Exchange interactions and Curie temperatures of the tetrametal nitrides Cr4N, Mn4N, Fe4N, Co4N, and Ni4N

Abstract

The exchange interactions of Cr4N, Mn4N, Fe4N, Co4N, and Ni4N compounds with perovskite structure were calculated to obtain the Curie temperatures for these compounds from Monte Carlo calculations. Contrary to naive expectation, the exchange interactions vary markedly among these five compounds. In Fe4N, the intra-sublattice interaction of the Fe 3c atoms is strongly negative, leading to a significant reduction of the Curie temperature. The calculated Curie temperatures are 291K (Cr4N), 710K (Mn4N), 668K (Fe4N), 827K (Co4N), and 121K (Ni4N), in good agreement with experimental observations where available. The much lower Curie temperature of Ni4N compared to fcc Ni is explained on the basis of the exchange interactions.

11 pages, 3 figures

References in corpus (2)

• A theoretical analysis on highly spin-polarized transport of iron nitride Fe_4N
• Large exchange bias in polycrystalline MnN/CoFe bilayers at room temperature

Cited by in corpus (6)

• Current-driven domain wall dynamics in ferrimagnetic Ni-doped Mn4N films : very large domain wall velocities and reversal of motion direction across the magnetic compensation point
• Finding pathways for stoichiometric Co4N thin films
• Influence of interface and microstructure on magnetization of epitaxial Fe4N thin film
• Electronic structure and magnetic ordering of NiN and Ni${}_2$N from first principles
• Interfacial Mixing Effect in a Promising Skyrmionic Material: Ferrimagnetic Mn${}_4$N
• (Fe,Sn)4N alloy as a model spin-glass system with short-range competing interactions on a nonfrustrated simple cubic lattice