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MA: Fachverband Magnetismus

MA 27: Frustrated Magnets I

MA 27.5: Vortrag

Mittwoch, 20. März 2024, 16:00–16:15, H 2013

Superparamagnetic behavior of magnetically frustrated rare earth element substituted R-type hexagonal ferrite suitable for biomedical applications — •Imran Sadiq — University of the Punjab, Lahore, Pakistan

This research article reported the inducement of frustration with the substitution of rare earth elements in already frustrated R-type hexagonal ferrites. Crystallographic X-ray diffraction refinement gave the evidence that all the samples display the single phase hexagonal structure with space group P63/mmc. The lattice parameter varied as concentrations increased. The particle sizes measured from TEM and HR-TEM was found to vary in the range of 10-15 nm. These nanoparticles are spherical in shape and exhibit single magnetic domain. The particle size is an excellent agreement with the crystalline size. VSM results revealed its superparamagnetic nature. This frustration turned the magnetic phase of the material from ferrimagnetic to superparamagnetic. It does not have appreciable magnetic hysteresis loop due to zero coercivity and have a negligible values of remanence and squareness ratio revealed its single magnetic domain. The hysteresis loops were fitted theoretically using Langevin function and were in good agreement with experimental results. These materials with almost negligible intrinsic magnetization are suitable for biomedical application especially targeted drugs delivery.

Keywords: Frustrated magnets; Hexagonal ferrites; Superparamagnetic; TEM analysis; Targeted Drug delivery