Noise Characterization of Vortex-State GMR Sensors with Different Free Layer Thicknesses

Proceedings

Suess, Dieter¹  Brueckl, Hubert²  Satz, Armin³  Weitensfelder, Herbert⁴ 

[1] Author to whom correspondence should be addressed.;Department for Integrated Sensor Systems, Danube University Krems, 2700 Wiener Neustadt, Austria;Infineon Technologies Austria AG, 9500 Villach, Austria;Physics of Functional Materials, University of Vienna, 1090 Vienna, Austria

关键词: giant magnetoresistance;    GMR;    noise;    vortex state;   

DOI  :  10.3390/proceedings2131013

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

The spin valve principle is the most prominent sensor design among giant- (GMR) and tunneling (TMR) magnetoresistive sensors. A new sensor concept with a disk shaped free layer enables the formation of a flux-closed vortex magnetization state if a certain relation of thickness to diameter is given. The low frequency noise of current-in-plane GMR sensing elements with different free layer thicknesses at different external field strengths has been measured. The measurements of the 1/f noise in external fields enabled a separation of magnetic and electric noise contributions. It has been shown that while the sensitivity is increasing with a decreasing element thickness, the pink noise contribution is increasing too. Still the detection limit at low frequencies is better in thinner free layer elements due to the higher sensitivity.

【 授权许可】

CC BY