77 to 82 % Nickel-Iron
Highest Permeability for Demanding Magnetic Sensor and Shielding 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
Due to their high permeability’s 77 - 82 wt% Nickel-Iron alloys are mainly used in magnetic shielding and high sensitivity (current) sensors. Frequently they are also employed in transformer cores. Furthermore they find application in relay parts for very sensitive residual current devices (RCDs) where the high nickel content is also beneficial to reduce potential corrosion formation that may degrade the device’s functional characteristics.
Solid material 77 - 82 wt% Nickel-Iron alloys are often used for magnetic flux guiding and shielding, e.g. in particle optics systems.
| Alloy | Strip | Solid Material |
|---|---|---|
| MUMETALL | ✔ | ✔ |
| VACOPERM 100 | ✔ | ✔ |
| ULTRAVAC | ✔ | ✔ |
MUMETALL®, VACOPERM® 100 and ULTRAVAC® 80 are all soft magnetic alloys with 77-80 wt% Ni, where by a combination of alloying elements and closely controlled annealing procedures it is possible to tune both the magnetostriction constant λ111 and the magnetic crystalline anisotropy K1 to zero. While MUMETALL and VACOPERM 100 are copper containing alloys with 4.5 wt% Cu and 3 to 4 wt% Mo, ULTRAVAC 80 is a copper-free variant, containing only about 5 wt% Mo as an alloying element.
The highest initial permeabilities are reached by an adjusted tempering treatment after the high temperature annealing of the alloy, controlling the degree of elemental ordering on the Ni-Fe sublattice.
ULTRAVAC 816 is a copper-free alloy that has been optimized to exhibit a round hysteresis loop that is correlated with high initial permeability without the need of an additional tempering treatment. The saturation magnetization of this alloy is slightly lower than the one of MUMETALL, VACOPERM 100 and ULTRAVAC 80.
Due to their high permeability’s 77 - 82 wt% Nickel-Iron alloys are mainly used in magnetic shielding and high sensitivity (current) sensors. Frequently they are also employed in transformer cores. Furthermore they find application in relay parts for very sensitive residual current devices (RCDs) where the high nickel content is also beneficial to reduce potential corrosion formation that may degrade the device’s functional characteristics.
Solid material 77 - 82 wt% Nickel-Iron alloys are often used for magnetic flux guiding and shielding, e.g. in particle optics systems.
| Alloy | Strip | Solid Material |
|---|---|---|
| MUMETALL | ✔ | ✔ |
| VACOPERM 100 | ✔ | ✔ |
| ULTRAVAC | ✔ | ✔ |
MUMETALL®, VACOPERM® 100 and ULTRAVAC® 80 are all soft magnetic alloys with 77-80 wt% Ni, where by a combination of alloying elements and closely controlled annealing procedures it is possible to tune both the magnetostriction constant λ111 and the magnetic crystalline anisotropy K1 to zero. While MUMETALL and VACOPERM 100 are copper containing alloys with 4.5 wt% Cu and 3 to 4 wt% Mo, ULTRAVAC 80 is a copper-free variant, containing only about 5 wt% Mo as an alloying element.
The highest initial permeabilities are reached by an adjusted tempering treatment after the high temperature annealing of the alloy, controlling the degree of elemental ordering on the Ni-Fe sublattice.
ULTRAVAC 816 is a copper-free alloy that has been optimized to exhibit a round hysteresis loop that is correlated with high initial permeability without the need of an additional tempering treatment. The saturation magnetization of this alloy is slightly lower than the one of MUMETALL, VACOPERM 100 and ULTRAVAC 80.
