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Magnetostrictive Positioner Disclosure Number: IPCOM000063662D
Original Publication Date: 1985-Apr-01
Included in the Prior Art Database: 2005-Feb-18

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Gerber, C Marti, O [+details]


Xyz-positioners can be built from magnetostrictive materials, such as iron, nickel, etc., to permit the positioning of objects in the nanometer/micrometer range. Three legs 1, 2, 3 extending along the x, y, z directions, respectively, are joined at a knee 4 where the object to be displaced is fixed, e.g., the tip 5 of a scanning tunneling microscope. Each of the legs 1, 2, 3 consists of magnetostrictive material and carries a magnet coil 6, 7, 8, respectively, which can be individually controlled to produce a magnetic field about its associated leg. In the case of nickel, for example, the dilatation coefficient is -6$10-7m/m$Oe. Accordingly, a nickel bar of 50 mm length will undergo a dilation of 1.5 mm in a field of 50 Oe. A coil with 10,000 windings will produce such a field with a current of 20 mA.