Heat generation in the AC magnetic field of fine Y₃Fe₅O₁₂ powder materials prepared by modifying co-precipitation synthesis

Abstract

Fine Y 3 Fe 5 O 12 (YIG) powder with self-heat generation ability in an AC magnetic field was prepared by a modified co-precipitation method and calcined at 6001100°C. Using this method, a single phase of the YIG ferrite structure was obtained at a low calcination temperature. The heat generation ability of the modified synthesis sample with a particle diameter of ³120 nm in a AC magnetic field was significantly improved. The correlation between heat generation ability and hysteresis loss was not confirmed for this sample, which suggests that the heat generation of YIG ferrite powder might have been caused by another factor that differs from the magnetic loss.

Size-Dependent Structural, Magnetic and Magnetothermal Properties of Y3Fe5O12 Fine Particles Obtained by SCS

“…The newly explored applications of this compound are related to several interesting effects arising from the structural distortion caused by the electrical polarizability or hopping charge carriers [8] in the presence of a magnetic field. Another promising effect occurs in fine YIG particles with the redistribution of the spin coupled dipole moments upon the application of an AC magnetic field [9,10]. It results in a functional magnetothermal effect for magnetothermic, ablation [11][12][13][14][15], and photothermal therapy [16] and as a part of organic composite networks [13,17,18].…”

“…The high heat generation ability of submicron YIG particles was demonstrated, but the data related to bacterial activity and toxicity of this compound seems controversial. The results obtained on submicron YIG particles [9], synthesized by colloidal chemistry, possessed high heat generation ability but the origin of the observed behavior remained in question because of the absence of a detailed crystalline and magnetic structure study. Experimental investigation of the real small particles with complex magnetic structures and exchange interactions are very effective with methods that demonstrate sensitivity to the local environment of atoms, crystal, electronic, and spin structure and size effects.…”