For Logistics
Packing, destination and delivery terms — discuss the shipment requirements for your order.
Coordinate deliverySoft Magnetic Materials — Cores for Power & Signal
Soft magnetic materials concentrate and shape magnetic fields in transformers, inductors, and chokes. FeSiAl, FeNi, MnZn ferrite, and SMC — matched to your frequency, loss, and cost requirements.
For Procurement
MOQ, lead time, packaging and commercial terms — go straight to a quotation.
Request a QuoteFor Engineering
Grades, drawings, process data and design support for your DFM review.
Material Data & SpecificationsFor Quality / SQE
Certificates, inspection planning, traceability and PPAP / FAI support per project.
Certificates & DocumentationState the Loss-Test Operating Conditions
Select a core or material system using frequency, flux density, temperature and DC bias. A loss or permeability value is meaningful only with its measurement conditions.
- Core geometry, winding and test waveform
- Frequency, B/H amplitude, temperature and DC bias
- Permeability, saturation, core-loss and insulation requirements
Product Range
Soft Magnetic Materials — Product Gallery
Product forms, uses and selection considerations. Final specifications are agreed for each project.
Sendust Toroids
Review frequency, flux density and DC bias.
MnZn Ferrite Cores
Matched shapes for transformer and inductor designs.
High-Permeability Toroids
Toroidal forms for the specified magnetic circuit.
Wound Choke Assemblies
Core and winding considered as one component.
SELECTION GUIDEApplication selection notesExplore applications and requirements
Choosing a Soft Magnetic Material
The right material depends on frequency, loss budget, and cost target:
- ✓MnZn ferrite — the volume leader for switch-mode power supplies — excellent loss at 20kHz–2MHz, low cost, limited by lower saturation (0.4T) and temperature-dependent loss
- ✓FeSiAl (Sendust) — high saturation (1.05T), low loss at 100kHz–1MHz, and low magnetostriction (quiet) — the premium choice for high-efficiency inductors
- ✓FeNi (Permalloy) — very high permeability (μ up to 100,000) — for precision transformers, current sensors, and magnetic shielding
- ✓Soft Magnetic Composites (SMC) — iron powder with insulating coating — 3D flux paths possible, very high saturation (1.5T+), moderate frequency to 100kHz
Applications
| Application | Typical Spec | Why This Material |
|---|---|---|
| SMPS Power Transformers | MnZn ferrite (PC44/PC95) | 50W–5kW switching supplies |
| Wireless Charging Coils | MnZn ferrite + FeSiAl | Qi chargers and EV wireless power |
| PFC Inductors | FeSiAl powder cores | High-efficiency power factor correction |
| Current Sensors | FeNi permalloy | Precision current transformer cores |
| EMI Suppression | MnZn ferrite beads/chips | Common-mode chokes and EMI filters |
Material Comparison
Material datasheets available for download.
| Material | Saturation (Bs) | Max Permeability | Best Frequency | Loss Level | Relative Cost |
|---|---|---|---|---|---|
| MnZn Ferrite | 0.4T | 10,000 | 10kHz–2MHz | Low (grade-dep.) | $ |
| FeSiAl (Sendust) | 1.05T | 80–150 | 1kHz–1MHz | Low | $$ |
| FeNi 50/50 | 1.5T | 100,000 | ≤10kHz | Medium | $$$$ |
| FeNi 80/20 (Mo-p) | 0.8T | 50,000 | ≤100kHz | Medium | $$$$$ |
| SMC (Iron powder) | 1.5T+ | 20–100 | ≤100kHz | Medium | $$ |
| Nanocrystalline | 1.2T | 100,000+ | ≤100kHz | Very low | $$$$ |
Core Geometry Options
We produce cores in standard and custom geometries:
- ✓Standard geometries — EE, ETD, EER, PQ, RM, toroid, pot cores — tooling exists, fastest and cheapest
- ✓Custom geometries — pressed to your drawing (tooling $2k–$10k) — for integrated motor/inverter designs
- ✓Distributed gap — powder cores (FeSiAl, SMC) have distributed air gaps — spreads the gap through the material and can reduce localized fringing; core and winding losses still require evaluation under DC bias
- ✓Laminated assemblies — FeNi and nanocrystalline cores wound from thin tape (20–25μm) — lowest loss for high-frequency transformers
Getting a Quote
For the fastest and most accurate quote, provide:
- ✓Core geometry — drawing (custom) or standard geometry designation (EE25, ETD34, etc.)
