Spin structure in the Ferroelectric Phase of Magnetoelectric Y-typehexaferrite Ba0.6Sr1.4Zn2Fe12O22
In the Y-type hexaferrite Ba0.6Sr1.4Zn2Fe12O22, the observed magnetic field driven ferroelectricity cannot be explained by the proposed fanlike structure. We observed large circular dichroism in soft X-ray diffraction at (0,0,1.5) in horizontal H||ab in the ferroelectric, which implies that the magnetic structure is chiral. In an additional experiment with a vertical field H||ab we observed the same domain pattern with linear dichroism. The chiral domains are not consistent with the proposed fanlike structure but consistent with transverse conical spin structure, which would be consistent with a Dzyaloshinskii-Moriya-type ferroelectric mechanism. However, soft X-ray diffraction does not provide enough experimental constraints to test that model and fix the parameters. Using polarized neutron diffraction we will provide more constrains allowing testing our model and refining the parameters. We can also observe chirality with neutrons, in a half-polarized setup, which will provide additional tests of the model and parameters.
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KHAZARADZE Giorgi; Manuel Angst; SCHMALZL Karin; SCHMIDT Wolfgang F and THAKURIA Pankaj. (2015). Spin structure in the Ferroelectric Phase of Magnetoelectric Y-typehexaferrite Ba0.6Sr1.4Zn2Fe12O22. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-51-512
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