Abstract
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.
Original language | English |
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Article number | 125701 |
Pages (from-to) | - |
Number of pages | 7 |
Journal | Measurement Science and Technology |
Volume | 19 |
Issue number | 12 |
DOIs | |
Publication status | Published - Dec 2008 |
Keywords
- giant magnetoresistance
- GMR
- magnetorefractive effect
- MRE
- infrared
- CONTACTLESS MEASUREMENT
- REFLECTION