- ✓Material grade — from our datasheets, or tell us your frequency and loss target — we'll recommend
- ✓Quantity — prototype and annual volume
- ✓Secondary operations — coating (epoxy/parylene), winding, assembly, or testing requirements
Material Data & Project Review
Use the material-family comparison with the operating conditions below. The separately labeled legacy table is a rare-earth reference and is not a soft-magnetic core datasheet.
For core selection, provide frequency, flux density, temperature, geometry, winding and loss limits. Material-specific curves and test conditions are confirmed for your project; the comparison above is an overview, not an interchangeable-grade approval.
Separate reference: rare-earth powders and compounds
The following legacy reference concerns rare-earth powders and compounds. It is not soft-magnetic core data and must not be used to select permeability, saturation or core-loss performance.
| Product | Purity / Grade | Particle Size | Packaging | Application |
|---|---|---|---|---|
| Ceria Polishing Powder | 99.5-99.9% | 0.5-3.0 μm | 25kg drum / 1MT big bag | Optical glass, semiconductor CMP, precision optics |
| Lanthanum Carbonate | 99.9-99.99% | Powder | 25kg drum | Catalysts, optical glass, FCC catalyst precursor |
| Cerium Carbonate | 99.5-99.9% | Powder | 25kg drum | Auto catalyst, glass decolorizer, UV absorber |
| Yttrium Oxide | 99.99-99.999% | 1-5 μm | 1-25kg vacuum-packed | Phosphors, laser crystals, YSZ ceramics |
| Mixed RE Carbonate | Industrial | Powder | 1MT big bag | Petroleum cracking catalyst, bulk industrial |
Factory Tour
Inside Soft Magnetic Materials Manufacturing
Amorphous and nanocrystalline components use winding, precision finishing, controlled annealing, B-H verification and shaped protective packing.
4 process viewsProduct-specific manufacturing
1 inspection viewRelevant quality equipment
1 packing viewProduct-appropriate protection
End-to-end process visibilityManufacturing · inspection · packing documented in one focused route
Manufacturing processInspection & testingPacking & dispatch
Amorphous Core Winding
Automated winding equipment forms thin alloy strip into transformer cores.
Continuous Thermal Processing
A controlled furnace line supports stable heat treatment across batches.
Protective-Atmosphere Annealing
Atmosphere-controlled cycles develop the required soft-magnetic response.
Precision Core Finishing
Dedicated grinding establishes critical dimensions and mating surfaces.
B-H Curve & Core-Loss Test
A dedicated analyzer measures hysteresis, permeability and frequency-dependent core loss.
Core-Specific Foam Packing
Toroidal cores are separated and cushioned to prevent chipping or winding damage.
Manufacturing, inspection and packing photographs for this product family.Equipment route varies by material and geometryRemote video inspection available before shipment
Frequently Asked Questions
What material should I choose for a 100kHz inductor?
At 100kHz: MnZn ferrite (PC44/PC95) is the standard choice — good loss and lowest cost. If you have high DC bias (inductor carrying significant current), FeSiAl powder cores can offer useful DC-bias performance, but permeability falls with bias and saturation still needs checking. Ferrite inductors often use a discrete gap; include fringing and winding losses in the comparison. Compare candidate grades using the actual frequency, waveform, flux swing, temperature and total component loss.
Can you match a competitor's core?
Yes — send the competitor's datasheet or a sample core. We'll characterize it (permeability, loss curve, saturation) and match the material and geometry. We can also cross-reference standard core designations from TDK, EPCOS, Magnetics Inc., and other major suppliers.
Do you wind cores too?
Yes — we offer winding services with copper magnet wire, Litz wire, and foil. Send your winding specification (turns, wire gauge, insulation class) for a quote on wound components. We also assemble cores with brackets, bobbins, and terminals for complete magnetic component supply.
Quality & Reliability
Lot Traceability
Every batch carries a lot number tied to measured magnetic and electrical properties — permeability, core loss, saturation flux density.
Application Testing
Inductance, Q and loss verified on wound samples or your geometry per the agreed test plan.
Reliability Data
Temperature cycling and humidity stability data available on request for demanding electronics programs.
Define the Measurement Conditions
Specify frequency, flux level and temperature alongside the required properties so results can be compared meaningfully.
Share test requirementsHave a Specification or Core Drawing?
Send it to our engineering team — we'll match the material to your frequency, loss and flux requirements.