ABSTRACT
As structural glass transitions are very difficult to think about and model, it is worth while studying carefully the magnetic analogues of glasses, the spin glasses, and in particular their dynamics. Spin glasses could be investigated conveniently both in the laboratory and numerically, because of their magnetic character. Muon spin research (μSR) can probe slowly relaxing spin systems with a wide relaxation rate spectrum, and the technique has been used very effectively to investigate spin glass relaxation behaviour. The global phase space of a system consists of all its possible configurations or microscopic instantaneous states. The depolarisation rate of a muon at a given site is then proportional to the relaxation time of the local spins in its immediate environment. In real spin glasses, the same pattern has proved difficult because the time scales fall in an awkward range and the strongly non-exponential dynamics mean that a wide time spectrum must be covered.
