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This Defense Intelligence Reference Document, dated 23 March 2010 and produced by the Defense Intelligence Agency under its Advanced Aerospace Weapon System Applications (AAWSA) program, is a technical report on metallic spintronics. It explains giant magnetoresistance, spin-transfer torque and antiferromagnetic spintronics, along with their uses in sensors, hard drive read heads and magnetic memory. It concludes that spintronic devices could enable low-power, radiation-resistant electronics suited to aerospace and long space missions.
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UNCLASSIFIED/,S&8A 8&1il&ll1k W&& 8tJW Contents 1. Introduction .......................................................................................................... iv 2. Giant Mag netoresistance ..................................................................................... 1 2.1 GMR Basics ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• !!1••···························· 1 2.2 GM.R Applications .........................................~ .......................... ., ........................ 3 3. Spin-Transfer-Torque ......................................................................................... 4 3.1 STT. Basics .................................................................................................................. 4 3.2 STT Experiments ..................................................................................................................... 7 3. 3 STT Appllcat~ons ........................................................................................... 10 3,4 STT-Driven Motion of Magnetic Domain Walls ........................................... 12 4. Antiferromagnetic Metal Sl)lntro..nics ......................................................................•...... 12 4.1 Antiferromagnetic GMR ............................................................................. 13 4. 2 Antlferromag netlc STT................................................."' .................................... 14 5 .. Summary and Conclusion~ ................................................................................... 16 6 .. References .................... ,.................................................................................................. 18 Figures Figure 1. In a Magnetic Multilayer, Several Atomic Layers of Magnetic Material Alternate With Layers of Nonmagnetic Material ...................................... 1 Figure 2. Resistance of a Magnetic Multilayer R Versus Magnetic Field .................. 2 Figure 3. Differential Resistance dV/dl of a Mechanical Point Contact as a Fur,ction of Current for a Series of Magnetic Fields................................................ 4 Figure 4. Device Schematics for STT Experiments ................................................. . Figure 5. Qualitative Picture of STT .................................................................................... Figure 6. Torques on a Magnetic Moment In a Magnetic Field and Subject to an 5 6 Electrical Current ....................................................................................... 7 Figure 7. Spin-Torque-Driven Magnetic Switching .................................................. 8 figure 8. Oscillatory Voltage .............................................................................................. 9 Figure 9. Scanning Transmission X-ray Microscopy Images ................................. 10 Figure 10. Conventional MRAM. Cell .............................................................................. 11 Flgu re 11. Racetrack Memory Co nee.pt .................................................................... 12 Figure 12. Schematic of Point Contact to Sample Geometry ................................. 15 iii UNCLASSIFIED/;1P8R: 8PPll!IIIII: ltOI!! 8HLY
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Report, from the dia collection. The PDF is mirrored here; the original link is under it. 27 pages are in the text index: search them above, or from the library's search.