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Hard electronics: Hall effect magnetic field sensors for high temperatures and harmful radiation environments

Date:
March 21, 2012
Source:
Toyohashi University of Technology
Summary:
Researchers have invented Hall effect magnetic field sensors that are operable at high temperatures and harmful radiation conditions. The sensors will find applications in space craft and nuclear power stations.

SHPM images of a bismuth substituted iron garnet thinfilms at 25–100 C under an external perpendicular magnetic field Hext of150 Oe.
Credit: Toyohashi University of Technology

Researchers at Toyohashi University of Technology have invented Hall effect magnetic field sensors that are operable at high temperatures and harmful radiation conditions. The sensors will find applications in space craft and nuclear power stations.

Toyohashi Tech researchers have fabricated Hall effect magnetic field sensors operable at least 400oC and in extreme radiation conditions using gallium nitride-based heterostructures a with two-dimensional electron gas.

Silicon and III-V compound semiconductor Hall effect magnetic field sensors are widely used in the electronics industry for monitoring rotation in equipment such as optical memory disks and for banknote authentication in vending machines. However, the use of Hall sensors for monitoring magnetic fields in outer space and nuclear power stations is more challenging because of the large fluctuations in temperature and harmful radiation in these environments.

To resolve these issues, the Toyohashi Tech researchers used AlGaN/GaN two-dimensional electron gas heterostructures to fabricate high sensitivity micro-Hall effect magnetic field sensors that are stable at high temperatures and high fluxes of proton irradiation.

Notably, the AlGaN/GaN micro-Hall sensors were stable up to at least 400oC, whereas sensors fabricated using the GaAs and InSb degraded from ~120oC.

Furthermore, the electron mobility and two dimensional electron density of the AlGaN/GaN micro-Hall sensors were only slightly affected by a 1x1013 cm-2 proton dose at 380 keV.

The researchers are actively seeking industrial partners to explot the robust properties of the 2DEG-AlGaN/GaN 2DEG Hall sensors for operation at high temperatures and in harsh radiation environments.

A potential application included imaging of ferromagnetic domains at the surface of permanent magnetics. Adarsh Sandhu has demonstrated the imaging of magnetic domains in ferromagnetic materials with a AlGaN/GaN micro-Hall sensor in a high temperature scanning Hall probe microscope (SHPM).


Story Source:

The above story is based on materials provided by Toyohashi University of Technology. Note: Materials may be edited for content and length.


Journal Reference:

  1. S. Koide, H. Takahashi, A Abderrahmane, I. Shibasaki, A.Sandhu. igh Temperature Hall sensors using AlGaN/GaN HEMT Structures. Institute of Physics Journal of Physics Conference Series, 2012; (in press)

Cite This Page:

Toyohashi University of Technology. "Hard electronics: Hall effect magnetic field sensors for high temperatures and harmful radiation environments." ScienceDaily. ScienceDaily, 21 March 2012. <www.sciencedaily.com/releases/2012/03/120321152551.htm>.
Toyohashi University of Technology. (2012, March 21). Hard electronics: Hall effect magnetic field sensors for high temperatures and harmful radiation environments. ScienceDaily. Retrieved April 24, 2014 from www.sciencedaily.com/releases/2012/03/120321152551.htm
Toyohashi University of Technology. "Hard electronics: Hall effect magnetic field sensors for high temperatures and harmful radiation environments." ScienceDaily. www.sciencedaily.com/releases/2012/03/120321152551.htm (accessed April 24, 2014).

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