Recently, our group explored the combination of self-assembled FePt nanoparticles and atomic layer-deposited Al2O3 capping for fabrication of patterned magnetic nanocomposites with improved the coercivity and stability of FePt nanoparticles under high-temperature annealing [32].
Potentiodynamic polarization measurements for Sm2Fe17N3 magnetic powders in organic solvents with H3PO4 were performed to determine which additives promote passivation in the ball-milling process and improve the coercivity of the ball-milled powders at high temperatures.
The change of H c is largely due to the increasing of the carbon layer thickness, which can weaken the interaction of the dipoles in the Co nanoparticles and improve the coercivity [31, 32].
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As a result, the smaller anisotropy field, compared to the monolayer films, would move the resonant frequency to low frequency, reduce the coercivity, and improve the permeability which fits well with the experiment result.
The major use of dysprosium is as an alloying addition to Nd2Fe14B permanent magnet materials (in which some of the neodymium is substituted with dysprosium) to increase both the Curie point and especially the coercivity and, therefore, improve the high-temperature performance of the alloy.
In addition, it has been widely reported that doping with heavy rare earth elements (Dy or Tb) is a highly useful way to improve the magnetic performance [15, 16], for example, by enhancing the coercivity and thermal stability.
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Appropriate La Co substitution improves the magnetic properties of the ferrites, including the saturation magnetization Ms, effective magnetic anisotropy constant Keff, magnetic anisotropy field Ha, and intrinsic coercivity Hci.
