By Benjamin W. Chui
Microcantilevers for Atomic strength Microscope info Storage describes a learn collaboration among IBM Almaden and Stanford college within which a brand new mass facts garage know-how was once evaluated. This know-how is predicated at the use of heated cantilevers to shape submicron indentations on a polycarbonate floor, and piezoresistive cantilevers to learn these indentations.
Microcantilevers for Atomic strength Microscope facts Storage describes how silicon micromachined cantilevers can be utilized for high-density topographic facts garage on an easy substrate similar to polycarbonate. The cantilevers might be made to include resistive warmers (for thermal writing) or piezoresistive deflection sensors (for info readback).
the first viewers for Microcantilevers for Atomic ForceMicroscope info Storage is commercial and educational employees within the microelectromechanical structures (MEMS) sector. it is going to even be of curiosity to researchers within the facts garage who're investigating destiny garage technologies.
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Extra info for Microcantilevers for Atomic Force Microscope Data Storage
Sample text
5]. To operate the heater, a current pulse is passed through the cantilever to cause significant power dissipation in the heater region, resulting in a localized temperature rise. After the pulse has ended, the heat is carried away mainly by conduction down the legs to the base. ) The cooling rate mainly depends on the geometry and material of the cantilever. The rate at which the heater region cools can be described in terms of a thermal time constant. The shorter the thermal time constant, the more frequently heating pulses can be applied to the cantilever, and the higher the data writing rate.
48], making it superior to most STM-based data storage methods. In addition, it does not rely on the chemical or electrical properties of the surface of the storage medium. The medium itselfsimply a clean piece of polycarbonate-is inexpensive and easy to prepare. The data storage system can be operated in filtered room air, with no need for vacuum or cryogenic equipment. Micromachined cantilevers are an integral component in AFM thermomechanical data storage systems. 31] have since been reported.
An advantage of Type B heaters is that with phosphorus it is possible to dope silicon to higher electrical conductivity, reducing the resistance of the cantilever legs. To improve heating and cooling efficiency, Type B devices have shorter, wider legs and a heater constriction. 3 SEM images of (a) Type A, boron-doped, "non-constricted" heater- cantilever, and (b) Type B, phosphorus-doped, "constricted" heater. In each case, the region enclosed by the brackets represents the lightly doped resistive heater while the rest of the cantilever is heavily doped.
