Below are brief descriptions of the types of magnetic materials which Adams specializes in. These descriptions are short and simplified, intended only to give a basic understanding of the materials. Our experienced staff can provide application and engineering assistance, selection suggestions, samples and other services, usually at no charge to our customers.
Soft Ferrites concentrate electromagnetic fields to transmit electrical signals and power over a wide frequency range. Ferrite cores are the primary products for inductive components, which are used, for example, in switch-mode power supplies for industrial and entertainment electronics as well as for information and communications.
Flexible magnetic material is by definition a thermoplastic product. It is the only type of magnet which can be bent and flexed without affecting its performance. It can be magnetized using several different methods to fit various applications. Its natural color is dark brown.
Ceramic ("hard ferrite") is rigid and brittle and provides good magnetic performance. It is a very economical material. Ceramic can only be cut or ground to size using diamond wheels before it is magnetized. Its natural color is black.
This aluminum-nickel-cobalt alloy is more expensive than flexible or ceramic, but is excellent for high temperature use, and is readily available in rods or bars. Close tolerances can be held by grinding to customer specifications. Alnico as cast is gray to dark brown in color, but looks bright metallic when ground.
Rare Earth Magnets: Neodymium-Iron-Boron and Samarium Cobalt
These materials are more costly by weight but deliver "incredible strength in a small package." Some oxidation and high temperature concerns exist. Rare earth materials can be cut and ground to specifications before magnetization. Their natural color is gray, but they are normally supplied with a nickel or other coating.
Magnetic assemblies are up to 32 times stronger than magnets by themselves! Our standard assemblies are made with ceramic magnets and steel housings. The key is in the fact that we magnetize the magnet and the metal together, creating a strong magnetic circuit.
Adams Magnetic Products can help to answer many of these commonly asked questions about magnets and magnetism. If you have additional questions, please contact us.
|Questions about magnets|
|[Q]||What is a magnet?|
|[A]||At its most basic level, a magnet is an object that is made of materials that create a magnetic field. Magnets have poles, at least one north pole and one south pole.|
|[Q]||What is a magnetic field?|
|[A]||A magnetic field is the region in space where a magnetic force can be detected. The magnetic field strength and direction can be measured in terms of strength and direction.|
|[Q]||What is magnetism?|
|[A]||Magnetism is the force of attraction or repulsion between substances made of certain materials, such as iron, nickel, cobalt, and steel. The force of magnetism, simply put, is due to the motion of electric charges.|
|[Q]||What can magnets do?|
Magnets have several useful functions. Based on experience with household magnets, most people know that magnets attract materials, including iron, nickel, cobalt, and steel. Many people also know that magnets attract magnets at opposite poles and repel magnets at like poles. But magnets do much more.
Magnets effect electrically charged particles and electrical conductors. Magnets have the ability transform electrical energy without losing their own energy. These effects can perform useful functions, for example:
|[Q]||What are rare earth magnets?|
|[A]||The term Rare Earth Magnets is used to refer to a group of magnetic materials whose alloys consist of one or more of the Rare Earth elements. These materials are characterized by exceptionally strong magnetic properties.|
|[Q]||What are alnico magnets?|
|[A]||Alnico magnets are aluminum-nickel-cobalt magnets. They are ideal for high-temperature use, At Adams, we stock most types of Alnico materials, and they are commonhttly supplied as long rods or bars. A long magnetic path length to pole surface ratio (usually 4:1 or greater) assists in providing good magnetic performance.|
|[Q]||What are flexible magnets?|
|[A]||Flexible magnets have multi-pole magnetization patterns for maximum holding power. They are easily cut with scissors, knives, or die cut. They are available with adhesive or colored vinyl coating.|
|[Q]||What are ceramic magnets?|
|[A]||Ceramic magnets are made from strontium and iron oxide powders. They are generally harder, more brittle and lighter than metal alloy magnets. Ceramic magnets have a high electrical resistance.|
