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001-es BibID:	BIBFORM114569
Első szerző:	Egri Sándor (fizikus)
Cím:	Self-assembly of magnetic spheres: a new experimental method and related theory / Sándor Egri, Gábor Bihari
Dátum:	2018
ISSN:	2399-6528
Megjegyzések:	Simple experimental method was developed to examine magnetic self-assembly of macroscopic magnetic spheres of 3mm and 5mm diameters in the lack of external magnetic field. Magnetic force driven aggregation was followed up by video recording and was analysed in detail to identify the processes that lead to the creation of clusters(chains, pairs, circles, etc). Self-aggregation of randomly distributed single spheres, pairs and triplets were examined with this method as well. Applying several liquid media with different viscosity helped to characterize the aggregation processes regarding the kinetic energy of collisions. The results were compared with results of previous experimental works and computer simulations of aggregation of magnetic nanoparticles and magnetic-dipolar systems. Besides to earlier described rings and chains that represent the lowest potential energy of the system of ideal magnetic dipoles in two dimensions, we observed several other structures during the experiments. The most frequently appearing clusters were investigated by direct minimization of the potential energy function of these structures.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk magnetic spheres single spheres chains self-assembly
Megjelenés:	Journal of Physics Communications. - 2 (2018), p. 105003-105015. -
További szerzők:	Bihari Gábor (1971-) (fizikus)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM114432
035-os BibID:	(WoS)000624464000001 (Scopus)85102171921
Első szerző:	Egri Sándor (fizikus)
Cím:	A simple magnetic oscillator-rotator model made of magnetic balls, and its examination by video-analysis / Sándor Egri, Gábor Bihari
Dátum:	2021
ISSN:	0143-0807
Megjegyzések:	We built a simple structure of seven dipole neodymium magnetic balls, a magnetic spinner that easily rotates around its central ball. This proved to be a very simple magnetic oscillator-rotator with a dipole-like field. After capturing videos of its rotating movements in different magnetic fields, video analysis has provided us with the rotation angle-time function of the motion, either in the case of a stationary magnetic field (damped oscillation) or an alternating magnetic field (forced oscillations). We were able to obtain a numerical solution for the differential equation describing the motion, a solution which was in tune with the special phenomena observed. It was especially interesting?and can be utilised in physics education?that the oscillation of the system was very strongly dependent on the initial conditions and seemed to be quite chaotic. The rotation angle, angular speed functions and their representation in phase space have shown the characteristics of chaotic behaviour, especially in the case of coupled oscillations. Thus, this kind of chaotic movement can be demonstrated very simply, even in classroom conditions by the use of such magnetic systems. At the same time, such models might help in the scientific understanding of magnetic nanostructures?their self-assembly and motions in alternating magnetic fields?which is the basis of practical applications such as magnetic hyperthermia.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	European Journal of Physics. - 42 : 3 (2021), p. 035002-035016. -
További szerzők:	Bihari Gábor (1971-) (fizikus)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon: