Dresden 2017 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster: Polymer Networks and Dynamics
CPP 17.4: Poster
Montag, 20. März 2017, 18:30–21:00, P1C
FORC measurements in magnetic elastomers using molecular dynamic simulations — •Alla Dobroserdova1, Pedro Antonio Sanchez Romero2, Julia Linke3, Thomas Gundermann3, Sofia Kantorovich1,2, and Stefan Odenbach3 — 1Ural Federal University, Lenin av. 51, 620000, Ekaterinburg, Russia — 2University of Vienna, Sensengasse 8, 1090, Vienna, Austria — 3Dresden University of Technology, Helmholtzstr. 10, 01069 Dresden, Germany
Magnetic elastomers consists of magnetic particles distributed in a nonmagnetic elastic matrix. We use the FORC (first-order reversal curves) diagrams [C. R. Pike et al., J. Appl. Phys. 85, 6660 (1999)] to study how the matrix influences the internal magnetic interactions. Following the protocol of experimental measurements, we use Molecular Dynamics Simulations to model the system. We consider two different systems. In the first one, fixed nonmagnetic particles are connected with dipolar ones by springs to mimic magneto elastic coupling. In the second system, dipolar particles are replaced by magnetisable colloids. The first step is to get the main hysteresis loop of this system (changing the direction and intensity of an external magnetic field). The second part of the study includes the computer simulations to obtain the first-order reversal curves. In the result, we have the FORC diagrams in dependence of the coercive and the reversal fields. The research was supported by the RFBR Grant 16-52-12008 and the DFG Grant Od18/24-1 within the German-Russian Research Collaboration PAK907.