Principal interactions in the magnetic system Fe1−xCoxSi: Magnetic structure and critical temperature by neutron diffraction and SQUID measurements

S. V. Grigoriev; S. V. Maleyev; V. A. Dyadkin; D. Menzel; J. Schoenes; H. Eckerlebe

doi:10.1103/PhysRevB.76.092407

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Principal interactions in the magnetic system Fe1−xCoxSi: Magnetic structure and critical temperature by neutron diffraction and SQUID measurements

S. V. Grigoriev, S. V. Maleyev, V. A. Dyadkin, D. Menzel, J. Schoenes, H. Eckerlebe

DOI 10.1103/PhysRevB.76.092407 · Physical Review B

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Abstract

The compound Fe1−xCoxSi is a good representative for a cubic magnet with Dzyaloshinskii-Moriya interaction. On the basis of the neutron diffraction and superconducting quantum interference device measurements, we built the H−T phase diagram for the compound with different x from 0.1 to 0.7. The same set of parameters governs the magnetic system for different x. These parameters are well interpreted in the framework of the recently developed theory [S. V. Maleyev, Phys. Rev. B 73, 174402 (2006)]. As a result, the spin-wave stiffness, the Dzyaloshinskii constant, the anisotropic exchange constant, and the spin-wave gap caused by the Dzyaloshinskii interaction have been obtained and plotted as a function of x. The changes of the magnetic structure with x can be well interpreted on the basis of our findings.