![]() When one magnet comes close to another, it affects the other card’s magnetic field. If you recall some basic middle school physics, every magnet has a magnetic field created by electrons moving between the two poles. ![]() RFID interference is a common, but not the only way your access card can get demagnetized. Other Modes for Demagnetization Decorative Magnets As a workaround (besides buying more expensive cards or readers), people suggest to use aluminum foil and cover the card with that. it seems like this is happening more often with low frequency cards. There are speculations whether a smartphone can actually cause a demagnetized card. Some people have these issues especially with hotel key cards which are based on 125khz frequencies (and especially easy to hack by the way). When I scan the correct card alone, it works flawlessly. This happens even when I take all three out, put them together and try to scan a card. When I try to use them, they interfere with each other and the scanner does not read my card. When looking on Quora, people report similar things: “I have three different ID badges, all with RFID in them. The Card in Wallet Problem: RFID Interference The problem with this is that, in a wallet, when an access card inevitably comes into contact with credit cards, this may cause demagnetization or desensitization. However most people obviously put their access card into their wallet for convenience. When I asked them if they had called their security company, they said they did and the recommendation was to keep their company badge separate from other cards in their wallet. A couple of people told me recently that their company ID cards ( RFID-based) had stopped working.
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