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What Happens During t
d
?
*
t
1
+t
2
= t
d
z
evolution of
vortex state during t
d
.
*
independent of
t
0
z
no
evolution for
I
=0
*
t
1
+(-t
2
) = t
d
z
not reversed
by reversing current
l
System evolves during
t
d
l
Evolution stops in the absence of current
l
Irreversible
process
Current Drive
Current
Interrupted