What Makes Magnets Fail?
Magnets can fail due to various factors that disrupt their internal structure. To understand how magnets fail, we must first know how they work in the first place.
In the magnetic material, atoms with the same magnetic field direction clump together in groups called domains. Each domain has a north and south pole and acts like its own little bar magnet. When the domains are oriented in different directions the magnetic fields cancel each other out. But when the domains are aligned in the same direction, their strength is combined, and a strong magnetic field is created. For a closer look at how domains work check out our tutorial on magnetism
The domains can get out of alignment and kill the magnetic field. Here are the most common causes of magnet failures:
When magnets are subjected to elevated temperatures, the thermal energy can cause the magnetic domains within the material to vibrate more vigorously. This increased motion can disrupt the alignment of the domains, reducing the overall magnetic field strength and potentially leading to complete demagnetization.
Strong magnetic fields in the opposite direction can overpower the magnet’s internal field, causing the magnetic domains to realign or randomize. This realignment weakens the magnet’s overall magnetic properties and can lead to a loss of magnetism.
The physical force from severe impact or sudden stress can even cause the alignment of the magnetic domains to be disrupted or destroyed.
Certain types of magnets, such as neodymium magnets, are susceptible to corrosion and oxidation. Exposure to moisture, humidity, or corrosive substances can lead to the degradation of the magnet material. Corrosion can weaken the magnetic field and cause the magnet to lose its magnetic properties over time.
Magnets can undergo a gradual loss of magnetism known as magnetic aging. This occurs due to a combination of factors such as temperature variations, exposure to external magnetic fields, and the properties of the magnet material. Over time, these factors can cause the magnetic domains to slowly reorient, resulting in a reduction of the magnet’s overall magnetic strength.
To prevent magnet failure, it is important to handle magnets with care, avoid subjecting them to extreme temperatures, protect them from moisture and corrosive environments, and minimize exposure to strong external magnetic fields. By following proper care and handling practices, magnets can maintain their magnetic properties and have a longer operational lifespan.
