Dimensionality tuning of the electronic structure in Fe3Ga4 magnetic materials

作者：Moura K O^*; de Oliveira L A S; Rosa P F S; Jesus C B R; Saleta M E; Granado E; Beron F; Pagliuso P G; Pirota K R

来源：Scientific Reports, 2016, 6(1): 28364.

DOI：10.1038/srep28364

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 T-1 = 50 K and an antiferromagnetic (AFM) one at T-2 = 390 K. On the other hand, nanowires shift these transition temperatures, towards higher and lower temperature for T-1 and T-2, respectively. Moreover, the dimensionality reduction seems to also modify the microscopic nature of the T-1 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.

• 出版日期2016-6-22