Hall Effect – Reed Switch – TMR

Custom and stock magnets for all sensor applications.

Sensors are one of the most common uses for a wide variety of permanent magnets. You will find sensors in thousands of different applications in many industries – automotive, medical, electronics, aerospace, defense, manufacturing, etc. Magnetic sensors can identify and help measure proximity, position, velocity, direction of movement and much more.

Permanent magnets used in sensor applications can be made from traditional materials like alnico, ferrite and neodymium, and many newer sensor designs are utilizing injection molded magnet technology due to its unique properties and ready availability (domestic materials, fewer supply chain issues).

Hall effect sensors are sued to measure velocity, position, proximity, electrical current, etc. They utilize a magnetic field, interacting with the sensor to induce a voltage that can then be measured. These sensors are very durable, and are not easily effected by exposure to water and other contaminates that can be present in more challenging environments.

Hall effect sensors are often paired with multi-pole magnets to optimize their capabilities. EAM can work with you to design a magnet for your sensor application, including custom magnetizing fixtures if necessary.

Hall effect sensor applications include:


Motion sensing and control

Industrial controllers


Fuel injection

Reed switches are very common, reliable magnetic switches that have been used across many industries since the 1940’s. They use a pair of thin blades that either open or close an electrical circuit when they come into proximity with a magnetic field. Products like alarm systems often use reed switches to trigger the alarm when the magnet on a door or window is moved away from the magnetic field. EAM has extensive experience designing magnets for reed switch applications.

TMR Sensors are a newer type of sensor that utilize the TMR (tunnel magneto-resistance) effect. This phenomenon, discovered by researchers at Tohuko University in Japan in 1995, shows that resistance changes along with variations in a magnetic field.  TMR sensors use an extremely thin insulation layer which is sandwiched between two ferro-magnetic layers. Electrons flow between the layers (a quantum mechanical effect), and the resistance can be altered by changing the direction of the magnetic field.

This allows for the production of very low voltage, highly accurate sensors. They are less susceptible to temperature changes and exhibit a high degree of magnetic sensitivity.  EAM can help with the selection of magnet materials and configurations designed to work specifically with TMR sensor applications

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Why Choose EAM?

Fast prototyping

Experienced team of magnet specialists

High volume capacity

Quality – IATF 16949 certified

Domestic and offshore supply chain options

Local stock, JIT delivery available