Can a hobbyist make a scale model experience optical
invisibility? Let's take a shot at it.
In FMR, there are two vectors along one line but pointing
in opposite directions. These are the magnetization vector
and the angular momentum vector. The precession of
the vectors describe upper and lower cones joined
together like the two halves of an hourglass.
The precession of the magnetization vector produces a
rotating magnetic field. Where the two precession cones
join, a rotating radial electric field expands outward.
This radial electric field is similar to that produced by a
Homopolar generator, with a magnetic field rotating
through a fixed metal disk. (Check out Homopolar
Generators on Google.) Or, see Feynman's Lectures
on Physics, 1963, v2 chp17 p3. Feynman uses a fixed
magnet and a rotating disk. These configurations are
equivalent according to Special Relativity.
The radial electric field of the Homopolar generator is
confined to the disk. The field produced by FMR extends
beyond the iron body into the surrounding space. It has
different strengths at different radii.
The same physics of invisibiltiy applies to both scale
model and to ship. It will be easiest to describe the effect
using the ship as an example.
Sunlight is reflected off the ocean into the surrounding air.
If you put a mirror perpendicular to the surface of the ocean,
the image of the water appears in the mirror.
Now the rotating electric field around the circumference of
the ship causes the light from the water ( a medium of high
index of refraction) to be totally reflected by the surrounding
air (a medium of low index of refraction). Compare:
The ship disappears in a mirage of ocean water. It looks like
the water continues on indefinitely.