Automata with a circle like Feedback-Loop

[hubbub]

hei im new to pgf / tikz and this is what i could manage with the help of the manuel:

\documentclass{article}
\usepackage{pgf}
\usepackage{tikz}
\usetikzlibrary{arrows,automata}
\usepackage[latin1]{inputenc}
\begin{document}

\begin{tikzpicture}[sty/.style={rectangle,draw=black!50,thick,inner sep=0pt,minimum size=10mm},>=stealth']

  \node[sty] (rec) {1 1 1};
  \draw [->,rounded corners] (rec.east) .. controls +(right:10mm) and +(up:10mm).. (rec.north);

\end{tikzpicture}

\end{document}

Now that looks like :  but i want the Feedback Loop to be more like a part of a Circle instead of this ellipse like curve. Can u help me to accomplish that?

Thanks!