|
Strip Material |
Saturation Polarization Js [T] |
Coercivity HC [A/m] |
Max. Permeability1 μmax |
Max. Permeability2 μmax |
Initial Permeability1 μ0.1A/m |
Initial Permeability2 μ0.1 A/m |
| MUMETALL | 0.78 | 0.6 | 500,000 | 240,000 | 45,000 | 90,000 |
|---|---|---|---|---|---|---|
| VACOPERM 100 | 0.74 | 0.6 | 350,000 | 240,000 | 70,000 | 90,000 |
| ULTRAVAC 80 | 0.75 | 0.6 | 400,000 | 240,000 | 65,000 | 90,000 |
| ULTRAVAC 816 | 0.74 | 0.6 | 210,000 | - | 90,000 | - |
1after recommended heat treatment with typical cooling rate 50K/h
2after recommended heat treatment and additional tempering with recommended conditions
|
Bulk Material |
Saturation Polarisation |
Coercivity |
Max. Permeability |
Initial Permeability1 |
|---|---|---|---|---|
| MUMETALL | 0.78 | 0.6 | 500,000 | 45,000 |
| VACOPERM 100 D | 0.74 | 0.6 | 350,000 | 70,000 |
| ULTRAVAC 80 D | 0.75 | 0.6 | 400,000 | 65,000 |
1after recommended heat treatment with typical cooling rate 50K/h
| Alloy | Mass Density ρ [g/cm3] |
Electrical Resistivity ρel [μΩm] |
Curie Temperature TC [°C] |
Thermal Conductivity (25 °C) λ [W/mK] |
|---|---|---|---|---|
| MUMETALL | 8.7 | 0.6 | 400 | 18 - 20 |
| VACOPERM 100 | 8.7 | 0.6 | 360 | 18 - 20 |
| ULTRAVAC 80 | 8.7 | 0.6 | 370 | 18 - 20 |
| ULTRAVAC 816 | 8.7 | 0.6 | 360 | 18 - 20 |
|
Strip Material |
Saturation Polarization Js [T] |
Coercivity HC [A/m] |
Max. Permeability1 μmax |
Max. Permeability2 μmax |
Initial Permeability1 μ0.1A/m |
Initial Permeability2 μ0.1 A/m |
| MUMETALL | 0.78 | 0.6 | 500,000 | 240,000 | 45,000 | 90,000 |
|---|---|---|---|---|---|---|
| VACOPERM 100 | 0.74 | 0.6 | 350,000 | 240,000 | 70,000 | 90,000 |
| ULTRAVAC 80 | 0.75 | 0.6 | 400,000 | 240,000 | 65,000 | 90,000 |
| ULTRAVAC 816 | 0.74 | 0.6 | 210,000 | - | 90,000 | - |
1after recommended heat treatment with typical cooling rate 50K/h
2after recommended heat treatment and additional tempering with recommended conditions
|
Bulk Material |
Saturation Polarisation |
Coercivity |
Max. Permeability |
Initial Permeability1 |
|---|---|---|---|---|
| MUMETALL | 0.78 | 0.6 | 500,000 | 45,000 |
| VACOPERM 100 D | 0.74 | 0.6 | 350,000 | 70,000 |
| ULTRAVAC 80 D | 0.75 | 0.6 | 400,000 | 65,000 |
1after recommended heat treatment with typical cooling rate 50K/h
| Alloy | Mass Density ρ [g/cm3] |
Electrical Resistivity ρel [μΩm] |
Curie Temperature TC [°C] |
Thermal Conductivity (25 °C) λ [W/mK] |
|---|---|---|---|---|
| MUMETALL | 8.7 | 0.6 | 400 | 18 - 20 |
| VACOPERM 100 | 8.7 | 0.6 | 360 | 18 - 20 |
| ULTRAVAC 80 | 8.7 | 0.6 | 370 | 18 - 20 |
| ULTRAVAC 816 | 8.7 | 0.6 | 360 | 18 - 20 |
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Related Products
40 % to 50 % Nickel-Iron
Alloys with a Ni-content of around (40...50) wt% are characterized by a maximum in the saturation polarisation of up to JS = 1.6 T and a medium range permeability. By selecting appropriate rolling and annealing conditions, the shape of the magnetization curve can be varied over a wide range.
Soft Magnetic Stamped Parts
All crystalline alloys can be processed further to stamped parts. VAC has state-of-the-art facilities for punching, deep-drawing and further processing methods like interlocking or wire-EDM.
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Our soft magnetic nickel-iron alloys are designed for cores or parts. They are used in current transformers, magnetic shields and parts for sensors.
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