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. 2009 Jan 23;102(3):037204.
doi: 10.1103/PhysRevLett.102.037204. Epub 2009 Jan 22.

Crystal handedness and spin helix chirality in Fe1-xCoxSi

S V Grigoriev  1 , D Chernyshov, V A Dyadkin, V Dmitriev, S V Maleyev, E V Moskvin, D Menzel, J Schoenes, H Eckerlebe
Affiliations

Crystal handedness and spin helix chirality in Fe1-xCoxSi

S V Grigoriev et al. Phys Rev Lett. .

Abstract

We show, with the help of polarized neutrons, that the cubic magnets Fe1-xCoxSi with Dzyaloshinskii-Moriya interaction can be switched between left (for x=0.1, 0.15) and right (for x=0.2, 0.25, 0.3, 0.5) chiral states of the spin helix. The absolute structure was evaluated using x-ray diffraction. The crystals are shown to be enantiopure and the structural chirality changes from right handed for x<0.2 to left handed for x>0.2. These compounds are compared with the etalon sample of MnSi which is identified as having the left-handed chirality both in the magnetic and crystallographic sense.

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