When magnetic materials are referred to as “soft”, this refers to the fact that they are soft in the magnetic sense versus the mechanical. Soft magnetic materials retain magnetic field (magnetization) only when they are placed in an external magnetic field. Permanent magnets always keep magnetization and are referred to as “hard”, even if they are mechanically soft, e.g., plastic stickers on refrigerators.

Have more questions? Here are some other related frequently asked questions.

• What are the different types of magnetic flux concentrators?
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