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AAT001-10E TMR Sensor
An external magnet provides a saturating magnetic field (30 to 200 Oe) in the plane of the sensor, as
illustrated below for a bar magnet and a split-pole magnet:
The sensor element free layers will align with the external field. As the applied field changes direction, the
angle between the free layer and the pinned layer changes, changing the resistance of TMR elements, which
changes the device output voltages.
Variations in the air gap between the magnet and the sensor element will cause slight changes in the output
depending on the size and strength of the external magnet. The following chart shows a typical sensor output
versus the angle of applied field using a 12 mm diameter, 4 mm thick split-pole ferrite magnet and a 5 V
supply with three different air gaps:
Angle Sensor Output with Variations in Airgap, 5V Supply
2.9
Cosine, 3mm
2.8
2.7
2.6
Sine, 3mm
Cosine, 4mm
Sine, 4mm
Cosine, 5mm
Sine, 5mm
2.5
2.4
2.3
2.2
2.1
2
0
24
48 72 96 120 144 168 192 216 240 264 288 312 336 360
Degrees of Rotation
NVE Corporation
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11409 Valley View Road, Eden Prairie, MN 55344-3617
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(952) 829-9217
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www.nve.com
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