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\begin{document}
\title{Horizontal shift of the hysteresis loop for ultrathin Fe film on~MgO(001) substrate}
\author{\underline{B. Matlak}}
\affiliation{Faculty of Physics and Applied Computer Science, AGH-UST, Kraków, Poland}
\author{A. Kozioł-Rachwał}
\affiliation{Faculty of Physics and Applied Computer Science, AGH-UST, Kraków, Poland}
\author{K. Matlak}
\affiliation{Faculty of Physics and Applied Computer Science, AGH-UST, Kraków, Poland}
\author{J. Przewoźnik }
\affiliation{Faculty of Physics and Applied Computer Science, AGH-UST, Kraków, Poland}
\author{T. Ślęzak }
\affiliation{Faculty of Physics and Applied Computer Science, AGH-UST, Kraków, Poland}
\author{J. Korecki }
\affiliation{Faculty of Physics and Applied Computer Science, AGH-UST, Kraków, Poland}
\affiliation{Jerzy Haber Institute of Catalysis and Surface Chemistry, PAS, Krakow, Poland}
\begin{abstract}
Recently, Fan et al. [1] reported on a new exchange bias phenomenon that is manifested only in the Fe/MgO interface spins, and not in the bulk. In the present contribution we show that when the thickness of the epitaxial Fe film on MgO(001) is reduced to about 1 nm, the VSM hysteresis loop shows at low temperature a shift that is typical for the exchange bias systems composed of a ferromagnet and antiferromagnet. Narrow hysteresis loops at the room temperature were gradually broadened with lowering temperature and eventually,  below 15 K, became shifted, even when cooled \textit{without} external magnetic field. The maximum bias field of more than 100~Oe was observed at the film thickness of 0.9 nm. Our preliminary interpretation is that the interface Fe layer is antiferromagnetically coupled to the film interior due to existence of Fe-O-Fe bonds.


\textbf{References:}
\begin{spacing}{0.8}

{\scriptsize[1] Y. Fan, \textit{et al.}, Nature Nanotechnology 8, 438 (2013). }
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\end{abstract}
\maketitle

\end{document}
