Biomagnetic Sensing Solutions

STJB series

Features and Benefits

  • Superior field sensitivity of 5 nanotesla
  • Active areas as small as 2 x 4 microns
  • Fully compatible with microfluidics
  • Sensor-to-sensor spacing of 20 microns (standard)
  • Custom solutions available

Guidelines in Choosing SpinTJ Products for Biomagnetic Applications

In general, biological sensing applications which use magnetic micro- or nanoparticles as markers require four components: (1) a magnetic sensor, (2) a package on which the sensor is mounted, (3) sensor electronics for powering the sensor and monitoring its response, and (4) a microfluidics circuit that allows the biological solution to flow across the sensing area.

The standard STJ-001 SpinTJ sensor (bare die) can be used for single micron-size magnetic marker detection.

For determining the concentration of smaller magnetic markers (nano to micron sizes), the low-noise magnetic field sensor STJ-201 (bare die) can be used. We can also custom-design and fabricate SpinTJ bridges, with sensing elements covering areas ranging from 1 μm2 to 100,000 μm2.

For single sub-micron or nano-scale markers, we design and fabricate custom-made sub-micron (down to 100 nm) SpinTJ sensors. Call us to discuss your application and we will provide a quote for the service.

A single SpinTJ sensor can be mounted (at an additional cost) by our technicians on a package provided by the customer. We typically recommend the use of DIP or SOIC-to-DIP IC packages.

We strongly recommend the use of the D-801 (sensor preamplification electronics board). SpinTJ sensors can be directly plugged into the D-801, which also provides better ESD/EOS protection for the sensor. The D-801 amplifies and filters the voltage across the sensor and outputs an analog voltage proportional to the magnetic field. The proprietary design of the D-801 allows power supply noise and other common-mode noise across the sensor to be attenuated by over 100 dB.

We can also design and fabricate microfluidic circuits which can be coupled to the SpinTJ sensor(s) according to customer specifications.

Contact Micro Magnetics for more information on the biological applications of our SpinTJ magnetic sensor products.

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Products: MTJ Field Sensor Products: Circuit Scan CS1000