Dimensionality tuning of the electronic structure in Fe3Ga4 magnetic materials.
K.O. Moura,L.A.S. de Oliveira,Priscila Rosa,C. B. R. Jesus,M. E. Saleta,Eduardo Granado,Fanny Béron,P. G. Pagliuso,Kleber R. Pirota +8 more
TLDR
The results show that reducing the Fe3Ga4 dimensionality, via nanowire shape, intriguingly modifies its electronic structure, and opens a new route to optimize the use of such materials in nanostructured devices.Abstract:
This work reports on the dimensionality effects on the magnetic behavior of Fe3Ga4 compounds by means of magnetic susceptibility, electrical resistivity and specific heat measurements. Our results show that reducing the Fe3Ga4 dimensionality, via nanowire shape, intriguingly modifies its electronic structure. In particular, the bulk system exhibits two transitions, a ferromagnetic (FM) transition temperature at T1 = 50 K and an antiferromagnetic (AFM) one at T2 = 390 K. On the other hand, nanowires shift these transition temperatures, towards higher and lower temperature for T1 and T2, respectively. Moreover, the dimensionality reduction seems to also modify the microscopic nature of the T1 transition. Instead of a FM to AFM transition, as observed in the 3D system, a transition from FM to ferrimagnetic (FERRI) or to coexistence of FM and AFM phases is found for the nanowires. Our results allowed us to propose the magnetic field-temperature phase diagram for Fe3Ga4 in both bulk and nanostructured forms. The interesting microscopic tuning of the magnetic interactions induced by dimensionality in Fe3Ga4 opens a new route to optimize the use of such materials in nanostructured devices.read more
Citations
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Pseudo-monocrystalline properties of cylindrical nanowires confinedly grown by electrodeposition in nanoporous alumina templates
Enrique Díaz Barriga-Castro,Javier García,Raquel Mendoza-Reséndez,Victor M. Prida,Carlos Luna +4 more
TL;DR: In this paper, four cylindrical nanowire systems (nickel, cobalt, Co23Cu77, and multisegmented Co58Ni42/Co83Ni17 nanowires) with single-crystal-like properties were characterized by transmission electron microscopy and selected-area electron diffraction (SAED) under different tilting angles.
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Superconducting Properties in Arrays of Nanostructured β-Gallium.
K.O. Moura,Kleber R. Pirota,Fanny Béron,C. B. R. Jesus,Priscila Rosa,Priscila Rosa,Dina Tobia,P. G. Pagliuso,O. F. de Lima +8 more
TL;DR: Samples of nanostructured β-Ga wires synthesized by a novel method of metallic-flux nanonucleation revealed the stabilization of a weak-coupling type-II-like superconductor, which contrasts the type-I superconductivity observed for the majority of Ga phases.
Journal ArticleDOI
Effect of annealing on the electrical and magnetic properties of electrodeposited Ni and permalloy nanowires
TL;DR: In this paper, the influence of annealing on the microstructure and the electrical and magnetic properties of cylindrical nickel-based nanowires has been investigated, and the results showed a temperature-correlated grain growth of an initially nanocrystalline structure (untreated) with heat-treatment.
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Spontaneous Ga whisker formation on FeGa3
TL;DR: In this article, a newly proposed catalysis-based mechanism, in which the cleavage planes of FeGa3 grains act as heterogeneous nucleation sites and the elemental Ga provides Ga atoms for whisker formation, is employed to explain the spontaneous Ga whiskers formation.
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Highly Doped Si Single Crystal Nanowires via Metallic Flux Nanonucleation
Raul B. Campanelli,Marcos Vinicius Puydinger dos Santos,Alexsandro S. E. da Cruz,Kleber R. Pirota,Fanny Béron +4 more
TL;DR: In this paper, a single-step fabrication of Ga-doped Si bulk and nanowire single crystals was reported, where a nanoporous alumina template was employed to define the nanowires morphology, while Ga was used as flux to both lower the Si melting point and dope the crystals.
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