In a ferromagnetic nanodisk, the magnetization tends to swirl around in the plane of the disk and can point either up or down at the centre of this 'magnetic vortex'. This binary state could be ...

The magnetic field over North America is weakening at an unusually rapid rate, while the field over the eastern hemisphere, including China, is strengthening, according to a study conducted by ...

Temperatures have plunged to -30C (-22F) and below in parts of North America as extreme cold weather known as a polar vortex strikes the region. At least eight people are reported to have died in ...

They appear less often at the north pole. The scientists theorize that a magnetic vortex generated in the ionosphere stirs up and concentrates the hydrocarbon haze that blankets the poles.