Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65

MA 20.89: Poster

Montag, 7. März 2005, 14:00–18:00, Poster TU C

Magnetization of blocked magnetic nanoparticles — •H. Bremers, O. Michele, and J. Hesse — Institut für Metallphysik und Nukleare Festkörperphysik, Technische Universität, Mendelssohnstrasse 3, D-38106 Braunschweig, Germany

The basic properties of magnetic nanoparticle systems can be understood in the highly idealized well known Stoner-Wohlfart (SW) model. The simplicity of this model sometimes becomes more complex when considering the energy minima of the particles magnetic moments and very special the equilibrium angles corresponding with respect to the direction of the applied external magnetic field [1]. We show that in a rather simple vector model representing the effective behaviour of the nanoparticle system the estimation of the mean equilibrium angles can be simplified. The description of the magnetization of a blocked nanoparticle system versus magnetic field becomes easy and applicable to measurements performed on real magnetic particle systems. [1] H. Pfeiffer, phys. stat. sol. (a) 118(1990)295-306.