Abstract
We present the evolution of magnetic anisotropy obtained from the magnetization curve of (Fe0.76Si0.09B0.10P0.05)97.5Nb2.0Cu0.5 amorphous and nanocrystalline alloy produced by a gas atomization process. The material obtained by this process is a powder exhibiting amorphous character in the as-atomized state. Heat treatment at 480 °C provokes structural relaxation, while annealing the powder at 530 °C for 30 and 60 min develops a fine nanocrystalline structure. Magnetic anisotropy distribution is explained by considering dipolar effects and the modified random anisotropy model.
Highlights
FeSiBPNbCu amorphous alloys have recently attracted attention owing to the possibility being used as inductors and other reactors in electromagnetic devices, etc. [1,2,3,4]
We present the evolution of magnetic anisotropy obtained from the magnetization curve of (Fe0.76Si0.09B0.10P0.05)97.5Nb2.0Cu0.5 amorphous and nanocrystalline alloy produced by a gas atomization process
Analysis of the Gaussian anisotropy field distribution of amorphous and nanocrystalline (Fe0.76Si0.09B0.10P0.05)97.5Nb2.0Cu0.5 alloy obtained by the gas atomization process is reported
Summary
FeSiBPNbCu amorphous alloys have recently attracted attention owing to the possibility being used as inductors and other reactors in electromagnetic devices, etc. [1,2,3,4]. It has been recently demonstrated that SMCs, fabricated from nanocrystalline, well-insulated particles with a particle size below 20 μm, exhibit exceptional power loss behavior at high frequency (>1 MHz) [9,10] These alloys can exhibit excellent soft magnetic character in the nanocrystalline state, which is developed by submitting the amorphous precursor to careful thermal treatments (typically around 550 ◦C between 30 and 60 min). The soft magnetic behavior of Fe-based nanocrystalline alloys has been successfully explained within the framework of the random anisotropy model (RAM) proposed for amorphous alloys [13], where the anisotropy of nanograins is averaged out and the effective anisotropy has a very low value This situation is favorable for achieving good soft magnetic properties in the case of nanocrystalline materials [14]. In this work the magnetic anisotropy of the (Fe0.76Si0.09B0.10P0.05)97.5Nb2.0Cu0.5 amorphous and nanocrystalline alloy produced by the gas atomization process is analyzed in depth
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