High-frequency power supplies
Frequency, flux density, permeability and core loss.
Soft 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 Quote →For Engineering
Grades, drawings, process data and design support for your DFM review.
Material Data & Specifications →For Quality / SQE
Certificates, inspection planning, traceability and PPAP / FAI support per project.
Certificates & Documentation →Product Range
Soft Magnetic Materials — Product Gallery
Representative product forms for reference. Final geometry, material and finish are agreed for each project.
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 — no gap-loss heating at the gap, ideal for DC-biased inductors
- ✓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
Complete Technical Data
Full reference tables for Soft Magnetic Materials — migrated from our production specification library. Click any row's PDF to download the grade datasheet.
| 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 |
Production & Supply Planning
Soft Magnetic Materials: A Defined Route to Repeat Orders
Agree the process, acceptance criteria and shipment plan before production starts. The quotation identifies the producing site and the controls required for your part.
Confirm the manufacturing route
Select core material, form, finishing and heat-treatment route for the intended excitation and temperature.
Approve the inspection plan
Specify permeability, saturation, core loss and measurement frequency, flux density and temperature.
Qualify before repeat supply
Define sample approval, drawing revision and lot identification. Agree how material, process or site changes will be reviewed before implementation.
Plan releases and delivery
Confirm order quantities, capacity allocation, packaging and shipping terms against your forecast. Delivery dates and any buffer-stock arrangement belong in the agreed supply plan.
Application Engineering
Where soft magnetic materials Fit
Typical component uses and the requirements to discuss before quotation. Suitability depends on your design and validation criteria.
Transformers and energy conversion
Thermal duty, winding geometry and loss at operating conditions.
Automotive power electronics
Switching frequency, insulation and temperature envelope.
Industrial inductors and sensors
Core dimensions, air gap, excitation conditions and sensor response.
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 handle the bias without saturation — ferrite would need a discrete gap, adding gap losses. For very high efficiency, nanocrystalline tape-wound cores offer the lowest losses but at premium cost.
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.
Have a Specification or Core Drawing?
Send it to our engineering team — we'll match the material to your frequency, loss and flux requirements.