demagnetize the magnetic head

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Magnetic-particle inspection — (MPI) is a non destructive testing (NDT) process for detecting surface and subsurface discontinuities in ferroelectric materials such as iron, nickel, cobalt, and some of their alloys. The process puts a magnetic field into the part. The piece… … Wikipedia
Preservation of magnetic audiotape — There are multiple types of magnetic media, however this article focuses on recommended best practices for handling, cleaning and storage of magnetic audiotapes in an archival repository, either in the form of open reels or enclosed cassettes.… … Wikipedia
Cassette demagnetizer — A cassette demagnetizer is a device that removes the magnetic charge that is built up from the use of audio cassettes in a cassette deck. Over time, the passage of magnetically charged cassette tape over the metallic parts of the tape deck will… … Wikipedia
electromagnet — /i lek troh mag nit/, n. a device consisting of an iron or steel core that is magnetized by electric current in a coil that surrounds it. [1815 25; ELECTRO + MAGNET] * * * Device consisting of a core of magnetic material such as iron, surrounded… … Universalium

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