A theoretical analysis on highly spin-polarized transport of iron nitride Fe_4N

Abstract

In order to propose a ferromagnet exhibiting highly spin-polarized transport, we theoretically analyzed the spin polarization ratio of the conductivity of the bulk Fe${}_4$N with a perovskite type structure, in which N is located at the body center position of fcc-Fe. The spin polarization ratio is defined by $P=({\sigma }_{\uparrow }-{\sigma }_{\downarrow })/({\sigma }_{\uparrow }+{\sigma }_{\downarrow })$, with ${\sigma }_{\uparrow (\downarrow )}$ being the conductivity at zero temperature of the up spin (down spin). The conductivity is obtained by using the Kubo formula and the Slater-Koster tight binding model, where parameters are determined from the least-square fitting of the dispersion curves by the tight binding model to those by the first principles calculation. In the vicinity of the Fermi energy, $|P|$ takes almost 1.0, indicating perfectly spin-polarized transport. In addition, by comparing Fe${}_4$N to fcc-Fe (Fe${}_4$N${}_0$) in the ferromagnetic state with the equilibrium lattice constant of Fe${}_4$N, it is shown that the non-magnetic atom N plays an important role in increasing $|P|$.

4 pages, 2 figures, accepted for publication in Phys. Rev. B

References in corpus (3)

• Dependence of Giant Tunnel Magnetoresistance of Sputtered CoFeB/MgO/CoFeB Magnetic Tunnel Junctions on MgO Barrier Thickness and Annealing Temperatur
• Dependence of tunnel magnetoresistance in MgO based magnetic tunnel junctions on Ar pressure during MgO sputtering
• Magnetoresistance Effect in Spin-Polarized Junctions of Ferromagnetically Contacting Multiple Conductive Paths: Applications to Atomic Wires and Carbon Nanotubes

Cited by in corpus (15)

• Anisotropic Magnetoresistance Effects in Fe, Co, Ni, Fe_4N, and Half-Metallic Ferromagnet: A Systematic Analysis
• Exchange interactions and Curie temperatures of the tetrametal nitrides Cr4N, Mn4N, Fe4N, Co4N, and Ni4N
• Twofold and Fourfold Symmetric Anisotropic Magnetoresistance Effect in A Model with Crystal Field
• Thickness-dependent electronic and magnetic properties of ${\gamma }^{\prime }$-Fe${}_4$N atomic layers on Cu(001)
• Effect of dopants on thermal stability and self-diffusion in iron nitride thin films
• Finding pathways for stoichiometric Co4N thin films
• Out-of-Plane Magnetic Anisotropy in Ordered Ensembles of Fe${}_y$N Nanocrystals Embedded in GaN
• Planar arrays of magnetic nanocrystals embedded in GaN
• Influence of interface and microstructure on magnetization of epitaxial Fe4N thin film
• Theoretical Study on Four-fold Symmetric Anisotropic Magnetoresistance Effect in Cubic Single-crystal Ferromagnetic Model
• Planar array of self-assembled Ga${}_x$Fe${}_{4-x}$N nanocrystals in GaN: Magnetic anisotropy determined via ferromagnetic resonance
• Fully spin-dependent transport of triangular graphene flakes
• Unravelling the interplay of geometrical, magnetic and electronic properties of metal-doped graphene nanomeshes
• Structural and magnetic properties of co-sputtered Fe0.8C0.2 thin films
• Spin-Atomic Vibration Interaction and Spin-Flip Hamiltonian of a Single Atomic Spin in a Crystal Field