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How to explain item magnetic on only ONE side

Removed a set of magnets from an old hard disk. What is unique about these magnets, they are only magnetic on ONE side. The magnet is glued to a piece of ferrous material, but the ferrous material isn't magnetic. How is this done?

Ed Simpson
- Escondido, California, USA
2003

I'm not familiar with the application or technology, but I would assume that the magnet is a very thin disk that is bonded (perhaps autoclaved) to a heavier non-magnetic ferrous material like a 300 series stainless steel.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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