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\begin{document}
\title{Magnetic properties of rapidly cooled Gd$_6$YPd$_3$}
\author{\underline{M. Oboz}}
\affiliation{University of Silesia, Institute of Physics, 40-007 Katowice, Poland}
\author{E. Talik}
\affiliation{University of Silesia, Institute of Physics, 40-007 Katowice, Poland}
\author{A. Guzik}
\affiliation{University of Silesia, Institute of Physics, 40-007 Katowice, Poland}
\author{P. Zajdel}
\affiliation{University of Silesia, Institute of Physics, 40-007 Katowice, Poland}
\author{G. Ziółkowski}
\affiliation{University of Silesia, Institute of Physics, 40-007 Katowice, Poland}
\begin{abstract}
Magnetic materials with relatively high Curie temperatures and large magnetocaloric effects (MCE) are researched as potential candidates for magnetic refrigeration [1-3]. The rc-cast Gd$_6$YPd$_3$ sample was prepared by the mould casting technique. The results were compared to the data of single crystal obtained by the Czochralski method from a levitating melt. The samples were characterized by means of X-ray diffraction, SQUID magnetometry and scanning electron microscopy in order to comparison magnetic and magnetocaloric properties in relation to the technological aspects. The Gd$_6$YPd$_3$ compound crystallizes in the hexagonal Th$_7$Fe$_3$ type of crystal structure. The investigated ferromagnetic system is sensitive to grain size. The Gd$_6$YPd$_3$ single crystal orders ferromagnetically at 299 K while the rc-cast Gd$_6$YPd$_3$ displays also ferromagnetic transition but at about 305 K. For the Gd$_6$YPd$_3$ single crystal the saturation magnetic moment per Gd ion is enhanced in relation to the theoretical value while for the rc-cast Gd$_6$YPd$_3$ only a slight overestimation is observed. The magnetocaloric effect decreases with the decrease of the grain size.


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

{\scriptsize[1] V.K. Pecharsky, K.A. Gschneidner, Jr.: Int. J. Refrig. 29 (2006) 1239.}

{\scriptsize[2] K.A. Gschneidner, Jr., V.K. Pecharsky, A.O. Tsokol: Rep. Prog. Phys. 68 (2005) 1479.}

{\scriptsize[3] E. Brück E: J. Phys. D: Appl. Phys 38 (2005) R381.}
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\end{abstract}
\maketitle

\end{document}
