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TechTalk Category: Tech Briefs

Magnetic Permeability:  Why Are Some Materials Attracted By A Magnet And Others Are Not?

Two magnets attract to each other because their fields interact.  Usually materials that are not magnets do not have a net external field, and obviously, they do not attract to things; however, some metal alloys can have a net field created by applying an external field.  This induced field is only present when the external […]

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Why Magnets Lose Strength: The Effects of Volume Loss, Geometry, Elevated Temperature, and Demagnetization from External Fields

In the absence of external influences, a commercially viable magnet alloy should remain magnetic for hundreds of years.  The alloy’s resulting field may degrade slightly from aging effects, but for the most part it should remain an effective magnetic field source.  With that said, most magnets used in real world applications experience many external demagnetizing […]

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Machined Magnets

The use of as-cast or near net shape magnets is almost always a preferred design path, but this is not always feasible.  This is where machining comes into play.  Some of the machining techniques common in the metalworking arena are modified and adapted to create special design features or to achieve specified tolerances on magnets.  […]

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What is Maximum Energy Product / BHmax and How Does It Correspond to Magnet Grade?

The term Maximum Energy Product (BHmax) is a commonly used, but often misunderstood figure of merit of magnets.  The BHmax is an Energy Density and it is oftentimes used to denote grade.  The grade convention is especially used for Rare Earth magnets, (Neodymium Iron Boron Magnets and Samarium Cobalt Magnets).  For instance, a grade 48 […]

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Magnet Materials Comparison Guide

A customer’s recent four magnet sample request (similar shape/size in Neodymium, Samarium Cobalt, Alnico, and Ceramic Ferrite) illustrates some of the challenges associated with selecting the proper magnet material. Instead of simply fulfilling this request, we took the time to discuss project specifics and learned our customer was interested in reducing the cost and maintaining […]

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Explaining Various Grades of Neodymium

If you are confused by the available grades of Neodymium or curious about how a grade is assigned to a particular Neodymium alloy, this post is for you.  

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Did You Know?

Licenses are required to produce and sell Neodymium. Make sure your source is supplying you with your license.

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