Principles of Magnetoresistive Elements
Magnetic Sensor Elements
Principal Characteristics of Magnetic Sensor Elements
Murata magnetic sensors use magnetoresistive elements made of n-InSb (compound semiconductor of the III-V group).
| Element |
Characteristics |
| Semiconductor magnetoresistive element (InSb) |
- Wide dynamic range (detectable from static sate to MHz order)
- Wide gap characteristic
- High output
- Output will not be saturated even at high magnetic flux density.
- Excellent environmental resistance
- Temperature characteristics are provided.
- Output sin wave distortion factor is low.
 High multiplication output is enabled.
- Polarity differentiation is disabled.
|
| Hall element |
- Wide dynamic range
- Low output Used for Hall ICs
- Polarity differentiation is enabled.
- Magnetic flux density/output characteristic is linear.
|
| Ferromagnetic thin film element |
- Product sensitivity is high. Suitable for detection of feeble magnetic fields.
- Magnetic flux horizontal to element surface is detected.
- Temperature characteristics are relatively excellent.
- Output will be saturated depending on magnetic flux density.
- Hysteresis is provided for magnetic flux density.
- Gap characteristic is poor.
|
| Coil pickup |
- High output
- High resolution
- Temperature characteristics are excellent.
- Output depends on speed. Detection of 20-Hz or lower frequency is difficult.
- It must be used in contact with the target material, because of its poor gap characteristic.
|
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Operating Ranges and Application Fields of Magnetic Sensors
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Principles of Magnetoresistive Elements
