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\begin{document}
\title{Transition into the vortex state in dysprosium observed on ZFC and FC curves }
\author{\underline{B. David}}
\affiliation{CEITEC IPM, Institute of Physics of Materials, Academy of Sciences of the Czech Republic, v.v.i., Žižkova 22, CZ-61662 Brno, Czech Republic}
\author{O. Schneeweiss}
\affiliation{CEITEC IPM, Institute of Physics of Materials, Academy of Sciences of the Czech Republic, v.v.i., Žižkova 22, CZ-61662 Brno, Czech Republic}
\author{M. Hapla}
\affiliation{CEITEC IPM, Institute of Physics of Materials, Academy of Sciences of the Czech Republic, v.v.i., Žižkova 22, CZ-61662 Brno, Czech Republic}
\begin{abstract}
The studies of the magnetic phase diagram of a single crystal of dysprosium (Dy) identified four main regions: helical antiferromagnetic phase, angular ferromagnetic phase, fan phase and collinear ferromagnetic phase [1]. Just below T$_{N}$ = 180 K, an~anomaly was identified and ascribed to the so called vortex state. The vortex state exists in the~temperature range 170$\--$180 K (at zero applied magnetic field) and disappears above 0.3 T. We have examined the region of the vortex state through the~evaluating of the characteristic transition temperatures on zero field cooled curves (ZFC) and field cooled curves (FC) for applied fields up to 0.3 T. Measurements were performed on a QD PPMS ECII 9T device using the VSM option. We conclude that vortex state develops only by cooling as a kind of transition state between paramagnetic state and helical antiferromagnetic state. By heating, fully developed helical antiferromagnetic state converts directly into paramagnetic state. 


\textbf{References:}
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{\scriptsize[1] M.T. Alkhafaji, Naushad Ali, J. Alloy. Compd. 250 (1997) 659-661.}
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\end{abstract}
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\end{document}
