Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.84: Poster

Dienstag, 13. März 2018, 09:30–13:00, Poster A

Size effect of exchange interaction parameters for FePd nanoparticles — •Svitlana Ponomarova, Iurii Koval, and Oleksandr Ponomarov — Institute for Metal Physics the NAS of Ukraine

Magnetic properties of materials are measured by various types of external influences. From this prospective FePd bulk and nano alloys show interesting features: increase of high magnetic anisotropy in the ordered L10 phase, Invar effect, and martensitic transformation at low temperatures.

In this paper we calculated exchange interaction parameters - exchange integrals - in FePd magnetic nanomaterials for Fe-Fe, Pd-Pd, Fe-Pd atom pairs within a nanoparticle under different conditions.

The Heisenberg model for the system of randomly located spins concerning their slowly-relaxing arrangement was updated for binary solid solution with two magnetic components. Magnetic properties (Curie temperature, etc.) may be easily varied by nanoparticle size. For this readon size effect is additional control factor which was taken into consideration for nanoparticles.

Basically we focused on analysis of:

1. the correlation between exchange interaction parameters and characteristics of martensitic transformation;

2. influence of an external pressure and an atomic ordering effect on exchange integrals.