Measurement system for temperature dependent noise characterization of magnetoresistive sensors

Abstract

Magnetoresistive (MR) sensors and sensor systems are used in a large variety of applications in the field of industrial automation, automotive business, aeronautic industries, and instrumentation. Different MR sensor technologies like anisotropic magnetoresistive, giant magnetoresistive, and tunnel magnetoresistive sensors show strongly varying properties in terms of magnetoresistive effect, response to magnetic fields, achievable element miniaturization, manufacturing effort, and signal-to-noise ratio. Very few data have been reported so far on the comparison of noise performance for different sensor models and technologies, especially including the temperature dependence of their characteristics. In this paper, a stand-alone measurement setup is presented that allows a comprehensive characterization of MR sensors including sensitivity and noise over a wide range of temperatures.

Operational Parameters for Sub-Nano Tesla Field Resolution of PHMR Sensors in Harsh Environments

“…No hysteresis was observed up to 70 °C, and only at 90 °C the full field range sweeping shows a negligible hysteresis. Importantly, in our earlier reports [ 21 , 38 ], no signature of signal hysteresis was observed even in the higher temperature for single ring-PHMR and cross-PHMR sensors, which might be due to the decrease in exchange coupling at higher temperatures ≥90 °C [ 64 ]. Furthermore, similar characterizations were performed in CV mode for all sensors, and no unusual behavior was observed in sensor response (see Figure A1 in Appendix A ).…”

“…It can be envisaged that noise measurement under different operational conditions, such as various temperatures and/or sensing currents, might add some salient features in the sensor characterization. Moreover, it can be helpful for understanding the origins and manifestations of various noise sources, which may lead to improvement in sensor robustness and the development of novel applications [ 38 ]. Recently, we decomposed noise source components of different planar-Hall magnetoresistive (PHMR) sensors in order to address their high thermal stability and low temperature drift characteristics [ 17 ].…”

An Improved Vehicle Detection Algorithm Based on Multi-Intermediate State Machine

“…Besides, the Wheatstone bridge converts the changes of the magnetic field to output in the form of differential voltages. e resistivity ρ of the nickel-iron magnetic alloy material depends on the angle θ between the magnetic field strength M and the current I. e functional relationship is as follows [10]:…”

Traceably calibrated scanning Hall probe microscopy at room temperature

“…The graphene samples were grown on silicon carbide (SiC) (0001) substrates with a size of 5 mm × 10 mm using a so-called polymer-assisted sublimation growth technique (Kruskopf et al, 2016;Momeni Pakdehi et al, 2018, 2019. The high morphological and electronic homogeneity of the graphene samples utilizes scalable realization of Hall sensors on true two-dimensional carbon sheets without bilayer inclusions.…”

“…The background noise of the system is 3 nV Hz − 1 2 . More details about the noise measurement system can be found in Nording et al (2017) and Nording (2019). The property data are summarized in Table 1.…”