Physics – Condensed Matter – Materials Science
Scientific paper
2000-07-28
J. Magn. Magn. Mater. 226-230 (2001) 1315
Physics
Condensed Matter
Materials Science
2 pages, 3 figures, Proceeding for ICM2000
Scientific paper
10.1016/S0304-8853(00)00838-6
A highly concentrated (17 vol.%) Fe-C nano-particle system, with a narrow size distribution $d = 5.4\pm 0.4$ nm, has been investigated using magnetic ac susceptibility measurements covering a wide range of frequencies (17 mHz - 170 Hz). A dynamic scaling analysis gives evidence for a phase transition to a low temperature spin-glass-like phase. The critical exponents associated with the transition are $z\nu = 10.5 \pm 2$ and $\beta = 1.1 \pm 0.2$. The reason why the scaling analysis works for this sample, while it may not work for other samples exhibiting collective behavior as evidenced by aging phenomena, is that the single particle contribution to $\chi''$ is vanishingly small for $T>T_g$ and hence all slow dynamics is due to collective behavior. This criterion can only be fulfilled for a highly concentrated nano-particle sample with a narrow size distribution.
Hansen Mikkel Fougt
Jonsson Patrik
Nordblad Per
Svedlindh Peter
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