A PHEB magnetometer with record thick multiexchange-biased sensor layer
(English)Manuscript (preprint) (Other academic)
In this paper, we develop material stacks for the fabrication of a magnetometer with multiple exchange-biased layers reaching thicknesses exceeding previous attempts in the literature. The benets of such thick sensor layers is demonstrated in terms of the low noise based on the decreasing resistance without an eect on device sensitivity. The thick sensor layers of [IrMn(15nm)/NiFe(150nm)]7/IrMn(15nm), as a novel multiple-biasing scheme, is able to stabilize up to fourteenfold biased interfaces. We measured the sensitivity and noise of these devices and report a eld detectivity of 600 pT/pHz at 2 Hz. Our results describe a reliable technique for the fabrication of thick prototype magnetometers based on the exchange-bias mechanism.
AMR, Magnetic sensor, Ferromagnetic, Antiferromagnetic, NiFe, IrMn, exchange bias
Condensed Matter Physics
Research subject Materials Science and Engineering; Physics
IdentifiersURN: urn:nbn:se:kth:diva-187235OAI: oai:DiVA.org:kth-187235DiVA: diva2:929319
QC 201605192016-05-182016-05-182016-05-19Bibliographically approved