Conductivity of high-mobility epitaxial GdN
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arXiv
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| Format: | Preprint |
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2025
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| author | Trewick, Edward X. M. Ruck, B. J. Holmes-Hewett, W. F. Trodahl, H. J. |
| author_facet | Trewick, Edward X. M. Ruck, B. J. Holmes-Hewett, W. F. Trodahl, H. J. |
| contents | We report electron transport studies of a (001) GdN film grown on the square net presented by the (001) surface of LaAlO3, motivated by recent advances in epitaxial thin-film growth of several lanthanide nitrides. The film we have grown for the purpose is characterised by in-situ RHEED and ex-situ XRD and XRR to show the best crystallinity and smoothest surfaces we have accomplished to date. It shows a clear ferromagnetic transition at $\sim70$ K with a saturation magnetisation within uncertainly of 7 $μ$B/Gd$^{3+}$ ion, a remanence of 5 $μ$B/Gd$^{3+}$ ion and a coercive field of $\sim$5 mT. It is doped by $\sim1$% nitrogen vacancies that introduce $\sim3\times10^{20}$ cm$^{-3}$ electrons into the conduction band. The resistivity shows transport in a conduction band doped to degeneracy by $\sim0.01$ electrons/formula unit with a residual resistance ratio of 2 and a Hall resistivity permitting easily-separated ordinary and anomalous Hall components. The mobility is an order of magnitude larger than we have found in earlier films. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2502_02005 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Conductivity of high-mobility epitaxial GdN Trewick, Edward X. M. Ruck, B. J. Holmes-Hewett, W. F. Trodahl, H. J. Materials Science We report electron transport studies of a (001) GdN film grown on the square net presented by the (001) surface of LaAlO3, motivated by recent advances in epitaxial thin-film growth of several lanthanide nitrides. The film we have grown for the purpose is characterised by in-situ RHEED and ex-situ XRD and XRR to show the best crystallinity and smoothest surfaces we have accomplished to date. It shows a clear ferromagnetic transition at $\sim70$ K with a saturation magnetisation within uncertainly of 7 $μ$B/Gd$^{3+}$ ion, a remanence of 5 $μ$B/Gd$^{3+}$ ion and a coercive field of $\sim$5 mT. It is doped by $\sim1$% nitrogen vacancies that introduce $\sim3\times10^{20}$ cm$^{-3}$ electrons into the conduction band. The resistivity shows transport in a conduction band doped to degeneracy by $\sim0.01$ electrons/formula unit with a residual resistance ratio of 2 and a Hall resistivity permitting easily-separated ordinary and anomalous Hall components. The mobility is an order of magnitude larger than we have found in earlier films. |
| title | Conductivity of high-mobility epitaxial GdN |
| topic | Materials Science |
| url | https://arxiv.org/abs/2502.02005 |