Magnetically soft: Materials with easy magnetisability

The term magnetically soft refers to materials that can be easily magnetised and lose their magnetisation just as easily as soon as the external magnetic field is removed. These properties make magnetically soft materials ideal for applications where fast and reversible magnetisation is required.

Properties of magnetically soft materials

• Low coercivity: Magnetically soft materials only require a weak magnetic field to become magnetised and can be easily demagnetised.
• Low hysteresis loss: Due to their narrow hysteresis loop, these materials cause only minimal energy loss during magnetisation cycles.
• High permeability: Magnetically soft materials can conduct magnetic fields efficiently, making them particularly suitable for electromagnetic applications.

Examples of magnetically soft materials

• Soft iron: A material with high permeability that is used in transformers and electromagnets.
• Ferrite: Ceramic materials used in electronic components such as chokes and inductors.
• Permalloy: A nickel-iron alloy used in magnetic heads and electromagnetic shielding.
• Silicon steel: A specially treated iron with low hysteresis loss that is used in transformer laminations.

Comparison: Magnetically soft vs. magnetically hard

Magnetically soft and magnetically hard materials differ fundamentally in their behaviour:

• Magnetically soft: Easy to magnetise and demagnetise, ideal for applications with changing magnetic fields.
• Magnetically hard: Difficult to magnetise, but retain their magnetisation in the long term. Ideal for permanent magnets.

Applications of magnetically soft materials

Magnetically soft materials are indispensable in many technological applications:

• Transformers: They convert electrical energy efficiently by conducting the magnetic field with low losses.
• Electromagnets: Their easy magnetisability makes them ideal for applications such as switches and relays.
• Motors and generators: Magnetically soft cores enable the rapid reversal of magnetic fields and increase efficiency.
• Magnetic shielding: They are used in housings and devices to shield against interfering magnetic fields.

Interesting facts about magnetically soft materials

Did you know that magnetically soft materials play a key role in modern energy technology? Transformers based on silicon steel are a crucial component of power grids as they minimise energy losses and make electrical energy transportable over long distances.