide in this memorial issue. In fact, the theme itself is by no means old; and rather, it may still be one of the foundational and contemporary subjects. Bottom-up technology requires processing control at the atomic and molecular levels. Among them, electron interaction phenomena based on Pauli's principle are the most essential of spintronics. Finally, we are deeply grateful to Dr. E. Tamura for his guidance in LEED calculations, and to the authors, including him, who presented some of our data revisited here at conferences.

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  1. Department of Physics, Sophia University, Tokyo, 102-8554, Japan

    Masamitus Hoshino & Hiroshi Tanaka

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  1. Masamitus Hoshino
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Correspondence to Masamitus Hoshino.

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Guest editors: Márcio Henrique Franco Bettega, Stephen Buckman, Dragana Maric, Sylwia Ptasinska, Ron White.

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Hoshino, M., Tanaka, H. Coherent spin exchange scattering of low-energy electrons by Ni2+ ions in antiferromagnetic crystal NiO under surface wave resonance: experimental and theoretical results revisited. Eur. Phys. J. D 77, 207 (2023). https://doi.org/10.1140/epjd/s10053-023-00773-8

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