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Blocking volume versus AR for chains of magnetite separated by different spacings (s=spacing/length). Two configurations are shown: (a) the magnetocrystalline easy-axis anisotropy aligned along the chain length (〈1 1 1〉) and (b) the hard axis aligned with the chain length (〈1 0 0〉). Relaxation time for (a) and (b) is t m=60 s.
