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Exchange integrals of commensurate and incommensurate structures of MFe4Al8 (M = U, Sc)

K. REĆKO1,*

Affiliation

  1. Faculty of Physics, University of Bialystok, K. Ciołkowskiego 1L, 15-245 Białystok, Poland

Abstract

The appearance of the commensurability of UFe4Al8 alloy considering incommensurability of ScFe4Al8 compound is analysed on the basis of Heisenberg Hamiltonian. The influence of Dzyaloshinskii – Moriya and Ruderman-Kittel-Kasuya-Yoshida as well as the dipolar interactions as the main reasons of the noncollinearity and incommensurability of the alloys belonging to ThMn12 family is investigated. The values and directions of the spin ordering found by magnetic diffraction are compared to that one’s deriving from grand state configurations obtained by a simulated annealing algorithm. The lock-in magnetic modulations due to substitution of scandium by uranium atoms is discussed based on an appropriate exchange constants ratios..

Keywords

27.90+b Actinides, 72.80.Ga Transition-metal compounds, 75.30.Et Exchange interactions, 75.30.Gw Magnetic anisotropy.

Submitted at: May 7, 2015
Accepted at: Sept. 9, 2015

Citation

K. REĆKO, Exchange integrals of commensurate and incommensurate structures of MFe4Al8 (M = U, Sc), Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 9-10, pp. 1403-1409 (2015)