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Quantitative atomic order characterization of a Mn₂FeAl Heusler epitaxial thin film

Kurdi, Samer ; Sakuraba, Yuya ; Masuda, Keisuke ; Tajiri, Hiroo ; Nair, Bhaskaran ; Nataf, Guillaume F. ; Vickers, Mary E. ; Reiss, Günter ; Meinert, Markus ; Dhesi, Sarnjeet S. ; Ghidini, Massimo ; Barber, Zoe H. (2022):
Quantitative atomic order characterization of a Mn₂FeAl Heusler epitaxial thin film. (Publisher's Version)
In: Journal of Physics D: Applied Physics, 55 (18), IOP Publishing, e-ISSN 1361-6463,
DOI: 10.26083/tuprints-00020639,
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Item Type: Article
Origin: Secondary publication DeepGreen
Status: Publisher's Version
Title: Quantitative atomic order characterization of a Mn₂FeAl Heusler epitaxial thin film
Language: English
Abstract:

In this work, we investigate the effect of anti-site disorder on the half-metallic properties of a Mn₂FeAl Heusler alloy thin film. The film was grown on TiN-buffered MgO 001 substrates via magnetron sputtering. A detailed structural characterization using x-ray diffraction (XRD) and anomalous XRD showed that the film crystallizes in the partially disordered L2₁ B structure with 33% disorder between the Mn(B) and Al(D) sites. We measure a positive anisotropic magnetoresistance in the film, which is an indication of non-half metallic behaviour. Our x-ray magnetic circular dichroism sum rules analysis shows that Mn carries the magnetic moment in the film, with a positive Fe moment. Experimentally determined moments correspond most closely with those found by density functional calculated for the L2₁ B structure with Mn(B) and Al(D) site disorder, matching the experimental structural analysis. We thus attribute the deviation from half-metallic behaviour to the formation of the L2₁ B structure. To realize a half-metallic Mn₂FeAl film it is important that the inverse Heusler XA structure is stabilized with minimal anti-site atomic disorder.

Journal or Publication Title: Journal of Physics D: Applied Physics
Volume of the journal: 55
Issue Number: 18
Place of Publication: Darmstadt
Publisher: IOP Publishing
Collation: 10 Seiten
Uncontrolled Keywords: Heusler alloy, spintronics, x-ray absorption spectroscopy, x-ray diffraction, x-ray magnetic circular dichroism, spin polarization, thin films
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
500 Naturwissenschaften und Mathematik > 540 Chemie
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics (IMP) > New Materials Electronics
Date Deposited: 11 Jul 2022 13:46
Last Modified: 08 Sep 2022 08:40
DOI: 10.26083/tuprints-00020639
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-206397
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20639
PPN: 498971384
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