.. index:: CompositePCRmagnet
ZF KuboToyabe when B = 0. A damped cosine precession when B_int>0 .
When B = 0,
A(t)= A_0\left(\frac{1}{3}+\frac{2}{3}\cos(g_\mu B_0t)e^{-\sigma^2 t^2+\frac{2}{5}\Delta^2 t^2}\right) .
When B > 0 ,
A(t) = A_0\left(\frac13+\frac23(1-(\Delta t)^2)e^{-(\Delta t)^2/2}\right)
where,
A_0 is the amplitude,
\sigma (MHz) is the gaussian relaxation rate,
B_0 (G) is the gaussian relaxation rate,
and \Delta is the relaxation rate of the extra term when B>0 .
.. plot:: from mantid.simpleapi import FunctionWrapper import matplotlib.pyplot as plt import numpy as np x = np.arange(0.1,16,0.1) y = FunctionWrapper("CompositePCRmagnet") fig, ax=plt.subplots() ax.plot(x, y(x)) ax.set_xlabel('t($\mu$s)') ax.set_ylabel('A(t)')
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[1] F.L. Pratt, Physica B 289-290, 710 (2000).
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