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
Artikel, Bibliographie
Kurzbeschreibung (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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2015 |
| Autor(en): | Dirba, Imants ; Komissinskiy, Philipp ; Gutfleisch, Oliver ; Alff, Lambert |
| Art des Eintrags: | Bibliographie |
| Titel: | Increased magnetic moment induced by lattice expansion from α-Fe to α′-Fe8N |
| Sprache: | Englisch |
| Publikationsjahr: | 7 Mai 2015 |
| Verlag: | AIP Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Applied Physics |
| Jahrgang/Volume einer Zeitschrift: | 117 |
| (Heft-)Nummer: | 17 |
| DOI: | 10.1063/1.4919601 |
| Kurzbeschreibung (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. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Dünne Schichten 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 02 Jul 2015 12:34 |
| Letzte Änderung: | 02 Jul 2015 12:34 |
| PPN: | |
| Sponsoren: | 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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