Phys. Rev. B 35, 4810–4811 (1987)Morin temperature of annealed submicronic α-F2O3 particlesReceived 15 December 1986; published in the issue dated 1 April 1987 The Morin temperature (TM0) of annealed, monodispersed, nearly spherical particles having diameters (d) between (0.07–0.62) μm have been investigated. A plot of TM0 versus 1/d is linear. The extrapolation of this plot between 230 and 262 K to d=∞ gives TM0=264±2 K, the Morin temperature of the bulk α-Fe2O3. Furthermore, TM0=0 implies d=83±5 Å, which is the size limit for the onset of superparamagnetism in this system. © 1987 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.35.4810
DOI:
10.1103/PhysRevB.35.4810
PACS:
75.40.-s
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