Friday 6 May 2016

Competition between interactions and anisotropy in NPs

Understanding particle size and distance driven competition of interparticle interactions and effective single-particle anisotropy.
B Pacakova, A Mantlikova, D Niznansky, S Kubickova and J Vejpravova
Journal of Physics: Condensed Matter 28, 206004 (2016)
 Comparison of volume dependence of TMAX, representing the blocking temperature of the ensemble of the NPs with size distribution and interparticle interactions; $T_{\text{Bm}}^{\text{int}}$  attributed to blocking temperature of Vm affected by interparticle interactions and finally ${{T}_{\text{B}}}=\left(T_{\text{Bm}}^{\text{int}}-{{T}_{\text{d}-\text{d}}}\right)/C$ , which is the blocking temperature attributed to Vm after decoupling the effect of dipole–dipole interactions and external DC magnetic field ${{\mu}_{0}}{{H}_{\text{DC}}}=10$  mT (equation (4)). $C={{\left(1-\frac{{{H}_{\text{DC}}}}{{{H}_{\text{K}}}}\right)}^{3/2}}$ . Line corresponds to the fit encountering the finite size effect with ${{K}_{\text{c}}}=2.1\times {{10}^{5}}$  Jm−3, ${{K}_{\text{s}}}=1.5\times {{10}^{-3}}$  Jm−2.
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