Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 17: Poster Session I

MA 17.6: Poster

Dienstag, 8. März 2016, 09:30–12:30, Poster B1

Carbon nanotube encapsulated magnetic particles: Insights from statistical analysis — •Markus Gellesch¹, Marcel Haft¹, Silke Hampel¹, Sabine Wurmehl^1,2, and Bernd Büchner^1,2 — ¹IFW Dresden, Institute for Solid State Research, PF 270116, 01171 Dresden, Germany — ²Institute for Solid State Physics, Dresden Technical University, TU Dresden, 01062

We report investigations of assemblies of carbon nanotube encapsulated intermetallic magnetic nanoparticles. As a result from annealing treatments with various durations, the evolution of particle size and, likewise, of magnetic properties with progressing annealing duration could be observed. Here, we present a thorough statistical analysis of particle samples which yielded a multimodal size distribution. The investigation of this size distribution as function of annealing time provided the grounds to formulate a model for formation and growth of metallic particles inside confined geometries (here: the inner cavity of the carbon nanotubes). The derived average particle size well-described known magnetic behavior of ferromagnetic nanoparticles. In detail, a multi- to single domain transition, as well as indications for a transition to the superparamagnetic state, were found in coercivity data as function of the characteristic nanoscale length of the considered nanoparticulate systems. Our study emphasizes the advantage of a detailed statistical analysis of assemblies of magnetic nanoparticles in order to obtain insights on particle formation and growth and, subsequently, on related physical properties, such as magnetism.