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Evidence of tetragonal distortion as the origin of the ferromagnetic ground state in γ -Fe nanoparticles
Authors
JP Araújo
Valérie Augustyns
+19 more
D Banerjee
JG Correia
ARG Costa
Tiago de Lemos Lima
HP Gunnlaugsson
J Hadermann
Vincent Joly
F Kremer
Gertjan Lippertz
Enric Menéndez Dalmau
Lino Pereira
Kristiaan Temst
Maarten Trekels
Margriet Van Bael
Koen van Stiphout
André Vantomme
I Vickridge
J von Bardeleben
U Wahl
Publication date
11 July 2017
Publisher
'American Physical Society (APS)'
Doi
Cite
Abstract
© 2017 American Physical Society. γ-Fe and related alloys are model systems of the coupling between structure and magnetism in solids. Since different electronic states (with different volumes and magnetic ordering states) are closely spaced in energy, small perturbations can alter which one is the actual ground state. Here, we demonstrate that the ferromagnetic state of γ-Fe nanoparticles is associated with a tetragonal distortion of the fcc structure. Combining a wide range of complementary experimental techniques, including low-temperature Mössbauer spectroscopy, advanced transmission electron microscopy, and synchrotron radiation techniques, we unambiguously identify the tetragonally distorted ferromagnetic ground state, with lattice parameters a=3.76(2)Å and c=3.50(2)Å, and a magnetic moment of 2.45(5) μB per Fe atom. Our findings indicate that the ferromagnetic order in nanostructured γ-Fe is generally associated with a tetragonal distortion. This observation motivates a theoretical reassessment of the electronic structure of γ-Fe taking tetragonal distortion into account.status: publishe
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Last time updated on 10/12/2019