What is the magnetocaloric effect and what materials exhibit this effect the most?

Asked by: Tim Michnick


Some magnetic materials heat up when they are placed in a magnetic field and cool down when they are removed from a magnetic field. This is known as the magnetocaloric effect.

This effect was discovered by E. Warburg in 1881 in pure iron. The size of the effect has been around .5 to 2°C per Tesla change in magnetic field. One Tesla is about 20,000 times the earth's magnetic field.

Recently, alloys of gadolinium, germanium and silicon have produces a much larger effect size of 3 to 4°C per Tesla change. The general equation for this material is; Gd_5(Si_xGe_1-x)_4, where x=0.5.

Experimental refrigerators based on the magnetocaloric effect have been tested in laboratories using magnetic fields of around 5T produced by superconducting magnets.

Answered by: Scott Wilber, President, ComScire - Quantum World Corporation



Science Quote

'Physics is mathematical not because we know so much about the physical world, but because we know so little; it is only its mathematical properties that we can discover.'

Bertrand Russell

Top Selling

Here are our physics & astronomy bestsellers:
KonusScience 5 Way Microscope Kit
CHEM C1000 Chemistry Kit v2.0
Tin Can Robot 4M Kit
Potato Clock 4M Kit
3D Magnetic Field Tube
Revolving Multi-Color Fiberoptic Light
4M Kitchen Science Kit
Mini Plasma Ball
Top Secret - Spinning Top


USC University of Southern California Dornsife College Physics and Astronomy Department McMaster University Physics and Astronomy Department