The modulated magnetic structure of α-Fe2O3: Ga weak ferromagnet
Z. T. AzamatovTashkent State University, Universitetskaya ul. 95, Vuzgorodok, Tashkent, 700095, UzbekistanA. A. KaraevTashkent State University, Universitetskaya ul. 95, Vuzgorodok, Tashkent, 700095, UzbekistanB. Yu. SokolovTashkent State University, Universitetskaya ul. 95, Vuzgorodok, Tashkent, 700095, UzbekistanYu. M. FedorovKirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russia
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Аннотация
The domain structure of a diluted weak α-Fe2O3: Ga ferromagnet is considered. Magnetic fields of specific amplitudes and orientations applied in the basal plane of the crystal are found to produce nonuniform magnetic states due to a periodic deviation of the antiferromagnetic vector from the easy axis of crystallographic anisotropy. A phase diagram of the modulated magnetic state with the triad axis is constructed, and a dependence of the spatial period of modulation on an external magnetic field is studied. A phenomenological model and the nature of the magnetic superstructure discovered are discussed.
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