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Permalloy Foil

  • Magnetic field shielding permalloy foil
  • Magnetic field shielding permalloy
  • Magnetic shielding foil

Overview

  • Permalloy, a magnetic field shielding material, has high permeability with excellent magnetic shielding effectiveness.
  • Easy to bend and cut and to process the specific cases as needed.

Features

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

Details


Material Properties

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 [μmax] 350,000
Coercivity [Hc] 20 mOe (15 mA/cm)
Saturation induction, Magnetic flux density [Bs] 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 %


Permalloy PB & PC Properties

Properties PB PC
Nickel 49% 80%
Mass density 8.18 8.7
Electrical resistivity 480μΩ·mm 620μΩ·mm
Curie temperature 449℃ 370℃
Magnetic flux density 15,000Gauss 7,400Gauss
Coercivity 0.1 Oe 0.02 Oe
Max. permeability (AC) 100,000 350,000

PC Hysteresis Curve
Magnetic shielding permalloy


How to shield the magnetic field

Magnetic shielding permalloy

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.

* Note: Due to inherent Permalloy properties, loss of properties may result if direct impact is affected during processing or transport.


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.


  • Permalloy-Foil-Covering-Motor
  • Permalloy-Foil-for-Meter
  • Permalloy-Foil-in-PCB

Equipment sensitive to magnetic wave

Equipment Effect Standard
SEM / E-BEAM Scanning lines from influence of external magnetic wave 2mG
TEM The higher the magnification, the more sensitive to magnetic wave 0.2mG~1mG
SQUID Biomedical ultra-weak self-diagnosis device
MRI Malfunction because of external D.C magnetic wave 2mG

Product Support

Product Number

Magnetic shield permalloy foil
Number Code Example
(1) Product Code SPM
(2) Thickness (T) 010: 0.10mm, 035: 0.35mm



Documentation