cheap data storage

Figure 1. Left: in a ferrimagnet, there are an equal number of spins in the up and in the down directions, but the magnitudes of the spins vary. The result is net magnetisation. Right: the synthetic ferrimagnet is made of two very thin layers of iron with a connecting layer in between. In the iron layers, all the spins have the same direction and magnitude. By combining layers with different magnetisation directions and different thicknesses, it is nevertheless possible to create net magnetisation.
Radboud professor invents magnet for fast and cheap data storage