ABSTRACT
Nanomagnet logic (NML) is a novel scheme for performing Boolean logic by encoding digital bits as directions of magnetization in nanomagnets that are on the size scale of a few hundred nanometers. Prior research on NML has relied solely on field coupling among nanomagnets, and any directionality was built in using shape anisotropy. This chapter discusses two important improvements to the NML scheme. The first method is the addition of unidirectional anisotropy in ferromagnets achieved by exploiting exchange bias between layers of each nanomagnet that alternate directions. The second is the use of exchange coupling among nanomagnets mediated by a common underlying magnetic film. Imre simulated a pair of magnets with trapezoidal shapes to demonstrate sequential switching that can provide directionality. However, Novel approach is not useful in longer data lines or logic gates. Selective clocking of subgroups of magnets within a clock zone is the primary requirement for synchronous nanomagnet logic.
