NdFeB
Highest energy density available in commercial production. A common choice for EV traction motors and robot joint actuators where mass and volume are constrained.
- Energy product
- Highest
- Temp. stability
- Grade-dependent
MAGNETIC MATERIALS · JAPAN
Aligned for
electrification.
MJC Materials provides magnetic material solutions for engineering teams building the next generation of energy and motion systems.
Based in Japan · Serving global markets
PRODUCT DETAILS
Six families, one selection logic.
Every material family trades energy density against temperature stability, corrosion behaviour, geometry, and cost. Start from the constraint that cannot move.
SmCo
Retains magnetisation where NdFeB will not. Selected when ambient or self-heating pushes the magnet beyond the reach of neodymium grades.
- Energy product
- High
- Temp. stability
- Excellent
Ferrite
Low cost per unit volume and inherently corrosion resistant. Where the magnetic circuit has room, ferrite reduces rare-earth exposure and coating requirements.
- Energy product
- Low
- Corrosion
- Inherently resistant
AlNiCo
Very low reversible temperature coefficient. Used where the output signal must stay stable across a wide temperature band, including sensors and instrumentation.
- Energy product
- Low
- Temp. coefficient
- Lowest
Bonded magnets
Injection or compression moulded to net shape, with multipole magnetisation applied in one operation. Suitable for complex rotor geometries.
- Geometry
- Net shape
- Magnetisation
- Multipole
Magnet assemblies
Magnets bonded, retained, or over-moulded into rotor and stator sub-assemblies, supplied magnetised or unmagnetised to drawing.
- Scope
- Project-specific
- Drawing-based
- Yes
SELECTION GUIDE
Compare the first constraints.
Begin with the required energy density and maximum operating temperature, then refine the selection against geometry, environment, and cost.
Selection guide
BHmax / Tmax
| Family | BHmax (kJ/m³)† | Tmax (°C)† |
|---|---|---|
| NdFeB | 239–415 | 80–230 |
| SmCo | 128–240 | 250–350 |
| Ferrite | 6.5–42 | 200–250 |
| AlNiCo | 10–72 | 450–550 |
† Industry-typical reference ranges for initial comparison only. These are not MJC product specifications or guaranteed values.
OUR FOCUS
Materials for industries in motion.
We focus on applications where magnetic performance, reliability, and technical communication matter.
Green energy
Magnetic material solutions for efficient energy generation and conversion.
Electric vehicles
Material support for the demanding thermal and magnetic requirements of e-mobility.
Robotics
Magnetic solutions for compact, responsive, and precise motion systems.
OUR APPROACH
Clear requirements. Reliable communication.
01
Engineering-led dialogue
We begin with application requirements and the conditions that define performance.
02
Global perspective
Based in Japan, with a particular focus on Southeast Asia and the United States.
03
Responsible information
Technical specifications are communicated with clear scope and traceable documentation.
START A CONVERSATION
Tell us about your application.
For product enquiries, technical discussions, and commercial requests, contact our sales team.