Temperature Dependence of Noise in Giant- and Tunneling Magnetoresistive Vortex Sensors

Author(s)
Herbert Weitensfelder, Hubert Brueckl, Armin Satz, Dieter Suess
Abstract

Giant magnetoresistive (GMR) and tunneling magnetoresistive (TMR) spin valve sensors with a vortex-state free layer have been studied using resistance and noise measurements for temperatures from 50 to 400 K. A vortex-state free layer enables high saturation fields of the sensor while strongly reducing the phase noise and enabling a theoretically hysteresis-free transfer curve. The results show that the noise in both sensor types peaks at a temperature of about 200 K. Measurements in a saturated state enable a separation of electric and magnetic noise contributions and show that in contrast to TMR, both electric and magnetic noise contributions decrease with temperature for the GMR sample.

Organisation(s)
Physics of Functional Materials
External organisation(s)
Donau-Universität Krems, Infineon Technologies Austria AG
Journal
IEEE Transactions on Magnetics
Volume
55
No. of pages
5
ISSN
0018-9464
DOI
https://doi.org/10.1109/TMAG.2019.2893650
Publication date
07-2019
Peer reviewed
Yes
Austrian Fields of Science 2012
Magnetism, Materials physics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/temperature-dependence-of-noise-in-giant-and-tunneling-magnetoresistive-vortex-sensors(acc3db63-2ac4-48cc-a2a1-91ba6a15e940).html