【摘 要】
：
The demagnetization curves were calculated using micromagnetic finite-element method for nanocomposite Pr2Fe14B/α-Fe permanent magnets with precipitate-typed m
【机 构】
：
State Key Laboratory of Magnetism
论文部分内容阅读
The demagnetization curves were calculated using micromagnetic finite-element method for nanocomposite Pr2Fe14B/α-Fe permanent magnets with precipitate-typed microstructure. Due to intergrain exchange coupling, both remanence enhancement and a single magnetic phase behavior in demagnetization curve were found. For the samples with the hard phase as the precipitate and the soft one as the matrix, a coercivity μ0Hc of 0.78 T, a remanence Jr of 1.18 T and a large energy product(BH)max of 200 kJ·m-3 are obtained for the sample with hard grain size being 23 nm. While, for the sample with the soft phase as the precipitate, μ0Hc of 0.95 T, Jr of 1.24 T and(BH)max of 240 kJ·m-3 are obtained for the sample with soft grain size being 10 nm. The calculating results were compared with the experimental Pr8Fe87B5 ribbons. The dependence of remanence and coercivity on the microstructure was discussed extensively.
其他文献
A series of catalysts were prepared by using complex sol-gel methods.Experimental results confirm the effect of different agents on structure and activity of Fe
SrAl2O4: Eu2+, Dy3+ nano-particle luminescence material was prepared by sol-gel method. Influences of synthesis conditions on the particle size and luminescence
Low-temperature-epitaxy n-type silicon layers were grown on arsenic-doped n+-type silicon substrate by using ultra-high vacuum chemical vapor deposition (UHV/CV
Nanostructured WC-12Co coatings were deposited by high velocity oxy-fuel (HVOF) spraying with an agglomerated powder. The effect of flame conditions on the micr
The importanCe of rare earths being applied in the catalyst for cleansing the exhaust gas out of car was introduced. The acting mechanism of ceria and lanthana
Most of the up-conversion lasers operated at room temperature are realized with heavy metal fluorides, In this paper the Judd-Ofelt parameters Ωλ ( λ = 2,4,6
该文从挂篮荷载计算、施工流程、支座及临时固结施工、挂篮安装及试验、合拢段施工、模板制作安装、钢筋安装、混凝土的浇筑及养生、测量监控等方面人手,介绍了S226海滨大桥
Fermentation experiments to produce validamycins from crude substrates by Streptomyces hygroscopicus were carried out in an external-loop airlift bioreactor (0.
A novel topological index WF is defined by the matrices X, W and L as WF = XWL. The topological index WF based on the distance-related matrix of molecular graph
Nanocomposites α-Fe/Fe3B/Y2O3 were prepared by a melt-spun technique, and the electromagnetic wave absorption properties were measured in the 0.05～20.05 GHz ran