Unravelling the local crystallographic structure of ferromagnetic $$\gamma '$$ γ ′ - $$\hbox {Ga}_y \hbox {Fe}_{4-y}$$ Ga y Fe 4 - y N nanocrystals embedded in GaN
Abstract In the Fe-doped GaN phase-separated magnetic semiconductor Ga $$\delta $$ δ FeN, the presence of embedded $$\gamma '$$ γ ′ - $$\hbox {Ga}_y \hbox {Fe}_{4-y}$$ Ga y Fe 4 - y N nanocrystals determines the magnetic properties of the system. Here, through a combination of anomalous X-ray d...
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2021
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oai:doaj.org-article:9c3bdd97e2614d10a6452bfa8099a85d2021-12-02T14:06:11ZUnravelling the local crystallographic structure of ferromagnetic $$\gamma '$$ γ ′ - $$\hbox {Ga}_y \hbox {Fe}_{4-y}$$ Ga y Fe 4 - y N nanocrystals embedded in GaN10.1038/s41598-021-82380-42045-2322https://doaj.org/article/9c3bdd97e2614d10a6452bfa8099a85d2021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-82380-4https://doaj.org/toc/2045-2322Abstract In the Fe-doped GaN phase-separated magnetic semiconductor Ga $$\delta $$ δ FeN, the presence of embedded $$\gamma '$$ γ ′ - $$\hbox {Ga}_y \hbox {Fe}_{4-y}$$ Ga y Fe 4 - y N nanocrystals determines the magnetic properties of the system. Here, through a combination of anomalous X-ray diffraction and diffraction anomalous fine structure, the local structure of Ga in self-assembled face-centered cubic (fcc) $$\gamma '$$ γ ′ - $$\hbox {Ga}_y \hbox {Fe}_{4-y}$$ Ga y Fe 4 - y N nanocrystals embedded in wurtzite GaN thin layers is investigated in order to shed light onto the correlation between fabrication parameters, local structural arrangement and overall magnetic properties of the material system. It is found, that by adjusting the growth parameters and thus, the crystallographic surroundings, the Ga atoms can be induced to incorporate into 3c positions at the faces of the fcc crystal lattice, reaching a maximum occupancy of 30%. The magnetic response of the embedded nanocrystals is ferromagnetic with Curie temperature increasing from 450 to 500 K with the Ga occupation. These results demonstrate the outstanding potential of the employed experimental protocol for unravelling the local structure of magnetic multi-phase systems, even when embedded in a matrix containing the same element under investigation.Andrea Navarro-QuezadaKatarzyna GasAnna SpindlbergerFahim KarimiMaciej SawickiGianluca CiattoAlberta BonanniNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021) |
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Medicine R Science Q Andrea Navarro-Quezada Katarzyna Gas Anna Spindlberger Fahim Karimi Maciej Sawicki Gianluca Ciatto Alberta Bonanni Unravelling the local crystallographic structure of ferromagnetic $$\gamma '$$ γ ′ - $$\hbox {Ga}_y \hbox {Fe}_{4-y}$$ Ga y Fe 4 - y N nanocrystals embedded in GaN |
| description |
Abstract In the Fe-doped GaN phase-separated magnetic semiconductor Ga $$\delta $$ δ FeN, the presence of embedded $$\gamma '$$ γ ′ - $$\hbox {Ga}_y \hbox {Fe}_{4-y}$$ Ga y Fe 4 - y N nanocrystals determines the magnetic properties of the system. Here, through a combination of anomalous X-ray diffraction and diffraction anomalous fine structure, the local structure of Ga in self-assembled face-centered cubic (fcc) $$\gamma '$$ γ ′ - $$\hbox {Ga}_y \hbox {Fe}_{4-y}$$ Ga y Fe 4 - y N nanocrystals embedded in wurtzite GaN thin layers is investigated in order to shed light onto the correlation between fabrication parameters, local structural arrangement and overall magnetic properties of the material system. It is found, that by adjusting the growth parameters and thus, the crystallographic surroundings, the Ga atoms can be induced to incorporate into 3c positions at the faces of the fcc crystal lattice, reaching a maximum occupancy of 30%. The magnetic response of the embedded nanocrystals is ferromagnetic with Curie temperature increasing from 450 to 500 K with the Ga occupation. These results demonstrate the outstanding potential of the employed experimental protocol for unravelling the local structure of magnetic multi-phase systems, even when embedded in a matrix containing the same element under investigation. |
| format |
article |
| author |
Andrea Navarro-Quezada Katarzyna Gas Anna Spindlberger Fahim Karimi Maciej Sawicki Gianluca Ciatto Alberta Bonanni |
| author_facet |
Andrea Navarro-Quezada Katarzyna Gas Anna Spindlberger Fahim Karimi Maciej Sawicki Gianluca Ciatto Alberta Bonanni |
| author_sort |
Andrea Navarro-Quezada |
| title |
Unravelling the local crystallographic structure of ferromagnetic $$\gamma '$$ γ ′ - $$\hbox {Ga}_y \hbox {Fe}_{4-y}$$ Ga y Fe 4 - y N nanocrystals embedded in GaN |
| title_short |
Unravelling the local crystallographic structure of ferromagnetic $$\gamma '$$ γ ′ - $$\hbox {Ga}_y \hbox {Fe}_{4-y}$$ Ga y Fe 4 - y N nanocrystals embedded in GaN |
| title_full |
Unravelling the local crystallographic structure of ferromagnetic $$\gamma '$$ γ ′ - $$\hbox {Ga}_y \hbox {Fe}_{4-y}$$ Ga y Fe 4 - y N nanocrystals embedded in GaN |
| title_fullStr |
Unravelling the local crystallographic structure of ferromagnetic $$\gamma '$$ γ ′ - $$\hbox {Ga}_y \hbox {Fe}_{4-y}$$ Ga y Fe 4 - y N nanocrystals embedded in GaN |
| title_full_unstemmed |
Unravelling the local crystallographic structure of ferromagnetic $$\gamma '$$ γ ′ - $$\hbox {Ga}_y \hbox {Fe}_{4-y}$$ Ga y Fe 4 - y N nanocrystals embedded in GaN |
| title_sort |
unravelling the local crystallographic structure of ferromagnetic $$\gamma '$$ γ ′ - $$\hbox {ga}_y \hbox {fe}_{4-y}$$ ga y fe 4 - y n nanocrystals embedded in gan |
| publisher |
Nature Portfolio |
| publishDate |
2021 |
| url |
https://doaj.org/article/9c3bdd97e2614d10a6452bfa8099a85d |
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