The pulse-thermal processing of NdFeB-based nanocomposite magnets

Boron and its Compounds in New Energy and Materials Fields

“…Li et al [6] investigated the corrosion behavior of NdFeB magnets and found that the external scales of NdFeB oxidation were F 2 O 3 and F 3 O 4 , but the principal degradation process was internal oxidation. Yu et al [7] found that intrinsic coercivity of NdFeB magnets was promoted, and whilst remanence was reduced resulting from the addition of Dy and Nb into magnets. The optimum magnetic property was achieved when 1.0 % Dy and 1.5 % Nb combined.…”

Rapid thermal annealing of FePt nanoparticles

“…The RTA induced magnetic hardening within several seconds for other magnetic materials was also observed and discussed in other reports. [23][24][25] This phenomenon may be explained by a lowered phase transition temperature in RTA treated samples. Figure 5 shows the demagnetization curve of the 8 nm FePt particles annealed at 650°C for 10 s by RTA as an example.…”

Pulsed laser deposition and annealing of Dy–Fe–B thin films on melt-spun Nd–Fe–B ribbons for improved magnetic performance

“…A recent investigation reveals that heating time greater than 1 s is required to promote complete crystallization in amorphous NdFeB ribbons and thereby achieve a high degree of magnetic hardening [4]. In another study on pulsethermal processing of an NdFeB-based nanocomposite magnet utilizing high-density plasma arc lamp technology, annealing time as short as 0.5 s initiates the crystallization transition from an amorphous phase to magnetic nanocomposite, while prolonged processing is required for optimization of magnetic hardening in the ribbons [26]. Furthermore, the optimization of magnetic properties is usually achieved in a very narrow window of RTA parameters.…”