|[Q]||What are soft ferrite cores?|
|[A]||Soft ferrite is a nonmetallic magnetic material. Soft ferrite cores are used in computers, telecommunication equipment, TVs, and a variety of industrial equipment. Adams is an authorized distributor of Soft Ferrite cores and accessories manufactured by Ferroxcube (formerly Philips), EPCOS (formerly Siemens), Magnetics Inc., Neosid, and Steward.|
|[Q]||What are magnetic assemblies?|
|[A]||Magnetic assemblies are up to 32 times stronger than regular magnets and are typically made with ceramic magnets. At Adams, we create magnetic assemblies in custom sizes, designs, and coatings.|
|[Q]||What are permanent magnets made of?|
Today's permanent magnets are made of alloys. Alloy materials include
|[Q]||How are magnets made?|
Magnets are made using the following manufacturing methods:
|[Q]||What are magnetic poles?|
|[A]||All magnets have points, or poles, where their magnetic strength is concentrated. Those points are called poles. We label them north and south because suspended magnets orient along north-south planes. On different magnets, like poles repel each other, opposite poles attract.|
|[Q]||What is the difference between the north and south poles of a magnet?|
|[A]||When suspended or allowed to rotate freely, magnets orient themselves in a north-south direction. The end of a magnet that points to the north is called the north pole. The point that seeks the south is called the south pole.|
|[Q]||Is there a simple way to tell which end of a magnet is the north pole?|
|[A]||Both poles of a magnet look the same. However, if you place a compass near a magnet, the needle that normally points toward the north pole of the earth moves in the direction of the magnet's south pole.|
|[Q]||What does 'orientation direction' mean?|
|[A]||Some magnets, called oriented or anisotropic magnets, have a preferred direction in which they should be magnetized. The "orientation direction," also known as an "easy axis" or "axis," is the direction that achieves its maximum magnetism. Other magnets, called unoriented or isotropic magnets, can be magnetized in any direction.|
|[Q]||Is it true that magnetic fields are stronger closer to the magnets themselves?|
|[A]||Yes. The strength of magnetic fields diminishes with distance. This phenomenon can be measured with exponential equations.|
|[Q]||What is the difference between permanent magnets and electromagnets?|
|[A]||Permanent magnets emit a magnetic field without the need for any external source of power. An electromagnet emits a magnetic field only when an electrical current runs through it.|
|[Q]||Are permanent magnets really permanent?|
|[A]||Magnets generally retain their magnetism unless they are stored near power lines, other magnets, and high temperatures. Over time, magnet materials lose a very small amount of magnetism. For example, Samarium Cobalt magnets may lose about 1% of their magnetism in ten years.|
|[Q]||Do magnets get weaker? How?|
|[A]||Several factors can weaken the magnetism in a magnet. If a magnet is stored close to heat, strong electrical currents, other magnets, or radiation, it can lose its strength. Additionally, high humidity can corrode neodymium magnets.|
|[Q]||Can magnets that have lost their magnetism be re-magnetized?|
|[A]||That depends on how the magnetism was lost. Usually magnets can regain their original strength unless they've been exposed to extreme heat.|
|[Q]||Can magnets be made stronger?|
|[A]||Once a magnet is fully magnetized, it cannot be made any stronger.|
|[Q]||How is magnetic strength measured?|
A number of devices measure the strength of magnets. Here are a few common devices.
|[Q]||What kind of magnets are the strongest?|
|[A]||Rare earth magnets are the strongest.|
|Questions About Adams|
|[Q]||What types of magnets does Adams Magnetic Products specialize in?|
We specialize in several types of magnets.
|[Q]||How do I contact Adams?|
|[A]||Just call 1-800-747-7543, fax 1-800-747-1323, or email email@example.com.|
|[Q]||What information should I provide when ordering?|
We will help you with your order. Usually we ask for the following information.
|[Q]||Does Adams have a catalog?|
|[A]||We have a catalog of offerings. If you would like to order a catalog, please call 1-800-747-7543, fax 1-800-747-1323, or email firstname.lastname@example.org.|
|[Q]||How long has Adams Magnetic Products been in service?|
|[A]||Adams Magnetic Products was established in 1950, delivering more than 50 years of expertise and service.|