Static magnetic properties at low and medium field of gamma-Fe/sub 2/O/sub 3/ particles with controlled dispersion

/spl gamma/-Fe/sub 2/O/sub 3/ small particles (/spl les/10 nm) with various dispersion rates were studied by static magnetic measurements at low and medium applied fields. The results raise various questions concerning the determination of the non-relaxing magnetic moment and of the particle volume, the role of the particle surface and interactions.<
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