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Magnetics' Kool Mu material in particular offers significantly lower core losses lower than powdered iron (Figure 4), near zero magnetostriction, and no thermal aging.
Alloy powder cores offer similar DC bias characteristics when compared to powdered iron (pure Fe composition), see Figure 5. In addition to withstanding a DC bias, switching regulator inductors see some AC current, typically at 10 kHz to 300 kHz. This AC current produces a high frequency magnetic field, which creates core losses and increases core temperature. This effect is lessened with Kool Mu, making inductors more efficient and cooler.
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