Soft Magnetic Nickel Iron Alloy with alloy composition FeNi80Mo5 – ASTM A 753, DIN 17405, IEC 404, JIS C 2531
‘Domadia Mu-Soft Magnetic Iron Nickel’ is indeed a nickel-iron alloy that exhibits exceptional magnetic shielding properties. It is primarily composed of approximately 77% nickel, 16% iron, 5% copper, and 2% chromium. This combination of elements gives mu-metal its unique magnetic characteristics.
‘Domadia Mu-Soft Magnetic Iron Nickel’ is widely used in various applications where protection against static or low-frequency magnetic fields is required. Its high permeability allows it to efficiently divert magnetic fields away from sensitive electronic equipment, thus preventing interference or distortion in their operation. This makes it particularly valuable in applications such as transformer cores, electromagnetic compatibility (EMC) testing, scientific research, medical equipment, and precision instrumentation.
The exceptional shielding properties of mu-metal stem from its ability to redirect magnetic flux lines within its structure, effectively creating a path of low magnetic reluctance. This results in the attenuation of external magnetic fields and minimizes their impact on the enclosed space.
It’s worth noting that mu-metal is often used in the form of sheets or foils that can be easily shaped and applied to the desired areas. Additionally, other similar alloys with high magnetic permeability, such as Permalloy, are also utilized for magnetic shielding purposes.
Overall, the ability to provide efficient magnetic shielding against static or low-frequency magnetic fields has made it a valuable material in industries where electromagnetic interference must be minimized to ensure proper functioning of sensitive electronic devices.
Here are some examples of mu-metal applications:
- Electric power transformers, where mu-metal shells prevent interference with nearby circuitry.
- Hard disks, which feature mu-metal backings to shield the disk from magnetic fields generated by the drive’s magnets.
- Cathode-ray tubes in analog oscilloscopes, employing mu-metal shields to deflect stray magnetic fields and maintain the electron beam’s accuracy.
- Magnetic phonograph cartridges, using mu-metal cases to reduce interference during LP playback.
- Magnetic resonance imaging (MRI) equipment.
- Magnetometers for magnetoencephalography and magnetocardiography.
- Photomultiplier tubes.
- Vacuum chambers for low-energy electron experiments, such as photoelectron spectroscopy.
- Superconducting circuits, especially Josephson junction circuits.
- Fluxgate magnetometers, compasses, and proximity sensors (inductive type) as part of the sensor systems.
Exceptional magnetic shielding properties make it invaluable for safeguarding equipment and ensuring accurate operation in environments with magnetic field interference.
There are many popular brand names for this alloy – Mumetal, SofMag80, EFI Alloy 79, Permalloy, Permimphy, Hipernom, Aperam, HyMu80
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