Superparamagnetism, the archetypal small particle phenomenon, was first described by Louis Néel (1949a,b) in the context of rock magnetism. Key features of the underlying micromagnetism had been described by Stoner and Wohlfarth (1948), in the context of industrial magnetic alloys. The physical theory of superparamagnetism was further developed by William Fuller Brown (1963, 1979; see Rubens 1979). Many recent and ongoing additional advances are motivated by the potential for improved nanotechnological applications. One of my main aims in writing this chapter is to help bridge the gap that presently exists between the still largely...

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