COMPETING ANISOTROPIES IN AF CONICAL Mn1-xMxWO4 MULTIFERROICS
MnWO4 is regarded as a reference spin-induced multiferroics, with the antisymmetric Dzyaloshinskii-Moriya (D-M) interaction governing the polar distortions. In Mn1-xCoxWO4, isotropic Mn2+-Mn2+ exchange interactions compete with the uniaxial Co magnetic anisotropy giving rise to a rich variety of magnetic phases that we have studied in detail in recent years. Of special interest is the stabilization of an AFM conical structure composed of a COM plus an ICOM modulations. Interestingly, for Co2+ the strong uniaxial magnetocrystalline anisotropy is almost perfectly perpendicular to the easy plane of Mn moments in Mn1-xCoxWO4 (where spiral ICOM order develops). So, the response of the ferroelectric conical phase to external magnetic fields along the easy and hard spin directions is being thoroughly investigated in different Mn-CoWO4 systems. But this geometry may be very different using other magnetic metals such as Ni2+ and Fe2+ instead of Co2+, for which the expected magnetic anisotropy is not perpendicular to the easy plane orientation of Mn2+ spins.
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Jose Luis Garcia-Muņoz; CUELLO Gabriel; FAUTH Francois; HERRERO MARTIN Javier; PADILLA Jessica; RITTER Clemens; Arnau Romaguera; SKUMRYEV Vassil and ZHANG XIAODONG. (2018). COMPETING ANISOTROPIES IN AF CONICAL Mn1-xMxWO4 MULTIFERROICS. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2549
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