Passive Anti-Tamper Latching Stress Sensors for Volume Protection

Award Information
Agency: Department of Defense
Branch: Missile Defense Agency
Contract: W9113M-08-C-0186
Agency Tracking Number: B063-052-0314
Amount: $992,687.00
Phase: Phase II
Program: SBIR
Awards Year: 2008
Solicitation Year: 2006
Solicitation Topic Code: MDA06-052
Solicitation Number: 2006.3
Small Business Information
11409 Valley View Road, Eden Prairie, MN, 55344
DUNS: 114264351
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 James Deak
 Senior Physicist
 (952) 996-1636
Business Contact
 John Myers
Title: Vide President of Develop
Phone: (952) 996-1610
Research Institution
This Small Business Innovation Research Phase II proposal describes a latching anti-tamper (AT) stress sensor (LATSS) for volumetric protection of military systems. LATSS devices are intended to passively detect and remember if a change in some mechanical aspect of the shield enclosing a protected volume has occurred and provide a signal that can be queried to report the change. They are based on spin dependent tunnel (SDT) junctions utilizing magnetostrictive ferromagnetic electrodes. Magnetostrictive SDT junctions provide a unique combination of capabilities for an AT sensor. The hysteretic magnetic behavior of the SDT electrodes provides the capability to record a change in stress without applied power. The magnetoresistance of the SDT junctions permits electrical readout of the orientation of the magnetization of the ferromagnetic sensor electrodes, which is set by magnetostrictive coupling to the substrate strain. SDT devices can be fabricated using standard back end of line semiconductor processes, potentially making LATSS a low cost volumetric AT solution. Because of their small size, several LATSS devices could be combined on the same substrate to produce a cryptokey memory, providing a new class of passive tamper-responsive cryptokey memory. Additionally, SDT materials are intrinsically radiation hard, permitting development of radiation hard LATSS devices.

* Information listed above is at the time of submission. *

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