Scratch-related magnetic signal degradation can occur during magnetic storage hard disk drive operation when the read-write heads contact the spinning multilayer disks. To investigate this phenomenon controlled nanoscratch experiments were performed on perpendicular magnetic recording media using various indenters of different radii of curvature. Various loading conditions were used to cause permanent scratches that were measured using atomic force microscopy. The nanoscratch experiments were simulated using finite element analysis (FEA) that included the detailed nanometer scale thin-film multilayer mechanical properties. The permanently deformed field in the sub-surface magnetic recording layer was extracted from the FEA results. The residual scratch widths measured on the surface of the magnetic storage disk were directly compared with the residual sub-surface widths of the region on the magnetic recording layer where extensive permanent lateral deformation was present. It was found that the sub-surface widths of the deformed regions were significantly larger than the surface scratch widths. Thus, sub-surface thin-film layers, such as the magnetic recording layer could be damaged without observable damage to the protective top surface carbon overcoat. The exact location and extent of damage to the magnetic recording layer depends on the scratch load, size of scratch tip, and the friction at the interface. Such permanent deformation in magnetic recording layer could lead to demagnetization, which has been reported in the literature.
Skip Nav Destination
ASME/STLE 2009 International Joint Tribology Conference
October 19–21, 2009
Memphis, Tennessee, USA
Conference Sponsors:
- Tribology Division
ISBN:
978-0-7918-4895-1
PROCEEDINGS PAPER
Experimental and FEA Scratch Correlation of Magnetic Signal Degradation in Magnetic Storage Thin-Film Disks
Raja R. Katta,
Raja R. Katta
University of Illinois at Urbana-Champaign, Urbana, IL
Search for other works by this author on:
Andreas A. Polycarpou,
Andreas A. Polycarpou
University of Illinois at Urbana-Champaign, Urbana, IL
Search for other works by this author on:
Sung-Chang Lee,
Sung-Chang Lee
Samsung Information Systems America, San Jose, CA
Search for other works by this author on:
Mike Suk
Mike Suk
Samsung Information Systems America, San Jose, CA
Search for other works by this author on:
Raja R. Katta
University of Illinois at Urbana-Champaign, Urbana, IL
Andreas A. Polycarpou
University of Illinois at Urbana-Champaign, Urbana, IL
Sung-Chang Lee
Samsung Information Systems America, San Jose, CA
Mike Suk
Samsung Information Systems America, San Jose, CA
Paper No:
IJTC2009-15119, pp. 407-410; 4 pages
Published Online:
February 16, 2010
Citation
Katta, RR, Polycarpou, AA, Lee, S, & Suk, M. "Experimental and FEA Scratch Correlation of Magnetic Signal Degradation in Magnetic Storage Thin-Film Disks." Proceedings of the ASME/STLE 2009 International Joint Tribology Conference. ASME/STLE 2009 International Joint Tribology Conference. Memphis, Tennessee, USA. October 19–21, 2009. pp. 407-410. ASME. https://doi.org/10.1115/IJTC2009-15119
Download citation file:
2
Views
Related Proceedings Papers
Related Articles
Nanotribological and Nanomechanical Properties of Ultrathin Amorphous Carbon Films Synthesized by Radio Frequency Sputtering
J. Tribol (July,2001)
Friction and Wear Micromechanisms of Amorphous Carbon Thin Films
J. Tribol (October,1997)
Related Chapters
A Utility Perspective of Wind Energy
Wind Turbine Technology: Fundamental Concepts in Wind Turbine Engineering, Second Edition
Surface Analysis and Tools
Tribology of Mechanical Systems: A Guide to Present and Future Technologies
Data Tabulations
Structural Shear Joints: Analyses, Properties and Design for Repeat Loading