Low-noise magnetic-flux sensors based on the extraordinary magnetoresistance effect

Möller, C.H.; Kronenwerth, O.; Heyn, Ch.; Grundler, D.
April 2004
Applied Physics Letters;4/26/2004, Vol. 84 Issue 17, p3343
Academic Journal
We report noise measurements on Au–InAs hybrid structures involving a high-mobility two-dimensional electron system. Such structures show the extraordinary magnetoresistance (EMR) effect. We find excellent noise performance at room temperature close to the Johnson noise, which is in particular important for a technical application. At 4.2 K and in a magnetic field of about 1 T the nonoptimized EMR device is found to exhibit a low magnetic flux noise, offering the perspective of sensor applications also in a high magnetic field and at cryogenic temperature. © 2004 American Institute of Physics.


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