http://en.wikipedia.org/wiki/Magnetic_refrigeration http://en.wikipedia.org/wiki/Magnetic_refrigeration Dilution refrigerators have their limits, especially wh

http://en.wikipedia.org/wiki/Magnetic_refrigeration http://en.wikipedia.org/wiki/Magnetic_refrigeration Dilution refrigerators have their limits, especially when you're trying to cool a complex experiment with a lot of wires and fibers going into it (they all bring in heat). I've seen magnetic refrig units stuck inside of helium cryostats to give them the extra oomph to get such experiments down to millikelvin levels.