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\begin{document}
\title{Magnetocaloric effect in amorphous  Gd$_{65}$Fe$_{15-y}$Co$_{5+y}$Al$_{10}$X$_{5}$ (y~=~0,~5,~10; X~=~Al,~Si,~B) ribbons}
\author{\underline{N. Pierunek}}
\affiliation{Institute of Molecular Physics, PAS, Poznań, Poland}
\author{Z. Śniadecki}
\affiliation{Institute of Molecular Physics, PAS, Poznań, Poland}
\author{J. Marcin}
\affiliation{Institute of Experimental Physics, SAS, Košice, Slovakia}
\author{I. Škorvánek}
\affiliation{Institute of Experimental Physics, SAS, Košice, Slovakia}
\author{B. Idzikowski}
\affiliation{Institute of Molecular Physics, PAS, Poznań, Poland}
\begin{abstract}
Magnetocaloric effect (MCE) is described as the adiabatic temperature change $\Delta T_{ad}$ or the isothermal magnetic entropy change $\Delta S_{M}$, which is a function of  temperature and magnetic field. We focus our attention on MCE in Gd$_{65}$Fe$_{15-y}$Co$_{5+y}$Al$_{10}$X$_{5}$ (y~=~0,~5,~10; X~=~Al,~Si,~B) alloys. The synthesized melt-spun materials have amorphous structure, confirmed by XRD. The $T_C$, determined from $M(T)$ curves by the inflection method  ranges  from 145~K to 195~K. The values of $\mu_{eff}$ for all analyzed samples are equal to about 6~$\mu_B$/atom and are smaller than the magnetic moment of Gd$^{3+}$ free ion, which is equal to 7.94 $\mu_B$, mainly due to the presence of 3$d$ elements. The maximum value of  magnetic entropy changes (change in  the magnetic field from 0~to~5~T) is 7.1~Jkg$^{-1}$K$^{-1}$ for Gd$_{65}$Fe$_{10}$Co$_{10}$Al$_{10}$B$_{5}$. The related refrigeration capacity is equal to 748~Jkg$^{-1}$. All ribbons exhibit second order phase transition, which  is confirmed on the basis of the universal curve and field dependent critical exponent $n$ analysis [1].


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

{\scriptsize[1] V. Franco, J.S. Blázquez, A. Conde, Appl. Phys. Lett. \textbf{89} (2006) 222512}
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\end{abstract}
\maketitle

\end{document}
