Amorphous and nanocrystalline (FeSiBPCu) powder for 5-500 kHz inductors, wireless charging and EMI cores. XRD-certified amorphous fraction, lot loss data, no rare earths.
QUICK ANSWER
FeSiB-based amorphous and nanocrystalline powders are iron-boron-silicon alloys (with Cu/Nb additions in nanocrystalline grades, e.g. FeSiBPCu) rapidly solidified into powder whose atomic structure is glassy or nano-grained — delivering core losses a fraction of crystalline iron powder at 10-100 kHz. They serve high-frequency inductors, wireless power transfer, and EMI suppression where conventional powder cores generate too much heat.
Amorphous metals freeze without crystal structure, eliminating magnetocrystalline anisotropy and slashing hysteresis loss; nanocrystalline alloys add a controlled crystallization of ~15 nm grains in an amorphous matrix for near-zero magnetostriction with high permeability. In ribbon form these materials transformed distribution transformers; in powder form — made by gas atomization with extreme cooling or by milling ribbon — they bring the same loss advantage to pressed and molded geometries. The technical challenge is fragility and stress sensitivity: powder pressing and insulation must avoid degrading the glassy structure, which is why powder morphology and process know-how carry the value.
MATERIAL DATA
Lot-level controls focus on the chemistry, particle characteristics, and process values that influence manufacturing consistency and finished-part performance.
| Element | Content | Performance Role |
|---|---|---|
| Iron (Fe) | Balance (~75-85 wt%) | Ferromagnetic base |
| Silicon (Si) | 5-10 wt% | Glass former and resistivity raiser |
| Boron (B) | 2-8 wt% | Primary glass-forming element enabling amorphization |
| Phosphorus/Copper/Niobium | 0-5 wt% (nanocrystalline grades) | Cu triggers nanocrystallization; Nb/P refine grain size |
| Oxygen (O) | < 1000 ppm | Oxide disrupts glass formation and raises loss |
Final limits can be aligned with the agreed purchase specification.
APPLICATIONS
High-frequency power magnetics are the core market: inductors and transformers in server power supplies running wide-bandgap switches, wireless charging coils for EVs and consumer devices, and high-frequency PFC stages all chase the loss advantage of amorphous/nanocrystalline materials. Powder cores and molded parts extend this advantage into geometries that ribbon wound cores cannot fill — gapped E-cores, pot cores, toroids with distributed gap, and integrated molded magnetics. Buyers are magnetics manufacturers with ribbon experience branching into powder parts, and they buy on certified loss data at their exact test conditions.
EMI suppression is the second market: amorphous and nanocrystalline powder pressed or loaded into composites makes common-mode choke cores and absorption sheets with extreme permeability at noise frequencies. Data center, automotive, and industrial drive applications all need ever-smaller EMI filters, and the permeability of nanocrystalline material at 100 kHz-1 MHz is unmatched by ferrite — enabling smaller cores that fit shrinking power electronics enclosures.
SOFT MAGNETIC & MAGNETIC MATERIAL POWDERS
CUSTOM SUPPLY
We supply FeSiB-based amorphous atomized powder, nanocrystalline (FeSiBPCu-type) powder, and milled ribbon flake with certified amorphous fraction (XRD data) and core loss at standard points. Custom compositions for specific permeability-loss targets, flake aspect ratios for absorption composites, and process guidance for low-degradation pressing are available. Not export-controlled (iron-based; contains no controlled rare earths).
We supply FeSiB-based amorphous atomized powder, nanocrystalline (FeSiBPCu-type) powder, and milled ribbon flake with certified amorphous fraction (XRD data) and core loss at standard points.
Custom compositions for specific permeability-loss targets, flake aspect ratios for absorption composites, and process guidance for low-degradation pressing are available.
MATERIAL COMPARISON
| Comparison Point | This Product | Sendust |
|---|---|---|
| Core loss at 50 kHz | Dramatically lower | Moderate |
| Saturation flux density | 1.2-1.6 T | ~1.05 T |
| Pressing tolerance | Sensitive — stress degrades µ | Robust |
| Cost | High | Moderate |
| Permeability (nanocrystalline) | Very high available | 26-125 µ |
| Best use | Loss-critical, high-frequency magnetics | Volume power chokes, cost-sensitive |
TECHNICAL FAQ
Need a different chemistry, particle range, or processing route? Our material team can review the requirement and supply window.
Significantly if done wrong — high pressure induces stress that raises hysteresis loss. Low-pressure compaction with compliant binders and stress-relief annealing below crystallization temperature preserves most of the advantage. We provide process windows with each grade.
Amorphous for lowest loss at high flux swing (inductors); nanocrystalline for maximum permeability (EMI, common-mode chokes, sensing). If your spec is attenuation per volume, nanocrystalline usually wins.
Any crystalline content in the powder raises loss and permeability variance. We certify amorphous fraction by XRD per lot — >95% amorphous is our standard atomized grade.
Yes — polymer-bonded amorphous powder composites serve low-pressure molding for complex EMI and sensor parts, trading some permeability for total geometry freedom.
No — these are iron-metalloid alloys containing no rare earths. They ship without licensing requirements.
RELATED PRODUCTS
Compare neighboring grades from the same material family, then review the complete category for additional chemistry and particle options.
50Ni-50Fe soft magnetic powder for current transformer cores, RCD toroids and magnetic shielding. Spherical and flake forms, Mo-bearing high-µ variants, lot test-ring data.
Gas-atomized sendust (Fe-9.6Si-5.4Al) powder for 26-125µ power cores. 1.05T saturation, low loss to 200 kHz, certified lot core-loss data. EV charger and solar inductor grades.
Spherical FeSiCr powder, D50 10-25µm, for MHz molded power inductors. Cr-passivated for 85/85 humidity life. Custom Si/Cr ratios and coated grades.
REQUEST THIS GRADE
Share your target chemistry, particle size, process, annual volume, and destination. Our powder specialists will confirm the closest production grade and documentation package.
