Quick AnswerFor 1–100MHz power applications, evaluate core loss density, permeability stability, saturation flux density and cost. FeNi metal alloy cores offer Bs ≥1.5T with stable permeability for MHz metal inductors; ferrite fits low-power >500kHz designs; Sendust and MPP suit mid-frequency EMI and filter roles. Define frequency, current, temperature and loss budget before choosing.
The switching frequency of power electronics keeps climbing — AI GPU VRMs, server power, and compact chargers now operate in the 1–100MHz range. At these frequencies the magnetic core, not the copper winding, usually sets the limit of efficiency and size. Here is a practical selection method.
| Property | FeNi (Iron Nickel) | Ferrite | Sendust | MPP |
|---|---|---|---|---|
| Saturation Bs | ≥1.5T | 0.3–0.5T | ~1.05T | ~0.75T |
| Permeability range | 14–160 | 300–15000 | 26–125 | 14–550 |
| Core loss @100kHz | ≤300 kW/m³ | Very low (<100kHz–1MHz) | Moderate | Low |
| Temp stability | Excellent (−40 to +180°C) | Fair (Curie limit) | Good | Good |
| Typical use | MHz metal inductors, AI GPU VRM, EV | Low-power HF, transformers | EMI filters, PFC | Filters, precision inductors |
AI GPU and server power rails need high current at high frequency without saturation. FeNi powder cores combine Bs ≥1.5T with a distributed air gap, so inductance remains stable under heavy DC bias while core loss stays bounded at MHz switching. That is why YUTE’s MHz metal inductors (1–100MHz, 0.047–6.8µH) target AI accelerators such as H100 and B200.
YUTE Magnetics offers free technical evaluation of core material selection. Send your frequency, current and size targets and our engineers will respond within 24 hours.
Dive deeper into Fe-Ni material properties and the YTFN series in our High Flux Cores Guide, or compare ferrite options in the Ferrite Core Guide.
Our engineering team responds within 24 hours with a free technical evaluation.
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