Do Neodymium Magnets Wear Out

Do magnets lose their power over time?

Before buying a new magnet, numerous people want to know do magnets wear out. It depends on the material (magnetic domain) used in the construction of magnet. The magnetic fields have electrons, and their spins are associated with each other. 

This alignment can damage over time because of stray electromagnetic fields and heat. It can weaken the magnetism level. The procedure is slow; however, an advanced samarium-cobalt magnet takes almost 700 years to lose its half strength.  

Do neodymium magnets wear out?

Without external influences, a neodymium magnetic alloy will maintain its magnetic properties for hundreds of years. The resulting field of an alloy may degrade from aging impacts, but it must maintain an efficient magnetic field source. Neo magnets used in different world applications experience different exterior demagnetizing conditions.

A moderately demagnetized magnet can influence operational performance greatly that will result in catastrophes. Remember, a decrease in the volume of the magnet can be the reason behind performance degradation. It may result from the mechanical impact that can fracture a section of the magnet from main body.

Corrosion can increase the chances of volume loss. Typically, a performance loss from fracturing or corrosion is obvious and observable. A mechanism exists to demagnetize an intact magnet partially. For this reason, it results in degradation of performance and impacts the magnet’s life.

Strength Maintenance and Magnet Geometry

Aluminum alloy may not be magnetized because a magnetized magnet is in a high energy state. If a magnet tries to decrease the energetic state, it will become demagnetized. The neodymium magnets can maintain magnetization after removing the external magnetizing field.

Regular steel may be a strong magnet in the presence of an applied magnetizing field. The induced field of steel instantly degrades to zero after removing an external magnetizing field. In magnetic alloy, there is a mechanism that permits for constant induced mechanism. Undoubtedly, this mechanism has certain limitations.

The magnet consistently tries for self-demagnetization, and the geometry of the magnet is an essential element to influence the demagnetization. Remember, this factor can greatly impact the ability of the magnetic alloy to bear demagnetizing from different internal and external influences. In ideal magnet geometry, the resistance will be better for self-demagnetizing, external demagnetizing fields and elevated temperatures.

Decrease in Geometry of Magnet

It is possible to decrease magnet geometry to a particular ratio, such as effective pole diameter and magnetic length. The length of the magnet means the physical dimension of the magnet in the magnetization direction. The efficient pole diameter means pole region diameter or diameter of a non-circular pole.

If the length and diameter ratio is higher, the magnet can resist better in different demagnetization forms. It may result in higher cost and more volume of magnet. Remember, high length and diameter rations may result in better magnetic performance. This correlation is different than linear, and the magnet will encounter a diminishing return according to performance.

If the neodymium magnet is exposed to heat, it can lose its strength. Unfortunately, it is impossible to recover this strength. Magnets can lose their strength as they heat up.      

Author avatar
John Mathews
https://aquilaeng.com.au

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