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Nanocrystalline soft magnetic material is a fairly new development. The material composition is 82% iron with the remaining balance silicon, boron, niobium, copper, carbon, molybdenum, and nickel. The raw material is manufactured and supplied in an amorphous state. It is recrystalized into a precise mix of amorphous and Nanocrystalline phases when annealed, giving the material it's unique magnetic properties

Nanocrystalline soft magnetic cores

1. With advanced surface coating technique made of epoxy resin, we can produce nanocrystalline cores with excellent mechanical stress magnetic stability. Cores weighed 50g are dropped down the ground from 1 meter high level, the cores will not break and the permeability and coercivity remain unchanged.
2. Impulse current withstand: when the cores are tested in voltage independent RCCBs with 3000A impulse current, their irreversible loss for permeability is less than 3%.
3. Because of the excellent mechanical stress magnetic stability for the cores, the use of cores in transformers for IGBT inverter electric welder will greatly reduce the operating noise and can serve more than 20 years.
4. Temperature magnetic stability: after aging at -25^oC for 100 hours and 120^oC for 100 hours, the irreversible loss for permeability is less than 2% and less than 3%.

1. The real part of complex permeability (μ_r' .) at lOOkHz and 20^oC reaches more than twice as high as that of Mn-Zn ferrite cores. The impedance relative permeability (μ_rz) including imaginary part of complex permeability (μ_r") reaches more than four times as high as that of Mn-Zn ferrite cores. Consequently, the cores shows following benefits when compared with a same size Mn-Zn ferrite core (Table 1, Figure 1, Figure 2).
• It allows four times higher impedance when applied to the number of winding turns.
• Nanocrystalline can be reduced to 1/2 winding turns to obtain same impedance value as a Mn-Zn ferrite core in low frequency. Consequently, it reduces stray capacitance significantly. As a result, impedance in high frequency range becomes large.
2. Frequency dependence of initial permeability (μ_r',) is not significantly affected by temperature change. Consequently, common mode chokes with Nanocrystalline cores have low temperature dependence of inductance and impedance over a wide frequency and temperature range (Figure 3, Figure 4).