Abstract
In the presented work we are focused on the influence of cooling rate on structural and magnetic properties of (Fe78Nb8B14)1-xTbx (x = 0.08, 0.1, 0.12) nanocrystalline bulk alloys. The samples were fabricated using the vacuum suction technique with different cooling rates controlled by different sample diameters (from 0.5 to 1.5 mm). The increased Nb content leads to the formation of specific microstructure and allows obtaining ultra-high coercive alloys just after casting without any additional treatment. The coercivity exceeds 8.6 T at the room temperature in case of optimal chemical and preparation conditions (x = 0.12, d = 0.5 mm) and 5.6 T for x = 0.1. The impact of Tb content as well as the cooling rate on magnetic and structural (XRD, SEM, MFM) properties is widely discussed in the context of reduction of rare earths in the RE-based permanent magnets.
Highlights
It is well known that hard magnetic materials are widely used in various fields of technical industry
One can notice a trend towards searching new hard magnetic materials with a reduced content of rare earth elements or some other systems free of these ingredients with |BH|max parameter in order of 100-200 kJ/m3, which should be sufficient for many applications.[2,3,4,5,6,7,8,9,10,11,12,13]
- In the case of the studies alloys, the increase of the cooling rate leads to the magnetic hardening effect
Summary
It is well known that hard magnetic materials are widely used in various fields of technical industry. Especially important challenge in the field of the permanent magnets is to fill the gap between this alloys.[1] One can notice a trend towards searching new hard magnetic materials with a reduced content of rare earth elements or some other systems free of these ingredients with |BH|max parameter in order of 100-200 kJ/m3, which should be sufficient for many applications.[2,3,4,5,6,7,8,9,10,11,12,13] It seems that the best solution of this challenge may be the composites of soft and hard magnetic phases In this case, strong exchange interactions between magnetic moments associated with the different phases can leads to the so-called spring-magnetism, and in a consequence, combination of high magnetic remanence as well as maximum energy product. In the case of such materials, important meaning has |JH|max parameter (where J is the magnetic polarization, equal to μ0M) which describe the magnetic energy density stored into material and is related to the energy required for its demagnetization
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