Advances in magnetometry

A. S. Edelstein, J. Burnette, G. A. Fischer, S. F. Cheng, W. F. Egelhoff, P. W.T. Pong, E. R. Nowak

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Innovations may lead to magnetic sensors with superior performance. Examples of this are the chip scale atomic magnetometer, magnetic tunnel junctions with MgO barriers, and a device for minimizing the effect of 1/f noise, the MEMS flux concentrator. In the chip scale atomic magnetometer, researchers have been able to fabricate the light source, optics, heater, optical cell, and photodiode detector in a stack that passes through a silicon wafer. Theoretical and subsequent experimental work has led to the observation of magnetoresistance values of 400% at room temperature in magnetic tunnel junctions with MgO barriers. The MEMS flux concentrator has the potential to increase the sensitivity of magnetic sensors at low frequencies by more than an order of magnitude. The MEMS flux concentrator does this by shifting the operating frequency to higher frequencies where the 1/f noise is much smaller. The shift occurs because the motion of flux concentrators on MEMS flaps modulates the field at kHz frequencies at the position of the sensor.

Original languageEnglish (US)
Title of host publicationUnattended Ground, Sea, and Air Sensor Technologies and Applications X
StatePublished - 2008
Externally publishedYes
EventUnattended Ground, Sea, and Air Sensor Technologies and Applications X - Orlando, FL, United States
Duration: Mar 17 2008Mar 20 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceUnattended Ground, Sea, and Air Sensor Technologies and Applications X
Country/TerritoryUnited States
CityOrlando, FL

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


  • Magnetic
  • Noise
  • Sensor


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