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Increased magnetic moment induced by lattice expansion from α-Fe to α′-Fe8N

Dirba, Imants and Komissinskiy, Philipp and Gutfleisch, Oliver and Alff, Lambert (2015):
Increased magnetic moment induced by lattice expansion from α-Fe to α′-Fe8N.
117, In: Journal of Applied Physics, (17), AIP Publishing, p. 173911, ISSN 0021-8979, [Online-Edition: http://dx.doi.org/10.1063/1.4919601],
[Article]

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 and Komissinskiy, Philipp and Gutfleisch, Oliver and Alff, Lambert
Title: Increased magnetic moment induced by lattice expansion from α-Fe to α′-Fe8N
Language: English
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.

Journal or Publication Title: Journal of Applied Physics
Volume: 117
Number: 17
Publisher: AIP Publishing
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
Official URL: http://dx.doi.org/10.1063/1.4919601
Identification Number: doi:10.1063/1.4919601
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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