A portable instrument for non-contact giant magnetoresistance measurements utilizing the magnetorefractive effect and infrared fibres

被引：5

作者：

Stanton, Tomas ^{[1
]}

Vopsaroiu, Marian ^{[1
]}

Thompson, Sarah M. ^{[1
]}

机构：

[1] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England

来源：

MEASUREMENT SCIENCE AND TECHNOLOGY | 2008年 / 19卷 / 12期

基金：

英国工程与自然科学研究理事会;

关键词：

giant magnetoresistance; GMR; magnetorefractive effect; MRE; infrared;

D O I：

10.1088/0957-0233/19/12/125701

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A portable, low-cost instrument is presented capable of non-contact giant magnetoresistance (GMR) measurements through correlation with the magnetorefractive effect. Each component has been optimized for signal-to-noise ratio, portability and economy. The final design incorporates a pulsable thin-film infrared emitter which floods the surface of the sample providing reflected radiation focused by a lens into an infrared transmitting fibre. This shields the signal and transports it to a lithium tantalate pyroelectric detector. The measurements are performed at 5 Hz, allowing phase sensitive discrimination to reduce noise levels. The instrument is tested on a CoFe/Cu GMR multilayer and its response demonstrated to compare very favourably with larger more expensive instruments providing new opportunities for the remote sensing of GMR.

引用

页数：7

共 12 条

[11] A new experimental design for noncontact giant magnetoresistance measurements using the magnetorefractive effect
Vopsaroiu, M
Matthew, JAD
Thompson, SM
[J]. REVIEW OF SCIENTIFIC INSTRUMENTS, 2004, 75 (10) : 3127 - 3130
[12] Noncontact GMR measurements of synthetic spin valves using IR reflection spectroscopy
Vopsaroiu, M
Matthew, JAD
McNeill, KA
Thompson, SM
[J]. IEEE TRANSACTIONS ON MAGNETICS, 2003, 39 (05) : 2830 - 2832

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