SKM 2023 – scientific programme
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MA: Fachverband Magnetismus
MA 23: Poster Magnetism I
MA 23.29: Poster
Tuesday, March 28, 2023, 17:00–19:00, P1
Methods of electron transport in the theory of spin stiffness — •Ilja Turek1, Josef Kudrnovsky2, and Vaclav Drchal2 — 1Institute of Physics of Materials, Czech Acad. Sci., Brno, Czech Rep. — 2Institute of Physics, Czech Acad. Sci., Prague, Czech Rep.
We present an ab initio theory of the spin-wave stiffness for itinerant ferromagnets [1] with pair exchange interactions derived from the magnetic force theorem [2]. The resulting formula involves one-particle propagators and effective velocity operators appearing in a recent theory of electron transport [3]. Application of this approach to clean crystals allows one to overcome the problem of ill-converging lattice summations, as documented by results for pure metals Fe, Co, and Ni. Application to random alloys within the coherent potential approximation, illustrated by results for fcc Ni-Fe and bcc Fe-Al systems, enables one to include the disorder-induced vertex corrections, often neglected in evaluation of the exchange interactions.
[1] I. Turek et al., Phys. Rev. B 101 (2020) 134410. [2] A. I. Liechtenstein et al., J. Magn. Magn. Mater. 67 (1987) 65. [3] I. Turek et al., Phys. Rev. B 65 (2002) 125101.