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Do you know if both NFC and a magnet would work correctly in this scenario?

I´m designing small pieces of concrete (imagine chess pieces) with three layers: magnet inside, NFC tag in the middle, and felt on the surface.

I would like a smartphone to be able to read the NFC and for the magnet to be used to attach it to a piece of metal.

enter image description here

Another option (taking into account the conductivity of the magnet) is to move the magnets to the sides:

enter image description here

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  • \$\begingroup\$ I think, that the NFC works with magnetic field, so the permanent magnet will affect it. \$\endgroup\$
    – Steporkak
    Commented Jan 2, 2022 at 17:23
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    \$\begingroup\$ I have read a lot about the subject and it seems that a stable magnetic field of the permanent magnet would not affect the NFC, since it works with a dynamic electromagnetic field. But of course, I'm not an expert on the subject ... :( \$\endgroup\$
    – Kaixo
    Commented Jan 2, 2022 at 17:30
  • \$\begingroup\$ I just checked the conductiveness of the piece and is not conductive. \$\endgroup\$
    – Kaixo
    Commented Jan 2, 2022 at 18:09
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    \$\begingroup\$ The magnet (being likely a conductor) will sap up eddy currents big time and this means that NFC may not work at all well. \$\endgroup\$
    – Andy aka
    Commented Jan 2, 2022 at 18:09
  • \$\begingroup\$ So I suppose that if I put a electrically nonconductive barrier between the metal and the NFC tag, maybe it will work. I know that there are some special tags just to put them in metallic areas. \$\endgroup\$
    – Kaixo
    Commented Jan 2, 2022 at 18:19

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NFC does not work well near metal, space the tag as far away away from the metal as possible. especially do not place the tag between the metal and a metal magnet.

consider using bullet shaped tags in wells or embedding the tag more deeply when the concrete is cast.

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