NVE’s sensors are based on GMR and TMR tech

GMR and TMR: how do they work?

In the following paragraph, we would like to better explain what the GMR and TMR technologies are and how they work.

In a nutshell, GMR means “Giant Magnetoresistance” while TMR stands for “Tunneling Magnetoresistance”. These two technologies show a change in the electrical resistance based on the magnetization of adjacent ferromagnetic layers. As a result, their effects are useful for different applications with the use of magnets or more generally magnetic fields.

As you can see in the image right here, arrows pointing in the same direction mean that the resistance is minimal. On the other hand, when you see arrows in opposite directions, this refers to the fact that resistance is at its maximum. The resistance’s value determines the value of the field or measured current.

Advantages of sensors based on GMR and TMR technologies

To make a comparison with another physical principle used to manufacture different types of sensors, GMR and TMR technologies show several advantages over Hall technology (supplied by other Dimac Red’s vendors). In particular:

• higher sensitivity
• higher accuracy
• more precise operating points
• high thermal stability
• smaller size
• lower power

The 4Bs of NVE Corporation’s sensors

Let’s delve into NVE Corporation’s sensors and their particular features which can be summarized as the 4 “Bs”. So, here’s the scheme:

BOXES: miniaturization of medical and other devices
BULLET-PROOF: inherently reliable, proven in medical
BATTERIES: power as low as nanowatt
BRAINS: easy interface to the Internet of Things, I²C/SPI interfaces

A slight differences between TMR and GMR

In addition to the explanation above, TMR itself has multiple advantages. It allows a faster switching speed over GMR, excellent linearity and temperature stability, and low hysteresis.

Applications

In conclusion, NVE sensors could address several applications such as:

position sensors for linear application

• angle and rotation
• latch and switch applications
• AD- and AFL series for precise applications
• ADL-, ADT-, AHL-, AHT- series for ultraminiature and very low power
• Geartooth application
• Current measurement

After considering every technical feature, which NVE’s current sensors can be provided by Dimac Red?

In circuits ACT001 and AAV003
Over trace ALT023 and AAL024

By this point, you can learn more specifications about each device:

The ACT001-10E is a high-linearity, extremely low- hysteresis TMR current sensor. It has an on-chip current strap close to TMR sensor elements that enable highly sensitive and accurate measurements. The sensor output is a bipolar voltage signal proportional to the current through the strap.
The AAV003-10E is a high linearity, extremely low hysteresis GMR current sensor with an on-chip current strap. A GMR bridge sensor element close to the current strap senses the magnetic field created by the current. The GMR sensor element uses a unique, bipolar output, low hysteresis GMR material for excellent accuracy.
The ALT023 is a Tunneling Magnetoresistance (TMR) analog bridge sensor with an extraordinary amount of signal and a wide linear range.
The AAL024 is an NVE’s analog GMR sensors have high sensitivity, excellent temperature stability, and small size. Their versatility and wide sensing range make them an excellent choice for a variety of analog sensing applications.

Which in circuits or over trace sensors suits better your project? Contact our experts for a tailor-made proposal!