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MuMETAL® Foil/Sheet (Ni80-Fe15-Mo5)
Available Configurations
Properties common to all products in this list
| Size |
|---|
| 10 x 10 mm to 100 x 100 mm |
Need custom configurations? Please contact us.
Key Features
MuMETAL® Alloy Foil (Ni80/Fe15/Mo5) is a soft magnetic foil combining extremely high initial permeability, very low coercivity, and superior shielding effectiveness against low-frequency magnetic fields in a flexible, uniform-thickness sheet:
Extremely High Permeability Against Low-Frequency Magnetic Fields
MuMETAL® achieves initial permeability values among the highest of any commercially available magnetic shielding material in the annealed condition, providing shielding effectiveness against low-frequency magnetic fields substantially superior to silicon steel, grain-oriented electrical steel, or permalloy at comparable thicknesses.
Very Low Coercivity
The very low coercivity in the annealed condition means that MuMETAL® foil is magnetised and demagnetised with minimal hysteretic loss, enabling effective shielding at the very low flux densities encountered in sensitive magnetometer, biomagnetic, and precision navigation instrument environments.
Excellent Flexibility and Uniform Coverage in Layered Shielding Systems
The foil form provides excellent flexibility for conformal wrapping of complex instrument geometries and layered shielding system construction, where multiple foil layers separated by non-magnetic spacers achieve substantially higher shielding factors than a single equivalent-mass sheet.
Microstructure and Grain Orientation Directly Determine Permeability
The permeability and shielding performance of MuMETAL® are directly controlled by grain structure and orientation developed during processing. Controlled rolling texture and hydrogen annealing are essential to achieve the grain alignment that maximises permeability, and mechanical deformation after annealing must be minimized.
Broad Industrial Application Range
MuMETAL® foil is established across aerospace, defence, electronics, and medical technology for transformer shielding, magnetic housings for sensitive sensors, magnetically shielded rooms, and precision scientific instrumentation, with a long track record in demanding shielding applications.
Industrial Applications
MuMETAL® Alloy Foil is used wherever outstanding low-frequency magnetic shielding effectiveness, high permeability, and layered conformal shielding geometry are required in precision instruments and electromagnetically sensitive environments:
- ✦ Transformer Shielding and Magnetic Housings for Sensitive Sensors
- Used for transformer shielding and magnetic housings for sensitive sensors in aerospace, defence, and precision measurement systems, where MuMETAL®’s high permeability intercepts and redirects low-frequency magnetic flux, preventing it from coupling into the shielded sensor or transformer core.
- ✦ Magnetically Shielded Rooms for MEG and Biomagnetic Measurement
- Applied in the construction of magnetically shielded rooms for magnetoencephalography (MEG) and biomagnetic measurement, where multiple layers of MuMETAL® foil combined with mu-metal panels provide the attenuation of environmental magnetic noise required for detection of the femtotesla-range biomagnetic signals generated by neural activity.
- ✦ High-Precision Scientific Instrumentation and Magnetometers
- Used in high-precision scientific instrumentation including gravimeters, atomic clocks, and precision magnetometers, where the extremely low coercivity and high permeability of annealed MuMETAL® foil provide effective exclusion of environmental magnetic interference from the measurement volume.
- ✦ Multilayer EMI Shielding for Low-Noise Electronics
- Applied as multilayer EMI shielding for low-noise electronic circuits and precision analog systems, where the combination of MuMETAL®’s high permeability at low frequencies and the flexibility of the foil form supports conformal layered shielding geometries within constrained electronic instrument enclosures.
- ✦ Microstructure, Grain Orientation and High-Permeability Alloy Processing Research
- Used in research into the relationship between microstructure, grain orientation, processing conditions, and achieved permeability in MuMETAL® and related high-permeability nickel-iron alloys, and for integration studies of MuMETAL® thin-film shielding elements into microelectronic system architectures.
Material Properties
| Element | Value |
|---|---|
| Elongation at break( % ) | 50 |
| Modulus of elasticity( GPa ) | 225 |
| Hardness - Vickers( kgf mm⁻² ) | 115-125 |
| Tensile strength( MPa ) | 500-700 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 55 |
| Temperature coefficient( K⁻¹ ) | - |
| Element | Value |
|---|---|
| Density( gcm⁻³ ) | 8.8 |
| Element | Value |
|---|---|
| Specific heat( J K⁻¹ kg⁻¹ ) | 455@23°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 19@23°C |
Tolerances
| Thickness | <0.01mm | ±25% |
|---|---|---|
| Thickness | 0.01mm - 0.05mm | ±15% |
| Thickness | >0.05mm | ±10% |
| Linear dimension | <100mm | ±1mm |
| Linear dimension | >=100mm | +2 / -1% |