Picotesla Magnetic Sensors for Low-Frequency Applications

被引：49

作者：

Liou, S. H. ^{[1
,2
]}

Yin, Xiaolu ^{[1
,2
]}

Russek, Stephen E. ^{[3
]}

Heindl, Ranko ^{[3
]}

Da Silva, F. C. S. ^{[3
]}

Moreland, John ^{[3
]}

Pappas, David P. ^{[3
]}

Yuan, L. ^{[4
]}

Shen, J. ^{[4
]}

机构：

[1] Univ Nebraska, Dept Phys & Astron, Lincoln, NE 68588 USA

[2] Univ Nebraska, Ctr Mat & Nanosci, Lincoln, NE 68588 USA

[3] Natl Inst Stand & Technol, Boulder, CO 80305 USA

[4] Western Digital Corp, Fremont, CA 94539 USA

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2011年 / 47卷 / 10期

基金：

美国国家科学基金会;

关键词：

Magnetic concentrators; magnetic noise; magnetic sensor; magnetic tunnel junction (MTJ); FIELD; DESIGN; NOISE;

D O I：

10.1109/TMAG.2011.2157997

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We demonstrate a simple low-power, magnetic sensor system suitable for high-sensitivity magnetic-field mapping, based on solid-state magnetic tunnel junction devices with minimum detectable fields in a 100 pT range at room temperature. In this paper, we discuss a method that uses multilayer thin films to improve the performance of the soft ferromagnetic layer in magnetoresistive sensor applications, by reducing the coercivity and/or improving the reversibility. We have used it in the design of our new magnetic sensor. This sensor has a sensitivity as high as 750%/mT. The magnetic sensor only dissipates 1 mW of power while operating under an applied voltage of 1 V.

引用

页码：3740 / 3743

页数：4

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