First-principles study of magnetic and transport properties in pristine MnBr <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si17.svg" display="inline" id="d1e710"> <mml:msub> <mml:mrow/> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </m

This study investigates the electronic structure, magnetic order, and quantum transport properties of seven distinct MnBr 2 nanoribbons (one armchair and six zigzag) using density functional theory and the non-equilibrium Green’s function formalism. The results show that, for all nanoribbons investigated, the optimized structures become more stable as their width increases, particularly in the antiferromagnetic configuration. Quantum transport simulations demonstrate that the three identified half-metallic nanoribbons conduct a fully spin-polarized current in the spin-up channel, with complete suppression of the spin-down current. These findings underscore the significant potential of MnBr 2 nanoribbons for application in nanoelectronics and nanospintronics. • MnBr 2 nanoribbons electronic, magnetic, and transport Properties. • MnBr 2 nanoribbon applications in nanoelectronic and nanospintronic. • Half-metallic nanoribbons conduct a fully spin-polarized current. • Density functional theory and non-equilibrium Green’s function method.