From ancient times to nowadays, coins have been used. In ancient times, gold and silver coins were used, and now coins are being made from various metals like nickel and copper. If coins and pennies are metallic, then whether they are magnetic or not?
Do they attract magnets or not? What proportion of metals is used? Do they make up of pure metals, or any other material is also used? These all questions are interrelated, and the reason of one can explain the other questions too. If we look into history, the metals used for manufacturing pennies have been changed over time. Pennies before were not magnetic. Before the pennies were made of copper and zinc, which both were non-magnetic, the idea of steel pennies came during World War II, and they started making steel pennies.
After , the metals were changed, steel was used to prepare pennies. Seel is magnetic and as such, the pennies made after are magnetic. After , they started platting them with nickel, and now nickel-plated steel pennies are also magnetic. Related: Are 10k, 14k, 18k or White Gold Magnetic? Before , coins were made up of bronze, which is non-magnetic, so coins were also non-magnetic, but after , they decided to use steel for coin manufacturing, and now the coins made of steel are magnetic.
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Correspondence to G. Reprints and Permissions. Or because there's enough Ni to overcome the austentic Fe? But I am not expert in metallurgy, relying on googled info and I do as well remember typical CrNi steel is not ferromagnetic. Interestingly, I also found that austenitic alloys can be partly converted to ferromagnetic forms martensitic and ferritic using cold working the austentic crystal structure -- which Fe favors in the presence of Ni -- can be restored by melting and recooling.
Show 1 more comment. Active Oldest Votes. Improve this answer. For instance, Heusler compounds, like Cu-Mn-Al, are composed of non-ferromagnetic metals that, together, can be ferromagnetic. See: en. Show 4 more comments. References: E. Kaufmann, C. Starr, "Magnetic Properties of Solid Solutions.
Brandes, G. Ruslan 4 4 silver badges 20 20 bronze badges. Mathew Mahindaratne Mathew Mahindaratne Even any gas can be magnetic near absolute zero, I read. See ref.
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