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Second-harmonic magnetoresistive imaging to authenticate and recover data from magnetic storage media

[+] Author Affiliations
D. P. Pappas, A. V. Nazarov, D. Stevenson

National Institute of Standards and Technology, Boulder, Colorado 80305

S. Voran

Institute for Telecommunication Sciences, Boulder, Colorado 80305

M. E. Read

Physical Sciences, Inc., Alexandria, Virginia 22312

E. M. Gormley, J. Cash

National Transporation Safety Board, Vehicle Recorders Division, Washington, D.C., 20594

K. Marr, J. J. Ryan

FBI Engineering Research Facility, Audio Laboratory, Quantico, Virginia 22135

J. Electron. Imaging. 14(1), 013015 (Mar. 30, 2005). doi:10.1117/1.1866150
History: Received Nov. 28, 2000; Revised Mar. 31, 2002; Accepted May 14, 2004; Mar. 30, 2005; Online March 30, 2005
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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. © 2005 SPIE and IS&T.

© 2005 SPIE and IS&T

Citation

D. P. Pappas ; A. V. Nazarov ; D. Stevenson ; S. Voran ; M. E. Read, et al.
"Second-harmonic magnetoresistive imaging to authenticate and recover data from magnetic storage media", J. Electron. Imaging. 14(1), 013015 (Mar. 30, 2005). ; http://dx.doi.org/10.1117/1.1866150


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