69 to 82 % Nickel-Iron

Highest Permeability for Demanding Magnetic Sensor Applications

Nickel-iron materials are characterized by their high permeabilities, which perfectly suits demanding applications where the highest accuracy in magnetic sensing is necessary. Due to their high permeability and the low coercivity, NiFe alloys with a nickel content of 69 % to 82 % are the best choice for these applications.

Benefits:

  • Highest permeability leads to a very high shielding factor
  • Lowest coercivity

MUMETALL® is intended for soft magnetic cores or parts. VACOPERM® 100 and the different grades of ULTRAPERM® have the same alloy composition. They differ in the level of initial and maximum permeability, rising from VACOPERM 100 up to the superior grade ULTRAPERM 250.

MUMETALL and VACOPERM alloys are mainly used in current transformers, magnetic shielding and parts for sensors.

The group of ULTRAPERM alloys is used mainly for high permeability cores, e.g. for differential current transformers in residual current devices (RCDs).

Alloy Strip Solid Material
MUMETALL
VACOPERM 100
ULTRAPERM  

MUMETALL® and VACOPERM® 100 are copper containing alloys with 77%Ni-4,5%Cu-4,5%Mo and the magnetostriction constant λ111 adjusted to zero. The alloys in this group are very soft magnetic materials. They are available in various tape thicknesses as well as in a solid material form. Their characteristic is high output and maximum permeabilities as well as low coercitivity field strengths with saturation polarizations (around 0.7 - 0.8 T). In addition, the shape of the hysteresis loop can be manipulated in very broad limits. For example, it is possible to create circular tape cores with rectangular loops (Z), round loops (R) and flat loops (F).

MUMETALL® is intended for soft magnetic cores or parts. VACOPERM® 100 and the different grades of ULTRAPERM® have the same alloy composition. They differ in the level of initial and maximum permeability, rising from VACOPERM 100 up to the superior grade ULTRAPERM 250.

MUMETALL and VACOPERM alloys are mainly used in current transformers, magnetic shielding and parts for sensors.

The group of ULTRAPERM alloys is used mainly for high permeability cores, e.g. for differential current transformers in residual current devices (RCDs).

Alloy Strip Solid Material
MUMETALL
VACOPERM 100
ULTRAPERM  

MUMETALL® and VACOPERM® 100 are copper containing alloys with 77%Ni-4,5%Cu-4,5%Mo and the magnetostriction constant λ111 adjusted to zero. The alloys in this group are very soft magnetic materials. They are available in various tape thicknesses as well as in a solid material form. Their characteristic is high output and maximum permeabilities as well as low coercitivity field strengths with saturation polarizations (around 0.7 - 0.8 T). In addition, the shape of the hysteresis loop can be manipulated in very broad limits. For example, it is possible to create circular tape cores with rectangular loops (Z), round loops (R) and flat loops (F).

Alloy Saturation Polarisation
Js [T]
Coercivity
HC [A/m]
Permeability
µmax
MUMETALL 0.8 0.12 140,000
VACOPERM 100 0.74 0.25 250,000
ULTRAPERM 0.74 0.08 300,000

 

Alloy Mass Density
ρ [g/cm3]
Electrical Density
ρel [μΩm]
Curie Temperature
TC [°C]
Thermal Conductivity
λ [W/mK]
MUMETALL 8.7 0.55 400 17 - 19
VACOPERM 100 8.7 0.6 500 17 - 19
ULTRAPERM 8.7 0.6 360 17 - 19
Alloy Saturation Polarisation
Js [T]
Coercivity
HC [A/m]
Permeability
µmax
MUMETALL 0.8 0.12 140,000
VACOPERM 100 0.74 0.25 250,000
ULTRAPERM 0.74 0.08 300,000

 

Alloy Mass Density
ρ [g/cm3]
Electrical Density
ρel [μΩm]
Curie Temperature
TC [°C]
Thermal Conductivity
λ [W/mK]
MUMETALL 8.7 0.55 400 17 - 19
VACOPERM 100 8.7 0.6 500 17 - 19
ULTRAPERM 8.7 0.6 360 17 - 19

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Parts and Components

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