Magnetic Droplets in a Nanowire
In a thin film of cobalt and iron deposited on a silicon substrate, a tiny magnetic vortex twists into existence.
A magnetic compass built into a crystal
Every oscillator carries its own compass, built into the crystal lattice. Until now, spin Hall nano-oscillators, tiny microwave sources driven by spin current, could not do without an external magnet: it was the magnet that set the common axis around which the magnetization oscillated.