Ferromagnetism of $^3$He Films in the Low Field Limit

Details Ferromagnetism of $^3$He Films in the Low Field Limit Ferromagnetism of $^3$He Films in the Low Field Limit

2001-12-13

arxiv.org/abs/cond-mat/0112237v1

Physics

Condensed Matter

4 figures

Scientific paper

10.1103/PhysRevLett.88.065302

We provide evidence for a finite temperature ferromagnetic transition in 2-dimensions as $H \to 0$ in thin films of $^3$He 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 $^3$He at areal densities of 20.5 - 24.2 atoms/nm$^2$. At these densities, the second layer of $^3$He 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 $^3$He spins.

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