Featured Research

from universities, journals, and other organizations

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.

Related Articles


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 December 19, 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 December 19, 2014).

Share This


More From ScienceDaily



More Matter & Energy News

Friday, December 19, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Building Google Into Cars

Building Google Into Cars

Reuters - Business Video Online (Dec. 19, 2014) Google's next Android version could become the standard that'll power your vehicle's entertainment and navigation features, Reuters has learned. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
AP Review: Nikon D750 and GoPro Hero 4

AP Review: Nikon D750 and GoPro Hero 4

AP (Dec. 19, 2014) What to buy an experienced photographer or video shooter? There is some strong gear on the market from Nikon and GoPro. The AP's Ron Harris takes a closer look. (Dec. 19) Video provided by AP
Powered by NewsLook.com
Navy Unveils Robot Fish

Navy Unveils Robot Fish

Reuters - Light News Video Online (Dec. 18, 2014) The U.S. Navy unveils an underwater device that mimics the movement of a fish. Tara Cleary reports. Video provided by Reuters
Powered by NewsLook.com
3D Printed Cookies Just in Time for Christmas

3D Printed Cookies Just in Time for Christmas

Reuters - Innovations Video Online (Dec. 18, 2014) A tech company in Spain have combined technology with cuisine to develop the 'Foodini', a 3D printer designed to print the perfect cookie for Santa. Ben Gruber reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins