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

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 reduc...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on magnetics 2019-07, Vol.55 (7), p.1-5
Main Authors: Weitensfelder, Herbert, Brueckl, Hubert, Satz, Armin, Suess, Dieter
Format: Article
Language:English
Subjects:
Electrical resistance measurement
Frequency measurement
Giant magnetoresistance
Giant magnetoresistive (GMR)
Magnetic sensors
Magnetism
Magnetoresistivity
Noise
Noise measurement
Noise reduction
Sensors
Spin valves
Temperature
Temperature dependence
Temperature measurement
Temperature sensors
tunneling magnetoresistive (TMR)
Vortices
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2019.2893650