What happens to the magnetic field strength of a superconducting magnet as temperature decreases?

As the temperature of a superconducting magnet decreases, its magnetic field strength increases due to the unique properties of superconductors. In the superconducting state, materials exhibit zero electrical resistance, allowing them to carry electric current without energy loss. This property enables superconductors to exhibit a phenomenon known as the Meissner effect, which expels magnetic fields and allows the material to maintain a stable magnetic field.

As the temperature approaches absolute zero, the superconducting state becomes more pronounced, leading to more efficient and stronger magnetic fields. The reduction in thermal agitation at lower temperatures allows the superconducting magnet to maintain a consistent and stronger current, thus enhancing the strength of the magnetic field it generates.