Electrically controlled nonvolatile switching of single-atom magnetism in a Dy@C84 single-molecule transistor

Single-atom magnetism switching is a key technique towards the ultimate data storage density of computer hard disks and has been conceptually realized by leveraging the spin bistability of a magnetic atom under a scanning tunnelling microscope. However, it has rarely been applied to solid-state transistors, an advancement that would be highly desirable for enabling various applications. Here, we demonstrate realization of the electrically controlled Zeeman effect in Dy@C 84 single-molecule transistors, thus revealing a transition in the magnetic moment from 3.8 μ B to 5.1 μ B for the ground-state G N at an electric field strength of 3 − 10 MV/cm. The consequent magnetoresistance significantly increases from 600% to 1100% at the resonant tunneling point. Density functional theory calculations further corroborate our realization of nonvolatile switching of single-atom magnetism, and the switching stability emanates from an energy barrier of 92 meV for atomic relaxation. These results highlight the potential of using endohedral metallofullerenes for high-temperature, high-stability, high-speed, and compact single-atom magnetic data storage. Manipulating single-atom magnetism via an electric field promotes the downsizing of memories and transistors towards the atomic limit. Wang et al. show the electrically controlled Zeeman effect in Dy@C 84 single-molecule transistors with magnetoresistance from 600% to 1,100% at the resonant tunnelling point.