Phys. Rev. Lett. 67, 3602–3605 (1991)Size-dependent Curie temperature in nanoscale MnFe2O4 particlesReceived 3 June 1991; published in the issue dated 16 December 1991 We have determined the Curie temperature Tc of ferrimagnetic MnFe2O4 nanoscale particles by means of direct measurement of the magnetization. A considerable enhancement in Tc compared to the bulk was observed for particles in the size range 7.5 to 24.4 nm. At d=7.5 nm, Tc is 97 K higher than for the bulk material. The shift in Curie temperature is well described by the finite-size-scaling formula [Tc(d)-Tc(∞)]/Tc(∞)=(d/d0)-1/ν with ν=0.71±0.07 and d0=2.0 nm. © 1991 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.67.3602
DOI:
10.1103/PhysRevLett.67.3602
PACS:
75.60.Jp, 05.70.Jk, 64.60.-i, 75.40.-s
See AlsoComment: P. J. van der Zaag, A. Noordermeer, M. T. Johnson, and P. F. Bongers, Comment on ‘‘Size-dependent Curie temperature in nanoscale MnFe2O4 particles’’, Phys. Rev. Lett. 68, 3112 (1992). Comment: V. A. Brabers, Comment on ‘‘Size-dependent Curie temperature in nanoscale MnFe2O4 particles’’, Phys. Rev. Lett. 68, 3113 (1992). |
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