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Study of structural and magnetic properties of epitaxial 57Fe-enriched thin-film nanostructures during thermal oxidation
Russian version
Blinov I. V. 1, Milyaev M. A. 1, Korkh Y. V. 1, Kuznetsova T. V. 1, Maksimova I. K. 1, Stolbovsky A. V. 1, Germov A. Yu. 1, Goloborodsky B. Yu. 1, Falahutdinov R. M. 1, Osinnikov E.V. 1, Devyaterikov D. I. 1
1M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
Email: blinoviv@mail.ru, milyaev@imp.uran.ru, korkh@imp.uran.ru, kuznetsova@imp.uran.ru, maksimovaik@imp.uran.ru, stolbovsky@imp.uran.ru, germov@imp.uran.ru, borisgolob@yandex.ru, falahutdinov@imp.uran.ru, egor.osinnikov@yandex.ru, devidor@imp.uran.ru
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This work investigates the effects of thermomagnetic treatment on the structural and magnetic properties of epitaxial layered structures MgO(100)/57Fe(50 nm)/Cr(2 nm). Using X-ray diffraction, Raman spectroscopy, atomic force microscopy, and Mossbauer spectroscopy, we analyzed structural changes during annealing in the temperature range of 200-300 oC. The study reveals that at temperatures above 250 oC, oxygen diffusion through the protective Cr layer leads to the formation of antiferromagnetic α-Fe2O3. An increase in coercivity up to 190 Oe at 280 oC is attributed to exchange coupling between Fe and α-Fe2O3. However, no shift in the magnetic hysteresis loop (exchange bias) is observed, which may result from low magnetic anisotropy of hematite (α-Fe2O3) and structural and chemical inhomogeneity at the interlayer boundaries. Keywords: Hematite (α-Fe2O3), unidirectional anisotropy, thermomagnetic treatment, oxygen diffusion, exchange bias, epitaxial thin films, interface engineering, magnetic nanostructures.
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