We present a study of the magnetic properties of the superparamagnetic ferritin system by employing zero-ﬁeld (ZF) and longitudinal-ﬁeld (LF) +SR measurements. Two + fractions with different depolarisation behaviour are detected, one arising from muons stopped in the organic shell and one from muons stopped in the mineral core. The freezing of the superparamagnetic moments is evident in the temperature evolution of the ZF relaxation rates of both fractions. It occurs gradually below 60 K and is essentially complete at 11 K. The results are consistent with a distribution of blocking temperatures which in turn reﬂects the distribution of core sizes.
A $\mu$ SR study of the magnetic properties of ferritin / Cristofolini, Luigi; Prassides, K.; Vavekis, ; Amato, K. A.; Gygax, ; Schenck, A.; Giderc, Awschalomc. - In: HYPERFINE INTERACTIONS. - ISSN 0304-3843. - 104(1997), pp. 269-274.
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