Magnetic structure of DyN

a 161Dy Mössbauer study

Jacob P. Evans*, Glen A. Stewart, J. M. Cadogan, Wayne D. Hutchison, Emma E. Mitchell, James E. Downes

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

Conventional magnetometry yields a low temperature bulk magnetic moment of about 4μB/Dy3+ in an applied field of μ0H =9 T for thin and thick dysprosium nitride (DyN) films. This is significantly lower than the maximum possible value of 10 μB/Dy3+. Ion-assisted deposition was used to grow 5.7-μm-thick rare earth nitride DyN films on organic Kapton® substrates. 161Dy Mössbauer spectroscopy (with its time scale on the order of nanoseconds) indicates thermal relaxation between fully stretched ±10μB levels of a low-lying Kramers doublet, which is inconsistent with the Dy3+ site's ideal cubic symmetry. However, a small tetragonal distortion [ϵ ≈ -0.024(10)] observed using x-ray powder diffraction is compatible with an additional rank 2 crystal field term, B02 ≈ -1.0(4)K, approaching the magnitude estimated to bring this about. The observed magnetic behavior can then be described using a two-level, molecular field model with θC set to ≈6-8K, which is substantially smaller than the accepted ordering temperature of TC≈17-26K.

Original languageEnglish
Article number054431
Pages (from-to)1-9
Number of pages9
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume95
Issue number5
DOIs
Publication statusPublished - 2017

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    Evans, J. P., Stewart, G. A., Cadogan, J. M., Hutchison, W. D., Mitchell, E. E., & Downes, J. E. (2017). Magnetic structure of DyN: a 161Dy Mössbauer study. Physical Review B: Condensed Matter and Materials Physics, 95(5), 1-9. [054431]. https://doi.org/10.1103/PhysRevB.95.054431