Soft Magnetic Alloys and Their Properties

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soft magnetic alloys and Their Properties

FAQ for Materials

Q.1. What Effect Does Heating The Magnetic Material Have?

• Ans. Magnetic materials properties are temperature dependent. When temperature rises the magnetic interaction in the materials reduces due to thermal energy enhancement. When thermal energy overcomes the magnetic energy , magnetic property will reduce drastically or become zero.

Q.2. What is MuMetal? Where can it be used?

• Ans. MuMETAL®, Co-NETIC® AA and other shielding alloys, offer important electromagnetic field shielding characteristics, including very high magnetic permeability - its ability to absorb magnetic energy. The unique properties of this family of alloys results in the highest possible attenuation, making these shielding alloys the materials of choice for reducing low-frequency electromagnetic interference (EMI).

Q.3. Why is Mu Metal offered?

• Ans. MuMETAL® is an industry reference material, with different characteristics than proprietary alloys. MuMETAL® meets specs 1J79, MIL-N-14411C Composition 1 and ASTM A-753 Alloy 4. When the specification or the application calls for a magnetically soft or high permeability material, MuMETAL® can frequently be successfully applied.

Q.4. Why must MuMetal® alloy be final annealed to develop magnetic shielding performance?

• Ans. To obtain optimum magnetic properties, annealing MuMetal® alloy following fabrication is essential. This should be done in a furnace that allows for careful control of the annealing temperature and cooling rate. Optimum properties are reached in a pure hydrogen atmosphere.

Q.5. Why does MuMetal or Co-Netic not be used at cryogenic temperature?

• Ans. High permeability MuMETAL® and Co-NETIC® alloys have an optimal temperature range in which the permeability peaks. The permeability of these alloys begins to drop below -40°C, making it unsuitable in low temperature applications.

Q.6. What are the limitations on using Cobalt Iron material?

• Ans. The main limitation of the material is its high core loss at 50 Hz when compared with other soft magnetic materials.

Q.7. Why is coating required for parts made from SiFe material?

• Ans. SiFe materials are more prone to corrosion hence, to avoid corrosion, rusting or oxidation, coating is highly recommended for SiFe materials based components