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Two-Dimensional Ferromagnetism of a 3He Film: Influence of Weak Frustration
Casey, A., Neumann, M., Cowan, B., Saunders, J. and Shannon, NHe-3 films adsorbed on the atomically flat surface of graphite provide a model system for the study of two-dimensional magnetism on a triangular lattice. We have made a study of the regime in which the T = 0 ground state of the second He-3 layer is a fully polarized ferromagnet. NMR, using broadband SQUID detection, at a range of low fields above the spin-flop transition, and over a wide temperature range 0.3-200 mK, has enabled us to disentangle the influence of sample finite size effects and magnetic field on the spin-wave spectrum. We demonstrate that the spin-wave spectrum is governed by a different effective exchange constant than that determining the high temperature magnetism. This is understood in terms of frustrated atomic ring exchange.
Phys. Rev. Lett. 111, 12, 125302 (2013)
doi: 10.1103/PhysRevLett.111.125302