Abstract
Recent experiments have measured the magnetisation of one to three 3He atomic layers adsorbed on graphite. The properties of this novel system were interpreted by a two-dimensional ferromagnetic Heisenberg model. The authors perform real-space renormalisation group calculations for the two-dimensional triangular Heisenberg model with a magnetic field. They also make a quantum mechanical generalisation of a method which calculates the magnetisation recursively at any point of the global phase diagram. Their theoretical results for T>J=2.1 mK agree well with the experimental data and the exact high-temperature expansion. For T<J the agreement with the data is only qualitative.
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