Non-volatile MEMS micro-relays using magnetic actuators

Details Non-volatile MEMS micro-relays using magnetic actuators Non-volatile MEMS micro-relays using magnetic actuators

1999-10-15

2000-09-26

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Rotary

310DIG6, 335 78, 335128, 335 79, 335 80, H02K 3310

Patent

active

061246506

ABSTRACT:
An actuation device employing square-loop latchable magnetic material having a magnetization direction (polarization) capable of being changed in response to exposure to an external magnetic field is disclosed. The magnetic field is created by a conductor assembly with non-solenoid configuration. Once the magnetization direction of the material is so changed, the external magnetic field is no longer required to maintain the new magnetization direction. The latchable magnetic material is disposed on the mobile electrode of a switching device, and another magnetic material is disposed in spaced relation to the latchable magnetic material on a stationary electrode or surface. By applying an electrical current to a conductor assembly arranged proximate the latchable material, a magnetic field is created about the latchable magnetic material, to change the magnetization direction and thereby enable the attraction or repulsion of another magnetic material located on the stationary electrode. The resulting relative displacement of the mobile and stationary electrodes effects the selective connection or disconnection of electrical contacts carried on or associated with the respective electrodes of the actuation device without requiring additional power in order to maintain the switched state of the electrodes.

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S. Jin, et al., High Frequency Properties of Fe-Cr-Ta-N Soft Magnetic Materials, published in Applied Physics Letters vol. 70, p. 3161, 1997.

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