Structure of DyFe2/YFe2 Laves phase superlattices grown by molecular beam epitaxy
The crystal structure of a series of six high quality single crystal Laves phase superlattice samples, of structure [t1 ÅDyFe2/t2ÅYFe2]N, grown by molecular beam epitaxy have been probed using a high resolution triple crystal x-ray diffractometer. A study of the scattering near the 2 2 0, 4 4 0 and...
| Autors principals: | , , , |
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| Format: | Journal article |
| Idioma: | English |
| Publicat: |
2003
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| _version_ | 1826263965894705152 |
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| author | Bentall, M Ward, R Grier, E Wells, MR |
| author_facet | Bentall, M Ward, R Grier, E Wells, MR |
| author_sort | Bentall, M |
| collection | OXFORD |
| description | The crystal structure of a series of six high quality single crystal Laves phase superlattice samples, of structure [t1 ÅDyFe2/t2ÅYFe2]N, grown by molecular beam epitaxy have been probed using a high resolution triple crystal x-ray diffractometer. A study of the scattering near the 2 2 0, 4 4 0 and 2 6 2 reflections has revealed the presence of several superlattice peaks, showing that the samples exhibit a high degree of superlattice modulation. The typical mosaic spread is less than 0.9°, while the superlattice coherence lengths are typically 2000 Å. Fitting of a model to the data using a differential evolution algorithm with a Rietveld refinement has confirmed the high quality of these samples and shows that the interface widths are typically ∼20 Å. Measurements of the in-plane and out-of-plane lattice parameters show that the samples are subjected to a shear that is slightly anisotropic in the plane. Transverse scans through the Bragg and superlattice peaks show that the width is mainly dominated by a mosaic crystal effect, with a small contribution arising from the correlated roughness at the bilayer interfaces. Finally, high resolution electron microscopy images show directly that these superlattices exhibit a high degree of modulation. |
| first_indexed | 2024-03-06T20:00:16Z |
| format | Journal article |
| id | oxford-uuid:270f37b1-aedc-4b09-9f3a-0febb1652f1d |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T20:00:16Z |
| publishDate | 2003 |
| record_format | dspace |
| spelling | oxford-uuid:270f37b1-aedc-4b09-9f3a-0febb1652f1d2022-03-26T12:04:34ZStructure of DyFe2/YFe2 Laves phase superlattices grown by molecular beam epitaxyJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:270f37b1-aedc-4b09-9f3a-0febb1652f1dEnglishSymplectic Elements at Oxford2003Bentall, MWard, RGrier, EWells, MRThe crystal structure of a series of six high quality single crystal Laves phase superlattice samples, of structure [t1 ÅDyFe2/t2ÅYFe2]N, grown by molecular beam epitaxy have been probed using a high resolution triple crystal x-ray diffractometer. A study of the scattering near the 2 2 0, 4 4 0 and 2 6 2 reflections has revealed the presence of several superlattice peaks, showing that the samples exhibit a high degree of superlattice modulation. The typical mosaic spread is less than 0.9°, while the superlattice coherence lengths are typically 2000 Å. Fitting of a model to the data using a differential evolution algorithm with a Rietveld refinement has confirmed the high quality of these samples and shows that the interface widths are typically ∼20 Å. Measurements of the in-plane and out-of-plane lattice parameters show that the samples are subjected to a shear that is slightly anisotropic in the plane. Transverse scans through the Bragg and superlattice peaks show that the width is mainly dominated by a mosaic crystal effect, with a small contribution arising from the correlated roughness at the bilayer interfaces. Finally, high resolution electron microscopy images show directly that these superlattices exhibit a high degree of modulation. |
| spellingShingle | Bentall, M Ward, R Grier, E Wells, MR Structure of DyFe2/YFe2 Laves phase superlattices grown by molecular beam epitaxy |
| title | Structure of DyFe2/YFe2 Laves phase superlattices grown by molecular beam epitaxy |
| title_full | Structure of DyFe2/YFe2 Laves phase superlattices grown by molecular beam epitaxy |
| title_fullStr | Structure of DyFe2/YFe2 Laves phase superlattices grown by molecular beam epitaxy |
| title_full_unstemmed | Structure of DyFe2/YFe2 Laves phase superlattices grown by molecular beam epitaxy |
| title_short | Structure of DyFe2/YFe2 Laves phase superlattices grown by molecular beam epitaxy |
| title_sort | structure of dyfe2 yfe2 laves phase superlattices grown by molecular beam epitaxy |
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