TAILIEUCHUNG - Smart Material Systems and MEMS - Vijay K. Varadan Part 2

Tham khảo tài liệu 'smart material systems and mems - vijay k. varadan part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 22 Smart Material Systems and MEMS In addition to several elemental metals various alloys have also been developed for MEMS. CoNiMn thin films have been used as permanent magnet materials for magnetic actuation. NiFe permalloy thick films have been electroplated on silicon substrates for magnetic MEMS devices such as micromotors micro-actuators microsensors and integrated power converters 14 . TiNi shape memory alloy SMA films have been sputtered onto various substrates in order to produce several well-known SMA actuators 16 . Similarly TbFe and SmFe thin films have also been used for magnetostrictive actuation 17 . CERAMICS Ceramics are another major class of materials widely used in smart systems. These generally have better hardness and high-temperature strength. The thick ceramic film and three-dimensional 3D ceramic structures are also necessary for MEMS for special applications. Both crystalline as well as non-crystalline materials are used in the context of MEMS. For example ceramic pressure microsensors have been developed for pressure measurement in high-temperature environments 16 silicon carbide MEMS for harsh environments 18 etc. In addition to these structural ceramics some functional ceramics such as ZnO and PZT have also been incorporated into smart systems. New functional microsensors micro-actuators and MEMS can be realized by combining ferroelectric thin films having prominent sensing properties such as pyroelectric piezoelectric and electro-optic effects with micro devices and microstructures. There are several such ferroelectric materials including oxides and nonoxides and their selection depends on a specific application. Generally ferroelectric oxides are superior to ferroelectric non-oxides for MEMS applications. One useful ferroelectric thin film studied for microsensors and RF-MEMS is barium strontium titanate 19 . Hence as a typical example we will concentrate on this material and its preparation method in this section. Barium .

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