FAQUsageCharacteristicsMagnetsActuationModificationsProtectionTestingLevel SensingLifeGlossary

Magnet Information

In general, there are four families of magnets available commercially. Factors such as operating temperature, demagnetizing effects, field strength, environmental characteristics, and available space for movement etc. need to be considered before selecting a magnet for a reed switch or reed sensor application. An overview of each of the families of magnets is given below. A list of our standard magnets is available here.

NdFeB

Highest energy product

Very high remanance and coercivity

Relatively low priced

Mechanically stronger than SmCo

Some grades can be used up to 200°C

Not recommended in Hydrogen atmosphere

Bonded types can be machined but not tapped

SmCo

High energy product

Suitable for high performance applications

High resistance to demagnetization

Excellent thermal stability

High corrosion resistance

Most expensive magnet

Can be used up to 300°C

Prone to chipping - should not be used as a structure

AlNiCo

Cheaper than rare earth magnets

Highest working temperature of 550°C

Lowest temperature coefficient

Low coercivity when compared to other types

High induction levels

Ferrites

Brittle

Poor thermal stability

Cheapest of all types

Can be used up to 300°C

Needs grinding to meet tight tolerances

High corrosion resistance

Magnet Selection Guide

Units Conversion Table

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FAQUsageCharacteristicsMagnetsActuationModificationsProtectionTestingLevel SensingLifeGlossary