One of the mysteries of the English language finally explained.
An alloy of nickel and iron that is easily magnetized and demagnetized, used in electrical equipment.
- ‘He and his colleagues deposited exquisitely thin loops of an easily magnetized nickel-iron compound called permalloy onto silicon wafers.’
- ‘The readback portion of the head is a conventional permalloy shielded, bottom spin valve sensor.’
1920s: from permeable + alloy.
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