Fractional Modeling of the AC Large-Signal Frequency Response in Magnetoresistive Current Sensors

Sensors

Sergio Iván Ravello Arias²  Diego Ramírez Muñoz²  Jaime Sánchez Moreno²  Susana Cardoso¹  Ricardo Ferreira³ 

[1] INESC Microsystems and Nanotechnologies (INESC-MN) and Institute for Nanosciences and Nanotechnologies, R. Alves Redol 9, Lisbon 1000-029, Portugal; E-Mails:;Department of Electronic Engineering, University of Valencia, Avda. de la Universitat, s/n, Burjassot 46100, Spain; E-Mails:;INL-International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga, Braga 4715-31, Portugal; E-Mail:

关键词: electrical current measurement;    magnetoresistance sensor;    fractional systems;    systems identification;   

DOI  :  10.3390/s131217516

来源: mdpi

【 摘 要 】

Fractional calculus is considered when derivatives and integrals of non-integer order are applied over a specific function. In the electrical and electronic domain, the transfer function dependence of a fractional filter not only by the filter order n, but additionally, of the fractional order α is an example of a great number of systems where its input-output behavior could be more exactly modeled by a fractional behavior. Following this aim, the present work shows the experimental ac large-signal frequency response of a family of electrical current sensors based in different spintronic conduction mechanisms. Using an ac characterization set-up the sensor transimpedance function Z_t(if) is obtained considering it as the relationship between sensor output voltage and input sensing current, . The study has been extended to various magnetoresistance sensors based in different technologies like anisotropic magnetoresistance (AMR), giant magnetoresistance (GMR), spin-valve (GMR-SV) and tunnel magnetoresistance (TMR). The resulting modeling shows two predominant behaviors, the low-pass and the inverse low-pass with fractional index different from the classical integer response. The TMR technology with internal magnetization offers the best dynamic and sensitivity properties opening the way to develop actual industrial applications.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.