Magnetic proximity effects at a ferrite―5d-metal interface: GGA+U calculations

0574281 - FZÚ 2024 RIV US eng J - Journal Article
Knížek, Karel - Jirák, Zdeněk
Magnetic proximity effects at a ferrite―5d-metal interface: GGA+U calculations.
Physical Review B. Roč. 108, č. 3 (2023), č. článku 035145. ISSN 2469-9950. E-ISSN 2469-9969
R&D Projects: GA ČR(CZ) GA19-06433S
Research Infrastructure: e-INFRA CZ II - 90254
Institutional support: RVO:68378271
Keywords : ferrimagnets * magnetic coupling * electronic structure
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.7, year: 2022
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevB.108.035145

We have studied spin polarization due to proximity effect at the interface of nonmagnetic 5d metal (Me = Ta, W, Re, Os, Ir, Pt, and Au) and ferrimagnetic conducting (mixed-valence) magnetite Fe3O4 or insulating maghemite γ−Fe2O3 using ab initio electronic structure calculations. Four variants of chemical bonding at the interfaces have been modeled. It appears that the moments induced are oriented according to spin orientation of Fe ions to which Me atoms are bonded-parallel for the direct Fe-Me exchange path and antiparallel for the Fe-O-Me superexchange. The obtained densities of states show that notable spin polarization occurs only for Me atomic plane at very vicinity of the interface with the ferrite.
Permanent Link: https://hdl.handle.net/11104/0344626