Abstract
Hexagonal, twin-free HoMnO3 (0001) films of 25–240nm thickness were grown epitaxially on Y2O3:ZrO2(111) substrates using pulsed laser deposition. Ferroelectric polar order and Mn3+ antiferromagnetism were observed by optical second harmonic generation. Magnetization data reveal Ho3+ ordering which is, with subtle deviations, similar to that of bulk crystals. However, three phase transitions below 6K and thermal hysteresis of magnetization at T<42K were detected.
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