title: Ferromagnetism of 3He films in the low-field limit.
abstract: We provide evidence for a finite-temperature ferromagnetic transition in two dimensions as H -->0 in thin films of 3He on graphite, a model system for the study of two-dimensional magnetism. We perform pulsed and cw NMR experiments at fields of 0.03-0.48 mT on 3He at areal densities of 20.5-24.2 atoms/nm(2). At these densities, the second layer of 3He has a strongly ferromagnetic tendency. With decreasing temperature, we find a rapid onset of magnetization that becomes independent of the applied field at temperatures in the vicinity of 1 mK. Both the dipolar field and the NMR linewidth grow rapidly as well, which is consistent with a large (order unity) polarization of the 3He spins.
authors.affiliation: Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089-0484, USA.
authors.forename: H M
authors.initials: HM
authors.lastname: Bozler
authors.forename: Yuan
authors.initials: Y
authors.lastname: Gu
authors.forename: Jinshan
authors.initials: J
authors.lastname: Zhang
authors.forename: K S
authors.initials: KS
authors.lastname: White
authors.forename: C M
authors.initials: CM
authors.lastname: Gould