Spin Seebeck effect has been investigated in Pt/ε-Fe2O3 bilayers. The ε-Fe2O3 thin layer with 40−70~nm thickness were deposited by a spin-coating method on Y:ZrO2(100) substrates. The prepared layers are highly oriented with the easy magnetic a-axis parallel to the film surface. The magnetic hysteresis loops measured at room temperature with magnetic field parallel to the layer exhibit coercive fields up to 11.6~kOe, which is so far the highest value measured for ε-Fe2O3 thin layer samples. The shape of the spin Seebeck hysteresis loops is similar to the shape of magnetization for single phase layers with coercive field around 10~kOe. In some prepared layers a small amount of secondary soft ferrimagnetic phase is revealed by a constricted shape of magnetization loops, in contrast to spin Seebeck loops, where no constriction is observed. A difference in encountered in the case of layers with a small amount (1−2~volume\%) of secondary soft ferrimagnetic phase, which is revealed by a constricted shape of magnetization loops, in contrast to spin Seebeck loops, where no constriction is observed.
@article{arxiv.1804.02159,
title = {Spin Seebeck effect in $\varepsilon$-Fe$_2$O$_3$ thin layer with high coercive field},
author = {K. Knížek and M. Pashchenko and P. Levinský and O. Kaman and P. Jiříček and J. Hejtmánek and M. Soroka and J. Buršík},
journal= {arXiv preprint arXiv:1804.02159},
year = {2021}
}