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Magnetic properties of submicron α-Fe2O3 layers grown on sapphire by mist-CVD
Kharitonskii P. V.
1, Nikolaev V. I.1, Timashov R. B.1, Stepanov A. I.1, Shcheglov M. P.1, Gareev K. G.
1,2, Ralin A. Yu.3, Sergienko E. S.
1,4
1Ioffe Institute, St. Petersburg, Russia
2St. Petersburg Electrotechnical University ”LETI“, St. Petersburg, Russia
3Far Eastern Federal University, Vladivostok, Russia
4St. Petersburg State University, St. Petersburg, Russia
2St. Petersburg Electrotechnical University ”LETI“, St. Petersburg, Russia
3Far Eastern Federal University, Vladivostok, Russia
4St. Petersburg State University, St. Petersburg, Russia
Email: kggareev@yandex.ru
Magnetic properties of submicron iron (III) oxide layers deposited by mist-CVD epitaxy on a sapphire substrate of basal orientation (0001) with and without a 2H-GaN buffer layer were studied. It was shown that both layers are close in composition to α-Fe2O3 (hematite). The presence of the GaN buffer layer leads to an increase in the saturation magnetization and saturation remanence. Magnetometry and magnetic force microscopy data allowed theoretical estimates to be made indicating the presence of vortex magnetic structures in the studied layers. Keywords: Iron oxide, hematite, maghemite, gallium nitride, submicron layers, sapphire, mist-CVD, magnetic hysteresis, magnetic states, vortex structures.
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