Accession Number:

ADA495594

Title:

Magnetic Sensors with Picotesla Magnetic Field Sensitivity at Room Temperature

Descriptive Note:

Final rept.

Corporate Author:

NEBRASKA UNIV LINCOLN DEPT OF PHYSICS AND ASTRONOMY

Personal Author(s):

Report Date:

2008-06-01

Pagination or Media Count:

17.0

Abstract:

High sensitivity magnetic sensors will have a significant impact on security, industry, and quality of life. Many of these applications require sensitivities better than 1 nTHz12 as well as low cost, small size, low maintenance, and low power consumption. This project is to develop highly sensitive magnetic sensors that fit the goal of the MMSON-07-03 Statement of Need. This need is to develop novel sensors applicable to the diverse detection and discrimination problems of munitions and explosives of concern MEC contaminated sites. We present a design of a low power, compact, magnetoresistive sensor. The key features of the design are 1 decreasing the noise by the use of a 64 element bridge, 2 reducing the magnetic noise by annealing of MTJ in high magnetic field and a hydrogen environment, and 3 increasing signal by the use of external low-noise magnetic flux concentrators. The field noise of our prototype magnetic sensor are approximately 1 pTHz12 at 1 kHz, 5 pTHz12 at 10 Hz, and 50 pTHz12 at 1 Hz at room temperature. The magnetic sensor only dissipates 15 mW of power while operating.

Subject Categories:

  • Magnetic and Electric Field Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE