Scaling the effect of the dipolar interactions on the ZFC/FC curves of\n random nanoparticle assemblies

2011/06/17 by David Serantes, Serantes, David, Manuel Pereiro +5 · 1 citation
Biochemistry, Genetics and Molecular Biology · Engineering · Physics and Astronomy · #Characterization and Applications of Magnetic Nanoparticles #FOS: Physical sciences #Geomagnetism and Paleomagnetism Studies #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Theoretical and Computational Physics

paper · pdf · doi:10.48550/arxiv.1106.3403

openalex publication_date 2011/06/17 · openalex created_date 2022/02/25 · openalex updated_date 2026/07/28

Abstract

Zero Field Cooling (ZFC) and Field Cooling (FC) protocols are commonly used\nto investigate the properties of magnetic nanoparticle systems. For\nnon-interacting conditions the particle properties are fairly well correlated\nwith the shape of the ZFC/FC curves. However, that is not the case when\nsignificant dipolar interparticle interactions (DII) are present, what\nfrequently occurs in experimental samples (e.g. aggregates in biological\nsystems; or the dried powder often used for the ZFC/FC measurements). The\npurpose of this work is to show how the influence of the DII on the ZFC/FC\ncurves, computed by the volume sample concentration c, can be described in a\ngeneral way if scaled by the dimensionless parameter c₀ = 2K/M_S²; where K\nand M_S are the anisotropy and saturation magnetization constants of the\nparticles, respectively. This scaling parameter, which is straightforwardly\nderived from the energy equation governing the system, has an analogous meaning\nto the normalization of the external magnetic field H by the anisotropy field\nof the particles, H_A = 2K/M_S. We use a Monte Carlo technique to show how\napparently different T_B vs. c curves of various particles types (where T_B is\nthe blocking temperature), follow the same trend if scaling c/c₀.\n

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