China builds the world’s most powerful magnet

Scientists in China have built the world’s most powerful magnet, capable of producing a magnetic field 800,000 stronger than Earth’s.
After four years of development, a team from the Chinese Academy of Science’s Hefei Institutes of Physical Science achieved a steady magnetic field of 42.02 tesla for its resistive magnet.
The new world record beat the previous record of 41.4 tesla that was set by researchers at the US National High Magnetic Field Laboratory in Florida in 2017.
The latest record-breaking magnet could lead to unexpected scientific breakthroughs, according to the researchers who developed it, including the observation of new quantum phenomena.
Its massive power has the potential to offer new insights in fields ranging from chemistry and physics, to material and life science, with its creators making it available to international users.
In recent decades there have been more than 10 Nobel prizes awarded to scientific discoveries achieved using a high magnetic field.
One key area for research has been in quantum phase transitions, which help explain the behaviour of electrons under extreme conditions. A better understanding of this field can lead to the development of improved semiconductors that are used in everything from smartphones to solar panels.
The amount of electricity required to produce ever stronger magnetic fields means that one of the key challenges to overcome with a magnet this powerful is the amount of heat it produces.
The 42 tesla resistive magnet requires 32.3 megawatts of electricity to produce the record-breaking field, and is the size of a small room in order to help prevent overheating.
“You’ve got to have a very good science case to justify that resource,” said Alexander Eaton, a condensed-matter physicist at the University of Cambridge, who was not involved in the latest breakthrough. “Every extra tesla is exponentially better than the last.”