Improving the sensitivity of asymmetric magnetoimpedance in exchange biased NiFe/IrMn multilayers

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:394

Article

da Silva, R. B.¹  Silva, E. F.²  Mori, T. J. A.¹  Della Pace, R. D.¹  Dutra, R.³  Correa, M. A.²  Bohn, F.²  Sommer, R. L.³ 

[1] Univ Fed Santa Maria, Dept Fis, BR-97105900 Santa Maria, RS, Brazil

[2] Univ Fed Rio Grande do Norte, Dept Fis Teor & Expt, BR-59078900 Natal, RN, Brazil

[3] Ctr Brasileiro Pesquisas Fis, BR-22290180 Rio De Janeiro, RJ, Brazil

关键词: Magnetization dynamics;    Magnetoimpedance effect;    Films;    Multilayers;    Exchange bias;   

DOI  :  10.1016/j.jmmm.2015.06.038

来源: Elsevier

【 摘 要 】

We investigate the asymmetric magnetoimpedance effect in exchange biased NiFe/IrMn multilayers and explore the possibility of tailoring the linear region of the curves around zero magnetic field by playing with the thickness of the ferromagnetic layers, probe current frequency, and the orientation between external magnetic field and exchange bias field direction. We quantify the sensitivity by calculating the vertical bar dZ/dH vertical bar(H)=0 in a wide range of frequencies. The highest sensitivity is observed for the thicker multilayer, reaching similar to 160 m Omega/Oe at similar to 2.0 GHz, The results place exchange biased magnetoimpedance multilayers as attractive candidates for the development of auto biased linear magnetic field sensors. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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