Magnetoresistivity is where the electrical resistance (i.e. its resistivity and thus the electron flow) is affected by the application of a magnetic field. As electrons carry energy this equates to a modification in the thermal energy transported in the material (i.e the thermal conductivity). A large change in thermal conductivity (several orders of magnitude) can be obtained by the application of a magnetic field in the 1 to 2 Tesla region. We are investigating the thermal magnetoresistivity of tungsten to act as a solid state heat switch for our ADRs.
More information can be found in the following publication.
The pictures show
- The difference in thermal conductivity for one of our tungsten switches with a magnetic field of 1.8 Tesla "off" and zero magnetic field "on"
- The as grown tungsten crystal rod
- A completed tungsten heat switch with mounting flanges. This is cut from the solid rod by electron discharge machining (EDM).
Page last modified on 09 sep 11 14:55