Magnetic disks

Figure Bl.19.22. Magnetic force microscopy image of an 8 pm wide track on a magnetic disk. The bit transitions are spaced every 2 pm along the track. Arrows point to the edges of the DC-erased region. (Taken from [109], figure 7.)...

Sandia Systems Inc., Albuquerque, NM, and TMATechnologies, Inc., Bozeman, MT. Sandia systems specializes in systems for characterizing microelectronics and magnetic disk materials TMA emphasizes optical materials characterization. 

Procedures that are formally laid down in a reproducible medium such as paper or magnetic disk. 

Fig. 5 Schematic of the read/write head-magnetic disk interface.

Ultra-thin DLC Coatings in Magnetic Disk Driver... 

Poon, C. Y. andBhhushan, B., Surface Roughness Analysis of Glass-Ceramic Substrates and Finished Magnetic Disks, and Ni-P Coated Al-Mg and Glass Substrates," Wear, Vol. 190, 1995,pp. 89-109. 

The magnets utilized in these systems are typically neodymium-iron or samarium-cobalt disks with appropriately designed pole shoes that are placed with a variable air gap between them to accommodate an NMR probe designed to allow sample tubes (or flow probes) of 5 0 mm diameter. The magnet disks are typically wrapped along their sides with double wound wire to heat magnets to maintain a stable 35 °C operating... 

Data generated by nonagent CEMS instruments are recorded both on chart recorders and electronically for transmission to the process data acquisition recording (PDAR) system for recording on magnetic disks (EG G, 1994). Data are archived both as hard copy (e.g., instrument service logbooks, recorder charts, cali-... 

Chou, S. Y., Krauss, P. R., and Kong, L. S., Nanolithograpically defined magnetic structures and quantum magnetic disk. J. Appl. Phys 79,6101 (1996). 

Without doubt, however, the greatest difference between the two is that the sophisticated electronics of the newer instrument enable it to be directly connected to an Infrared Data Station , a microcomputer system which can smooth spectra, produce an average spectrum from a number of scans, subtract one spectrum from another, or reformat a spectrum. In addition, it is possible to identify possible structural features of an unknown compound and to match the spectrum against a reference library stored on magnetic disks, to facilitate a rapid identification of unknowns3). It is interesting to note that the basic optical specifications of the two instruments are not all that dissimilar ... 

Figure 3. Examples of microstructures of dissimilar materials, (a) Microelectronic device, (b) Optical fiber, (c) Magnetic disk.

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