National Physical Laboratory

The integral magneto-refractive effect: a method of probing magneto-resistance.

Vopsaroiu, M, Cain, M G, Kuncer, V*
J. Appl. Phys., 2011, 110, (5), 056103
NPL Doc. Ref:
PDB: 6066 | DDB: 2595
Document Type:
Periodical article

Note: An asterisk after an author's name indicates a non-NPL author.


We show that the optical infrared magneto-refractive effect can be used to probe magneto-resistance effects in absolute terms. A spin valve sample with synthetic anti-ferromagnet has been studied using non-contact infrared reflection spectroscopy measurements. Direct experimental comparison shows excellent agreement between electrical and optical measurements in both shape of the magneto-resistance curves and absolute values. This opens the possibility of developing fast and efficient tests of magneto-resistive samples and sensors using an in situ, non-contact, non-destructive optical approach, without the need to determine a calibration factor between the electrical and optical measurements.

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