SKM 2023 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 35: Poster Session II
CPP 35.13: Poster
Mittwoch, 29. März 2023, 11:00–13:00, P1
Mixture of magnetic and non-magnetic ellipsoids — •Elena Pyanzina1, Anna Akisheva1, Tatyana Belayeva1, Marina Gupalo1, and Sofia Kantorovich2 — 1Ekaterinburg, Russia — 2University of Vienna, Vienna, Austria
In this contribution, mixtures of magnetic and non-magnetic ellipsoids were studied. We chose systems with the ratio of the semi-axes equal to 3 and 5 and different concentrations, as well as the direction of the magnetic moment along the main axis. The ratios of magnetic and non-magnetic particles considered were as follows: 30/70, 50/50 and 70/30. The initial susceptibility of such systems was calculated since the magnetic response of the system is very important for various applications. It turned out that with an increase in the magnitude of the magnetic moment, a structural transition occurs in the system: first, the initial susceptibility increases, and then it becomes almost zero. This is because the basic state of elongated ellipsoids is an antiparallel pair, which becomes stable with an increase in the magnitude of the magnetic moment. And its total magnetic moment is quite small, and the susceptibility of such an object is much lower than that of a pair of particles with a head to tail orientation. The behavior of mixtures of ellipsoids with similar systems of magnetic disks (like ellipsoids with a magnetic moment perpendicular to the main axis) was also compared. It turned out that at large values of the magnetic moment, the disks form "stacks" in which the magnetic moments are directed head to tail, and ellipsoids form flat structures with a thickness of one ellipsoid, with an antiparallel orientation of the moments.