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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.
“metallic”13 pages
UNCLASSIFIED/ ;fEOR OEF!CiilJzL W&li a,11::r.r pulses (STT switching). Figure 9 shows scanning transmission x-ray microscopy (Reference 53) images of in-plane components of magnetization M - Mx in panel (a) and My in panel (b}-in the free CoFe layer (indicated by blue ellipse) of a 100x150-nm2 magnetic nanopillar. The images were obtained by scanning a focused (diameter~ 30 nm) circularly polarized x-ray beam across the CoFe layer, with the photon energy tuned to the characteristic Co L3 resonance to provide magnetic contrast through the x- ray magnetic circular dichroism effect (Reference 54), and by monitoring transmission of the x-rays as a function of the position x, y with a fast avalanche detector. The M- - vector field of the free layer can be reconstructed from the measured Mx and Mv components as illustrated in Figure 9c, and the ultrafast x-ray microscopy technique provided a means to monitor this field as a function of time with ~100-picosond resolution. The spatial resolution of the technique is set by the spot size of the x-ray beam (~30 nm) and currently limits its application to spintronic devices >100 nm in size (Reference 52). Potentially, however, technical development of the ultrafast.x-ray microscopy may lead to an ultimate technique for STT studies that can probe the M- vector field on the nanometer length scale with picosecond time resolution. (a) (b) (c) Figure 9. Scanning transmission 1 100 GHz by changing the applied magnetic field and/or the de current, effectively resulting in a current- controlled oscillator for use in practical microwave circuits. Hence, the SIT effett in 10 UNCLASSIFIED/./JiQA GIFJiIGl11iL UG'& a•11w_-r
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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.