Journal Article

PreJuSER-16639

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Local ordering and magnetism in Ga0.9Fe3.1N

Burghaus, J. ; Sougrati, M. T. ; Möchel, A.FZJ* ; Houben, A. ; Hermann, R.FZJ* ; Dronskowski, R.

2011
Academic Press Orlando, Fla.

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Please use a persistent id in citations: doi:10.1016/j.jssc.2011.06.031

Abstract: Prior investigations of the ternary nitride series Ga1-xFe3+xN (0 <= x <= 1) have indicated a transition from ferromagnetic gamma'-Fe4N to antiferromagnetic "GaFe3N". The ternary nitride "GaFe3N" has been magnetically and spectroscopically reinvestigated in order to explore the weakening of the ferromagnetic interactions through the gradual incorporation of gallium into gamma'-Fe4N. A hysteretic loop at RI reveals the presence of a minority phase of only 0.1-0.2 at%, in accord with the sound two-step synthesis. The composition of the gallium-richest phase "GaFe3N" was clarified by Prompt Gamma-ray Activation Analysis and leads to the berthollide formula Ga0.91(1)Fe3.09(10)N1.05(7). Magnetic measurements indicate a transition around 8 K, further supported by Mossbauer spectral data. The weakening of the ferromagnetic coupling through an increasing gallium concentration is explained by a simple Stoner argument. In Ga0.9Fe3.1N, the presence of iron on the gallium site affects the magnetism by the formation of 13-atom iron clusters. (C) 2011 Elsevier Inc. All rights reserved.

Keyword(s): J ; Nitride (auto) ; Magnetism (auto) ; Chemical synthesis (auto) ; Mossbauer spectroscopy (auto) ; Stoner criterion (auto)

Note: The FRM II is acknowledged for providing neutron beamtime on PGAA, and Lea Canella is acknowledged for assistance during the data acquisition. RH acknowledges support from the Helmholtz-University Young Investigator Group "Lattice Dynamics in Emerging Functional Materials". We also thank DFG for having funded this study.

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Contributing Institute(s):

1. Streumethoden (PGI-4)
2. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)
3. Streumethoden (JCNS-2)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)
2. Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) (P55)

Experiment(s):

1. PGAA: Prompt gamma activation analysis (NL4b)

Appears in the scientific report 2011

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