By means of ab initio calculations, including spin-restricted Born-Oppenheimer molecular dynamics at finite vibrational temperature, we investigate the magnetic behaviour of Al, AlNi and AlPt nanoparticles of 19 atoms. Starting from a poly-icosahedron, we observe that the 5-fold symmetry axis is usually preserved at 100 K, but a few dynamical structural transformations take place towards three new architectures characterized by a different piling of the pentagon rings around the 5-fold axis. Other shapes, such as the interplay of an octahedron to an icosahedron, could be detected although less frequently. Notwithstanding a ferromagnetic behaviour is observed independently of shapes and chemical compositions, a depletion of the total magnetisation occurs when the surface is delimited by (100) facets, or by distorted (100) facets, associated with the appearance of an antiferromagnetic ordering.

Interdependence of shape and magnetic properties in Al-nanoparticles doped with Ni and Pt / O. Lopez-Estrada, E. Orgaz, F. Baletto. - In: JOURNAL OF MATERIALS CHEMISTRY. C. - ISSN 2050-7534. - 8:7(2020), pp. 2533-2541. [10.1039/c9tc04013g]

Interdependence of shape and magnetic properties in Al-nanoparticles doped with Ni and Pt

F. Baletto
2020

Abstract

By means of ab initio calculations, including spin-restricted Born-Oppenheimer molecular dynamics at finite vibrational temperature, we investigate the magnetic behaviour of Al, AlNi and AlPt nanoparticles of 19 atoms. Starting from a poly-icosahedron, we observe that the 5-fold symmetry axis is usually preserved at 100 K, but a few dynamical structural transformations take place towards three new architectures characterized by a different piling of the pentagon rings around the 5-fold axis. Other shapes, such as the interplay of an octahedron to an icosahedron, could be detected although less frequently. Notwithstanding a ferromagnetic behaviour is observed independently of shapes and chemical compositions, a depletion of the total magnetisation occurs when the surface is delimited by (100) facets, or by distorted (100) facets, associated with the appearance of an antiferromagnetic ordering.
Settore FIS/03 - Fisica della Materia
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/865002
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