Nuclear spin.

Nuclear magnetism Abragam, A. 1982 Nuclear spin relaxation in liquids: theory, experiments, and applications Kowalewski, Jozef 2006 Nuclear spin-parity assignments Editor: Norwood B. Gove, associate editor: Russell L. Robinson 1966 Spins in optically active quantum dots Gywat, Oliver 2010 Spintronic materials and technology [edited by] Y.B. Xu, S.M. Thompson 2007