A Guide To Rare Earth Magnets

Rare earth magnets have a wide range of applications in modern industry, ranging from cars to appliances and medical devices. Although these magnets are found in everyday applications, most people do not know much about them. Below is an exhaustive guide to rare earth magnets. 

Types And Applications Of Rare Earth Magnets

There are two categories of rare earth magnets: neodymium and samarium. Neodymium magnets comprise an alloy of neodymium, boron and iron. These are the strongest earth magnets you can find. Typically, they have high energy and are resistant to demagnetisation. Their drawbacks are that they have low mechanical strength and tend to be brittle. Besides, these magnets will easily rust and are unstable at high temperatures. For this reason, manufacturers often include nickel plating to protect the magnets from corrosion. 

Neodymium magnets record data in hard disks by magnetising and demagnetising a ferromagnetic material. They are also used to hold dentures and other corrective devices in place. You will also find these magnets in lifting machinery used in the construction and industrial sectors. 

Samarium magnets comprise samarium, iron and boron alloy. Although weaker than their neodymium counterparts, they have positive attributes such as high corrosion resistance, stability under intense pressures and resistance to demagnetisation. These magnets also tend to be cheaper than neodymium magnets. 

Samarium magnets have similar applications to neodymium magnets. However, they are an ideal choice when working in high temperatures and environments where corrosion is a concern. For instance, they are used in turbos, miniature car motors, particle accelerators, gyroscopes and medical instruments such as MRIs. 

Buying Rare Earth Magnets

The truth is, your needs should be the primary determinant when deciding which magnet you should purchase. Typically, your first concern should be the magnet's grade. A high grade means that the magnet is more powerful. The magnet's application will determine whether or not it requires a coating. For instance, a neodymium magnet used to hold dental devices should have a rust-resistant coating. You should also assess the operating temperatures of the magnet.

Ideally, you should purchase the magnet from a company with many options. Besides, these companies will customise the magnet to your preferred shape. In most cases, they will also give a product warranty. 

Neodymium and samarium earth magnets are some of the strongest magnets you can find today. When buying these magnets, assess your needs and purchase the magnet from a local seller.