AAWSAP DIRD, Metallic Spintronics, March 2010

The Defense Intelligence Agency's Defense Warning Office issued this Defense Intelligence Reference Document, dated 23 March 2010, as one of a series of advanced technology reports produced in FY 2009 under its Advanced Aerospace Weapon System Applications Program. The report reviews metallic spintronics, including giant magnetoresistance, spin-transfer-torque and antiferromagnetic spintronics, along with their applications. It concludes that spintronic devices could offer radiation-resistant, low-power electronics suited to aerospace use and long space trips.

From the source:Release of 2026-09-18 Incident: 3/23/10, Las Vegas, Nevada. Released with redactions. This document is a Defense Intelligence Reference Document (DIRD), a technical reference format used by the Defense Intelligence Agency (DIA) to capture baseline knowledge on a specific topic for later analytic use. DIRDs are best understood as reference and synthesis products rather than as original research. It is one of 38 DIRDs produced under the Advanced Aerospace Weapon System Applications Program (AAWSAP) between 2009 and 2011. Because AAWSAP’s scope permitted a broad range of supporting topics, not every DIRD in the series directly concerns aerospace systems or future threat assessment. The following summary reflects the DIRD’s scope and framing at the time of writing and should not be read as implying current validation of the concepts discussed. This DIRD surveys metallic spintronics, a branch of electronics that seeks to use both the electric charge and the magnetic spin of electrons to store, detect, and manipulate information, and argues that the field could lead to faster, lower-power, and more radiation-resistant devices than conventional semiconductor electronics. The report focuses on two main effects: giant magnetoresistance (GMR), which allows magnetic states to be read through changes in electrical resistance, and spin-transfer torque (STT), which allows electrical currents to change those magnetic states. The DIRD reviews their underlying physics, the experimental work then available, and possible applications in memory, sensors, oscillators, and logic devices. The document treats metallic spintronics as a promising field while emphasizing that many of its more advanced proposed applications still require substantial further development.

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(85) Xu, Y., Wang, S., Xia, K., Phys. Rev. Lett. 100, 226602 (2008).
(86) Gomonay, H., Loktev, V., Low Temp. Phys. 34, 198 (2008).
(87) Wei, Z., Sharma, A., Bass, J., Tsoi, M., J. Appl. Phys. 105, 07D113 (2009).
(88) Meiklejohn, W. H., Bean, C. P., Phys. Rev. 102, 1413 (1956).
(89) Stohr, J., Siegmann, H. C., Magnetism: from fundamentals to nanoscale dynamics
(Springer Series in Solid-State Sciences, Vol. 152, Springer, 2006).
(90) Urazhdin, S., Chien, C. L., Guslienko, K. Y., Novozhilova, L., Phys. Rev. B 73,
054416 (2006).
(91) Wei, Z., et al., Phys. Rev. Lett. 98, 116603 (2007).
(92) Urazhdin, S., Anthony, N., Phys. Rev. Lett. 99, 046602 (2007).
(93) Tang, x.-L., Zhang, H.-w., Su, H., Zhong, z.-Y., Jing, Y.-L., Appl. Phys. Lett. 91,
122504 (2007).
(94) Dai, N. V., et al., Phys. Rev. B 77, 132406 (2008).
(95) Basset, J., Sharma, A., Wei, Z., Bass, J., Tsoi, IM., Proc. SPIE 7036, 703605
(2008).
(96) Wei, Z., Basset, J., Sharma, A., Bass, J., Tsoi, IM., J. Appl. Phys. 105, 07D108
(2009).
(97) Moore, G. E., Electronics Magazine (McGraw Hill, New York, 1965).
UNCLASSIFIED/ /FOR AfiFIClt... Wili QNLY
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