File structures that remain after a file has been deleted

The magnetization left behind in a ferromagnetic material (e.g. iron) after an external magnetic field is removed.

James K. Goldston has written:

'A guide to understanding data remanence in automated information systems' -- subject(s): Information storage and retrieval systems, Security measures, Computer security

D. W. Emerson has written:

'Magnetic exploration models, incorporating remanence, demagnetization and anisotropy HP 41C handheld computer algorithms' -- subject(s): Magnetic prospecting, Data processing

A good permanent magnet should produce a high magnetic field with a low mass, and should be stable against the influences which would demagnetize it. The desirable properties of such magnets are typically stated in terms of the remanence and coercivity of the magnet materials.