Mu-ferro/mu-metal foil

Mu-ferro(mu-metal or Permalloy) foil and tape, is a specialized material designed for effective low-frequency (LF) magnetic field shielding. It is highly valued for its exceptional magnetic permeability and flexibility, making it ideal for various shielding applications.

Key Features

High permeability
Magnetic shielding
Bending, cutting, and attaching double-sided tape are possible.

Custom Manufacturing

Custom Mu-ferro/mu-metal foil

Mu-ferro foil and tape can be customized to meet specific application requirements. Customization options include:

Width and Length: Specify the width up to 150 mm and length up to 100 meters. Custom widths and lengths can be produced upon request to suit particular applications.
Thickness: Depending on the shielding needs, different thicknesses such as 0.005~0.05mm(tolerance within ±5%) can be produced.

Request a Custom Quote

Product Specs

Material Properties

It is a high-permeability alloy primarily used for shielding low-frequency magnetic fields. It typically consists of nickel, iron, copper, and chromium among other metals, with the exact composition adjustable based on various applications.

Properties	Item	Data	Remarks
Magnetic	Saturation polarization	0.74 T	20°C
	Saturation magnetostriction	ca. 1 ppm
	Curie temperature	700°F (370°C)
AC Magnetic	Initial permeability(60Hz) at B=40G [μ(40G)]	100,000
	μ at H= 4mA/cm [μ₄]	250,000
	Max. permeability [μ_max]	350,000
	Coercivity [H_c]	20 mOe (15 mA/cm)
	Saturation induction, Magnetic flux density [B_s]	7,400 G (0.74 T)
Physical	Mass density	8.7 g/cm³	ESQ-612-38
	Electrical resistivity	0.6 x 10^-6 Ohm m
	Coefficient of thermal expansion	13.5 x 10^-6 K^-1	20~100°C
Mechanical	Hardness (HV)	270~420
	Tensile strength	1280 N/mm²	> 0.2mm
	Yield strength	1230 N/mm²
	Elongation	1~3 %

Advantages

Mu-ferro foil works well for shielding low-frequency magnetic fields. Due to the low electrical resistance it shields both low-frequency electric fields (LF) and high-frequency fields (HF). Comparable with Mu-Metal specifications.

Ease of Handling: Easily cut with scissors and applied to various surfaces.
Effective Shielding: Provides up to 14 dB attenuation for LF magnetic fields and up to 100 dB at 1 GHz for HF fields when multiple layers are used.
Versatile Applications: From cable shielding to large-area applications in military and aerospace industries.

Applications

Cover the magnetic field parts with permalloy foil, or protect the sensor from external magnetic fields by inserting the sensor control in the permalloy case.

Electronic Devices: Prevents EMI in sensitive components and systems.
Medical Equipment: Essential in MRI machines and other diagnostic devices to minimize external magnetic interference.
Aerospace and Automotive: Used to shield critical avionics and automotive electronics.
Research and Development: Utilized in scientific instruments like electron microscopes and magnetic sensors for accurate readings.

Dimensions Measurement Guide

Mu-ferro foil is a thin foil; its thickness is only 0.005~0.05mm, tolerance within ±5%. It combines excellent soft magnetic properties with unusual mechanical hardness and flexibility. This means that tight bends can be realised with only very slight impairment of permeability. The fine strip thickness and comparatively low electrical conductivity permit effective shielding even of higher-frequency fields. The roll can be ordered ordered up to 100 meter in length and a width up to 50 meter.

How to shield the magnetic field

It is most effective to enclose the source or affected parts of the magnetic field shield completely. Still, the shielding effect can be obtained even if only the specific part is covered or the cover type is installed, as shown above.

When you wrap a cylindrical shape or cover a rectangular housing, be careful not to make a gap between the joint and between the body and the lid.