z
x
Mxy
y
Bo
z
x
Mxy
y
wo
Laboratory Frame
Rotating Frame
Laboratory
Frame vs. Rotating Frame
To simplify analysis we convert to the rotating frame.
Simply, our axis now rotates at the
Larmor Freguency (wo).
In the absent of any other factors, Mxy will stay on the x-axis
All further analysis will
use the rotating frame.