1 January 2005 Second-harmonic magnetoresistive imaging to authenticate and recover data from magnetic storage media
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J. of Electronic Imaging, 14(1), 013015 (2005). doi:10.1117/1.1866150
Abstract
A scanning magnetoresistive (MR) microscope is developed for high-resolution imaging of magnetic tapes and digital media. Second-harmonic detection is used to remove thermal anomalies. We are able to image sufficient lengths of tape for authentication purposes and for data recovery from damaged samples. The second-harmonic technique provides high-contrast magnetic images of the magnetic storage media using high-resolution MR sensors from commercial hard disk drives. These images can be directly converted into the originally recorded analog audio waveforms or digital data.
David P. Pappas, A. V. Nazarov, D. Stevenson, Stephen D. Voran, Michael E. Read, E. M. Gormley, Jim Cash, Ken Marr, James J. Ryan, "Second-harmonic magnetoresistive imaging to authenticate and recover data from magnetic storage media," Journal of Electronic Imaging 14(1), 013015 (1 January 2005). http://dx.doi.org/10.1117/1.1866150
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KEYWORDS
Magnetism

Sensors

Head

Signal to noise ratio

Analog electronics

Magnetic sensors

Magnetic resonance imaging

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