Four Classes of Modern Commercialized Magnets

Magnets are an important part of our daily lives, serving as essential components in everything from electric motors, loudspeakers, computers, compact disc players, microwave ovens and the family car, to instrumentation, production equipment, and research. Their contribution is often overlooked because they are built into devices and are usually out of sight.

Magnets function as transducers, transforming energy from one form to another, without any permanent loss of their own energy. General categories of permanent magnet functions are:

Mechanical to mechanical – such as attraction and repulsion

Mechanical to electrical – such as generators and microphones.

Electrical to mechanical – such as motors, loudspeakers, charged particle deflection

Mechanical to heat – such as eddy current and torque devices

Special effects – such as magnetoresistance, Hall effect sensors, and magnetic resonance

The following sections will provide a brief insight into the design and application of permanent magnets. There are four classes of modern commercialized magnets, each based on their material composition. Within each class is a family of grades with their own magnetic properties. These general classes are:

Neodymium Iron Boron alnico magnets
Samarium Cobalt
Ceramic (ferrite)
Alnico

NdFeB and SmCo are collectively known as Rare Earth magnets because they are both composed of materials from the Rare Earth group of elements. Neodymium Iron Boron (general composition Nd2Fe14B, often abbreviated to NdFeB) is the most recent commercial addition to the family of modern magnet materials.

At room temperatures, NdFeB magnets exhibit the highest properties of all magnet materials.

Four Classes of Modern Commercialized Magnets

Four Classes of Modern Commercialized Magnets

Samarium Cobalt is manufactured in two compositions: Sm1Co5 and Sm2Co17 – often referred to as the SmCo 1:5 or SmCo 2:17 types. Samarium 2:17 has higher Hci values, offer greater inherent stability than the 1:5 types.

Ceramic, also known as Ferrite, magnets (general composition BaFe2O3 or SrFe2O3) have been commercialized since the 1950s and continue to be extensively used today due to their low cost. A special form of flexible ceramic magnetic material can be made by bonding ceramic powder in a flexible binder.

Alnico magnets (general composition Al-Ni-Co) were commercialized in the 1930s and are still extensively used today.

Custom Made Magnet Neo Circular Ring N38UH OD 83mm

Custom Made Magnet Neo Circular Ring N38UH OD 83mm, Customized Axially Anisotropic Circular Powerful NdFeB Multi-pole Ring Permanent Magnets for Speaker, Multimedia, Sound Device, Regular Neodymium Ring Large Motor Magnets, Sintered REE Permanent Magnet, Industrial Magnet China Supplier Custom Made Magnet Neo Circular Ring N38UH OD 83mm Feature: Magnet Material: NdFeB or Neodymium Iron Boron […]

High Performance Strong Rare Earth Ring Magnet N42SH Diameter 60mm

High Performance Strong Rare Earth Ring Magnet N42SH Diameter 60mm, Custom Axially Anisotropic Circular Powerful NdFeB Multi-pole Ring Permanent Magnets for Speaker, Multimedia, Sound Device, Regular Neodymium Ring Large Motor Magnets, Sintered REE Permanent Magnet, Industrial Magnet China Supplier High Performance Strong Rare Earth Ring Magnet N42SH Diameter 60mm Feature: Magnet Material: NdFeB or Neodymium […]

Custom Multi-poles Axially Neodymium Ring Magnet N33UH

Custom Multi-poles Axially Neodymium Ring Magnet N33UH, Anisotropic Circular Powerful NdFeB Multi-pole Ring Permanent Magnets for Speaker, Multimedia, Sound Device, Regular Neodymium Ring Large Motor Magnets, Sintered REE Permanent Magnet, Industrial Magnet China Supplier Custom Multi-poles Axially Neodymium Ring Magnet N33UH Feature: Magnet Material: NdFeB or Neodymium Iron Boron Magnet shape: Ring Magnet grade: N33UH […]