magnet cooled...

"Magnetic Refrigeration

Currently, refrigeration cycles typically use a fluid as the working substance undergoing a compression and expansion cycle. Efficiencies are limited due to irreversibilities in the compression and heat transfer process. A cycle that has the potential to be an efficient means of producing refrigeration at cryogenic temperatures is the Active Magnetic Regenerative (AMR) cycle. This cycle makes use of solid magnetic refrigerants typically composed of rare earth elements and alloys ordering ferromagnetically. The magnetic materials display a characteristic temperature rise when the magnetic flux density is increased known as the magnetocaloric effect (MCE). Near the ordering temperature, this temperature change can be highly reversible. When used in an AMR cycle the magnetic refrigerant acts as a thermal storage medium (a regenerator) as well as the means of work input"

not super exciting, but still pretty sweet.