A New Magneto-Optic Readout Technique with High Speed and High Sensitivity

A new magneto-optic readout technique is proposed, giving high-speed, highly-sensitive readout of magnetic information stored in a recording medium with a relatively small magneto-optic rotation power. This technique is essentially a polarization modulation technique (which gives highly-sensitive re...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1981-01, Vol.20 (11), p.L821
Main Authors: Gomi, Manabu, Abe, Masanori, Nomura, Shoichiro
Format: Article
Language:English
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Summary:A new magneto-optic readout technique is proposed, giving high-speed, highly-sensitive readout of magnetic information stored in a recording medium with a relatively small magneto-optic rotation power. This technique is essentially a polarization modulation technique (which gives highly-sensitive readout) combined with the differential method (which gives high-speed readout). The new technique enables us to detect a magneto-optic rotation angle as small as 9' at a signal-to-noise ratio (SNR) of 45 dB in a 100 kHz bandwidth at 3 mW laser power (λ =632.8 nm). This value of the SNR is 15 dB larger than that obtained by the conventional differential method.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.20.L821