Dirba, Imants ; Komissinskiy, Philipp ; Gutfleisch, Oliver ; Alff, Lambert (2015)
Increased magnetic moment induced by lattice expansion from α-Fe to α′-Fe8N.
In: Journal of Applied Physics, 117 (17)
doi: 10.1063/1.4919601
Article, Bibliographie
Abstract
Buffer-free and epitaxial α-Fe and α' -Fe8N x thin films have been grown by RF magnetron sputtering onto MgO (100) substrates. The film thicknesses were determined with high accuracy by evaluating the Kiessig fringes of X-ray reflectometry measurements allowing a precise volume estimation. A gradual increase of the nitrogen content in the plasma led to an expansion of the iron bcc unit cell along the [001] direction resulting finally in a tetragonal distortion of about 10% corresponding to the formation of α' -Fe8N. The α-Fe lattice expansion was accompanied by an increase in magnetic moment to 2.61 ± 0.06μ B per Fe atom and a considerable increase in anisotropy. These experiments show that—without requiring any additional ordering of the nitrogen atoms—the lattice expansion of α-Fe itself is the origin of the increased magnetic moment in α' -Fe8N.
| Item Type: | Article |
|---|---|
| Erschienen: | 2015 |
| Creators: | Dirba, Imants ; Komissinskiy, Philipp ; Gutfleisch, Oliver ; Alff, Lambert |
| Type of entry: | Bibliographie |
| Title: | Increased magnetic moment induced by lattice expansion from α-Fe to α′-Fe8N |
| Language: | English |
| Date: | 7 May 2015 |
| Publisher: | AIP Publishing |
| Journal or Publication Title: | Journal of Applied Physics |
| Volume of the journal: | 117 |
| Issue Number: | 17 |
| DOI: | 10.1063/1.4919601 |
| Abstract: | Buffer-free and epitaxial α-Fe and α' -Fe8N x thin films have been grown by RF magnetron sputtering onto MgO (100) substrates. The film thicknesses were determined with high accuracy by evaluating the Kiessig fringes of X-ray reflectometry measurements allowing a precise volume estimation. A gradual increase of the nitrogen content in the plasma led to an expansion of the iron bcc unit cell along the [001] direction resulting finally in a tetragonal distortion of about 10% corresponding to the formation of α' -Fe8N. The α-Fe lattice expansion was accompanied by an increase in magnetic moment to 2.61 ± 0.06μ B per Fe atom and a considerable increase in anisotropy. These experiments show that—without requiring any additional ordering of the nitrogen atoms—the lattice expansion of α-Fe itself is the origin of the increased magnetic moment in α' -Fe8N. |
| Divisions: | 11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology 11 Department of Materials and Earth Sciences > Material Science > Functional Materials 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences |
| Date Deposited: | 02 Jul 2015 12:34 |
| Last Modified: | 02 Jul 2015 12:34 |
| PPN: | |
| Funders: | I.D. thanks the BMBF for the financial support within the Project No. 03X3582., The authors thank the LOEWE project RESPONSE funded by the Ministry of Higher Education, Research and the Arts (HMWK) of the Hessen state. |
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