Can magnets interfere with electronics?
Can magnets interfere with electronics?
Yes, magnets can interfere with electronics, but not under all conditions and not for every type of device. The most vulnerable are components that use magnetic recording principles and sensitive sensors and measurement systems. However, modern digital circuits such as flash memories and processors are immune to static magnetic fields.
Magnetic field effects on digital electronics
Modern electronic devices such as smartphones, tablets, laptops and Pendrives use flash memory, based on the storage of electrical charge in semiconductor cells. They have nothing to do with magnetic storage, so a magnetic field - even a very strong one - under normal operating conditions is unable to erase or disrupt the data on such a chip. This dispels the popular myth that simply applying a magnet to a phone will damage it. In fact most electronics manufacturers themselves use neodymium magnets** in components such as Speakers, vibration motors and wireless charging systems (e.g. MagSafe).
Sensitive devices - magnetic recording and sensors
Magnets are sensitive to older devices based on magnetic recording technology. Examples are traditional hard disk drives (HDD), cassette tapes, VHS tapes or magnetic strips on bank cards. A strong field can disrupt the ordering of the magnetic domains in the recording layer and lead to permanent data loss. Equally important are electronic sensors based on the Hall effect, used in positioning systems, digital compasses and also in some smartphones and watches. External magnetic fields can interfere with their readings, causing erroneous readings. However, usually these effects are reversible and disappear when the magnet is removed, and the system can be recalibrated.
Electromagnetic interference vs. static field
It is important to distinguish static magnetic field, i.e. that produced by an ordinary permanent magnet, from electromagnetic interference (EMI), which arises from changes in the field over time. The latter can induce currents in electronic circuits and cause malfunctions, but an ordinary permanent magnet does not generate an alternating field, and therefore does not cause typical EMI interference. The situation is different with solenoids or strong pulse coils - these can have a real impact on Integrated circuits, especially with inadequate shielding and grounding.
Risks for medical systems
Particular caution should be exercised for those with implanted medical devices such as pacemakers or defibrillators. Strong magnetic fields, even static ones, can interfere with the operation of these devices, causing malfunctions or complete stoppage of function. Therefore *neodymium magnets should be kept away from people with medical implants**, as recommended by medical equipment manufacturers.
Transfer Multisort Elektronik (TME) is one of the world’s largest global distributors of electronic components, electrotechnical parts, workshop equipment, and industrial automation. The catalog includes over 1,500,000 products from 1,300 leading manufacturers. TME’s modern logistics centers in Łódź and Rzgów (Poland), with a combined area of over 40,000 m², ship nearly 6,000 packages daily to customers in more than 150 countries.
TME also invests in the development of knowledge and skills of young engineers and electronics enthusiasts through the TME Education project, and supports the tech community by organizing the TechMasterEvent series, promoting innovation and experience exchange.
