Exchange spring magnetic behavior of Sr0.3Ba0.4Pb0.3Fe12O19/(CuFe2O4)x nanocomposites fabricated by a one-pot citrate sol-gel combustion method

Microstructure, magnetic properties and exchange-coupling interactions for one-dimensional hard/soft ferrite nanofibers

Enhancement on the exchange coupling behavior of SrCo0.02Zr0.02Fe11.96O19/MFe2O4 (M = Co, Ni, Cu, Mn and Zn) as hard/soft magnetic nanocomposites

Fabrication of exchange coupled hard/soft magnetic nanocomposites: Correlation between composition, magnetic, optical and microwave properties

(BaFe12O19)1−x /(Ni0.6Zn0.4Fe2O4)
 x
 magnetic nanocomposites with various molar ratios (x = 0.0, 0.1, 0.2, 0.3) have been synthesized by a physical mixing method at different temperatures (T = 700°C to 900°C) and their structure, morphology, and magnetic properties investigated using x-ray diffraction analysis, Fourier-transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and vibrating-sample magnetometry. The results prove that their magnetic properties were strongly influenced by the sintering temperature as well as the molar ratio of hard to soft phase. The magnetization and switching field distribution curves for the nanocomposites sintered above 800°C showed a single smooth hysteresis loop, suggesting the existence of the exchange spring phenomenon. The variation of the coercivity, saturation magnetization, and ratio of remanence to saturation magnetization (M
 r/M
 s) with the hard-to-soft weight ratio can be explained based on the role of exchange and dipole interactions in the nanocomposites. High maximum energy product (BH)max was obtained for the (BaFe12O19)0.9/(Ni0.6Zn0.4Fe2O4)0.1 sample annealed at 800°C.

Effects of Annealing Temperature on Exchange Spring Behavior of Barium Hexaferrite/Nickel Zinc Ferrite Nanocomposites

Effect of grain size on the effective anisotropy constant between magnetically soft (α-Fe) and hard (Nd2Fe14B) grains in nanocomposite magnets, 〈Ksh〉, has been investigated. The results show that the values of 〈Ksh〉 increase with decreasing size of soft grain, Ds, for the given size of hard grain, Dh. For the given Ds, 〈Ksh〉 increases with increasing Dh, and then approaches a steady value. In order to get a high value of 〈Ksh〉, the hard grain size should be larger than 30 nm and the soft grain size should be about 10 nm.

Effective anisotropy between magnetically soft and hard grains in nanocomposite magnets

Effect of exchange–coupling interaction on the effective anisotropy in nanocrystalline Nd2Fe14B material

Turbulent fluidization and transition velocity of Geldart B granules in a spout–fluidized bed reactor

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Effective anisotropy between magnetically soft and hard grains in nanocomposite magnets

Effect of exchange–coupling interaction on the effective anisotropy in nanocrystalline Nd2Fe14B material

Turbulent fluidization and transition velocity of Geldart B granules in a spout–fluidized bed reactor