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\subsection{Varying the Polarization time}  When an external magnetic  field B is applied to a sample, the magnetization M exponentially approaches the equilibrium magnetization. The magnetization does not assume the equilibrium value instantaneously. The relationship between the polarization time and the voltage is described by the growth rate. The growth rate of M(t) towards $M_{\infty}$ is described by the following equation, \begin{equation}  \label{eq:growthrate}  M(t)=M_{\infty}(1-e^\frac{t}{T_1})