permalloyn.
/ˈpəːməlɔɪ/, U.S. /ˈpərməˌlɔɪ/ Any of a series of alloys consisting chiefly of nickel and iron which have very high magnetic permeability and are widely used in electrical equipment, esp. in telecommunications.
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society > occupation and work > materials > derived or manufactured material > metal > alloy > [noun] > iron and nickel
nickel-iron1867
Invar1902
platinite1905
Nife1909
elinvar1921
permalloy1923
perminvar1928
radiometal1932
1923 H. D. Arnold & G. W. Elmen in Jrnl. Franklin Inst. 195 621 For convenience we call these peculiarly magnetic alloys by the general name ‘permalloy’, which serves at the same time to recall their characteristic capability of attaining high initial permeability.
1926 Glasgow Herald 9 Sept. 8/4 The Western Union Telegraph Company announce that the laying of the new permalloy cable between England and New York was successfully completed on Sunday last.
1948 Proc. Symp. Large-scale Digital Calculating Machinery 1947 227 Carefully heat-treated nickel-iron alloys, particularly permalloy and its modifications in the form of well insulated thin laminations, have proved to be most suitable.
1965 Wireless World Sept. 431/1 The auto-transformer core should be of magnetically soft material such as permalloy, mumetal, H.C.R. alloy or some similar grade.
1969 E. N. Simon Dict. Alloys 127 Permalloy 45 contains basically 45 nickel, 55 iron, per cent.
1997 Science 6 Dec. 1630/2 For Permalloy,..the fractional change in resistance when the current changes from being parallel to the internal magnetization to being perpendicular is only a few percent.
This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).
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n.1923