How can I offset my ylabel so it doesn't smudge with the numbers?

code
\begin{figure}[H]
\centering
\begin{tikzpicture}
\begin{axis}[
scale=1.8,
xmin=-15,xmax=15,xlabel={Current $mA$}, ylabel={Residuals $mV$}
]
\addplot [only marks, black, error bars/.cd, y dir=both, x dir=both, y explicit, x explicit, error bar style={color=mapped color}]
table[x=Residuals,y=Voltage,x error=xerr,y error=yerr]{sfnErr.dat}; % plot the data
\draw[ultra thin,gray] (axis cs:\pgfkeysvalueof{/pgfplots/xmin},0) -- (axis cs:\pgfkeysvalueof{/pgfplots/xmax},0);
\end{axis}
\end{tikzpicture}
\caption{*}
\end{figure}
\pgfplotsset{every axis y label/.append style={xshift=1.5em} }Adjust the distance as suitable. – Jan 31 '13 at 00:56\begin{axis}[every axis y label/.append style={xshift=1.5em}]– Jan 31 '13 at 01:04sfnErr.dat. – hpesoj626 Jan 31 '13 at 01:16