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Amikam Aharoni says in his book, ( ISBN  9780198517917), that the technique was first suggested by Arrott orally at a conference without proceedings, and then in this unpublished General Electric report:

• Kouvel, J.S. (September 1957). Methods for Determining the Curie Temperature of a Ferromagnet (Report). General Electric Research Laboratory Report No. 57-RL-1799.

On the other hand, the author of this report, Kouvel, said in a journal article ( doi: 10.1103/PhysRev.136.A1626) that it was "first proposed by Belov and Goryaga, and later independently by one of us [cites the GE report above]".

• Belov, K. P.; Goryaga, A. N. (1956). "[Unknown title]". Fizika metallov i metallovedenie. 2 (1): 3.

I haven't been able to track down either citation; the early history is a bit murky. 〈  Forbes₇₂ |  Talk 〉 00:39, 10 July 2022 (UTC) reply