Abstract
A series of nanocrystalline soft magnetic alloys with nominal compositions of Fe66.8-xCo10NixCu0.8Nb2.9Si11.5B8 (x = 1–15 at%) were developed and studied. Effects of annealing on the soft magnetic properties, crystallization behavior, and domain structure were investigated. The alloys with higher Ni content were prone to exhibit stronger magnetic anisotropy. The Fe66.8Co10Ni10Cu0.8Nb2.9Si11.5B8 alloy exhibited excellent soft magnetic properties, including the low permeability of 2000, low coercivity of about 0.6 A/m, and low remanence of 2.4 mT, together with a temperature gap of 128 K between two crystallization onset temperatures. It has been found that the Ni content and the annealing process possess significant effects on the soft magnetic property of the nanocrystalline alloys. It shows that the developed Fe66.8Co10Ni10Cu0.8Nb2.9Si11.5B8 nanocrystalline alloy exhibits great potentials for applying in the field of common mode chokes or current transformers, due to its ability to resist the direct current.
Highlights
FINEMET-type FeCuNbSiB nanocrystalline alloys exhibit excellent comprehensive soft magnetic properties including high saturation magnetic induction Bs, high permeability μ, and low core loss P (Yoshizawa et al, 1988a)
Since FINEMET-type FeCuNbSiB nanocrystalline alloys can be prepared in air at low cost, they are widely used in electronic fields such as high-frequency power transformers, common mode chokes, magnetic amplifiers, and current transformers (Yoshizawa et al, 1988b; Petzold, 2002; Hasegawa, 2004; Herzer et al, 2005; Hasegawa, 2006; Herzer, 2013)
Except for the broad peak corresponding to the amorphous phase, no crystallization peak can be found in the XRD patterns, indicating that the microstructure of the as-cast ribbons is amorphous
Summary
FINEMET-type FeCuNbSiB nanocrystalline alloys exhibit excellent comprehensive soft magnetic properties including high saturation magnetic induction Bs, high permeability μ, and low core loss P (Yoshizawa et al, 1988a). Since FINEMET-type FeCuNbSiB nanocrystalline alloys can be prepared in air at low cost, they are widely used in electronic fields such as high-frequency power transformers, common mode chokes, magnetic amplifiers, and current transformers (Yoshizawa et al, 1988b; Petzold, 2002; Hasegawa, 2004; Herzer et al, 2005; Hasegawa, 2006; Herzer, 2013). It is known that the performance of permeability vs frequency in high-frequency regions could be enhanced by a large anisotropy constant Ku when the coercivity property does not deteriorate. This results in the decreases in permeability attenuation with frequency. The anisotropy constant Ku could be evaluated by Herzer et al (2011)
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