Magneto-Dielectric Behaviour of M-Type Hexaferrite/Polymer Nanocomposites

Abstract

In the present study two sets of nanocomposites consisting of an epoxy resin and BaFe12O19 or SrFe12O19 nanoparticles were successfully developed and characterized morphologically and structurally via scanning electron microscopy and X-ray diffraction spectra. The dielectric response of the nanocomposites was investigated by means of broadband dielectric spectroscopy and their magnetic properties were derived from magnetization tests. Experimental data imply that the incorporation of the ceramic nanoparticles enhances significantly the dielectric properties of the examined systems and their ability to store electrical energy. Dielectric spectra of all systems revealed the presence of three distinct relaxation mechanisms, which are attributed both to the polymer matrix and the nanoinclusions: Interfacial polarization, glass to rubber transition of the polymer matrix and the re-orientation of small polar side groups of the polymer chain. The magnetic measurements confirmed the ferromagnetic nature of the nanocomposites. The induced magnetic properties increase with the inclusion of hexaferrite nanoparticles. The nanocomposites with SrFe12O19 nanoparticles exhibit higher values of coercive field, magnetization, magnetic saturation and remanence magnetization. A magnetic transition was detected in the ZFC/FC curves in the case of the BaFe12O19/epoxy nanocomposites.

Effect of silane coupling on the properties of polylactic acid/barium ferrite magnetic composite filament for the 3D printing process

“…The coercivity ( H c ) of the magnetic composite filaments did not significantly change and remained nearly constant for all the samples. This indicated that the coercive behavior was controlled by the type of magnetic nanoparticles, but not controlled by the content of magnetic nanoparticles 3 …”

“…In recent years, magnetic composite materials have gained significant attention as a new generation of multifunctional materials 1 that are especially attractive to manufacturers of small motors and actuators for household and automotive use as well as to the audio, video, and computer industries 2 . Magnetic polymeric materials are perhaps the most frequently encountered and widely employed variety of magnetic composite materials, including epoxy resin/M‐type hexaferrite nanocomposites, 3 magnetic cellulose paper/barium hexaferrite, 4 PLA/LNR/NiZn ferrite nanocomposite, 5 Polyaniline/barium ferrite composite, 6 PLA/Fe 3 O 4 melt‐blown nonwoven, 7 and PVDF/barium ferrite composite film, 8 and so on.…”

Investigation of Ferrimagnetic Sr-hexaferrite Nanocrystals for Clinical Hyperthermia

“…M-type hexaferrites are metal oxides with a formula of MFe 12 O 19 . They are frequently utilized as permanent magnets [6]. Apart from the high saturation magnetizations and magneto-crystalline anisotropies, also high intrinsic coercivites; they possess a number of electrical properties as well such as high electrical resistivity, low dielectric loss, low eddy current loss etc [7 -9].…”

Investigating the Effect of Zn Ferrite Nanoparticles on the Thermomechanical, Dielectric and Magnetic Properties of Polymer Nanocomposites

“…Polymer nanocomposites incorporating inorganic nanomaterials with advanced physicochemical properties receive extensive attention due to their unique advantages, which include ease processing and forming, thermomechanical stability, high dielectric breakdown strength and low cost [12,13,14]. Their electromagnetic properties can be altered by embedding suitable reinforcing inclusions and their dielectric and magnetic response can be tuned by controlling the type and the amount of filler content [15,16,17,18,19,20,21]. These unique properties make polymer nanocomposites, especially those filled with magnetic inclusions, suitable for advanced applications in various fields such as chemical sensors, magnetic recording materials, molecular electronic, electric catalysis, electro-magnetic interference (EMI) shielding, rechargeable battery, microwave absorption materials and corrosion protection coatings [2,3,4,5,6,22,23,24].…”