DOW-UAP-D129, AAWSAP DIRD, Metallic Spintronics, March 2010

Department of War · 3/23/10 · Las Vegas, Nevada · Document

DOW-UAP-D129, AAWSAP DIRD, Metallic Spintronics, March 2010 is indexed as a Department of War record with incident date 3/23/10 and location Las Vegas, Nevada. 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. Redactions have been made to protect the identity of eyewitnesses, the location of government facilities, or potentially sensitive information about military sites not related to UAP. No redactions have been made to any files released under President Trump's directive concerning information about the nature or existence of any encounter reported as a UAP or related phenomena.

Notable / anomalous element

• Spintronics in ferromagnetic systems is built on a complementary set of phenomena in which the magnetic configuration of the system influences its transport properties and vice versa. (native PDF text, page 4)
• The physics and applications of metallic spintronics are discussed in this report from the perspec:tive of these two phenomena. (native PDF text, page 4)
• Reading information stored on magnetic har d disk drives in computers was the first large-sca le commercial application of GMR. (native PDF text, page 8)
• In principle, this can be accomplished by the use of synchrotron x-rays that were recently shown (Reference 52) to probe interfacial phenomena and directly image the time-resolved response of magnetic nanostructures to sub-nanosecond magnetic field pulses (Oersted switching) and spin-polarized current 9 UNCLASSIFIED/. (native PDF text, page 14)

Details

• This product is one in a series of advanced technology reports produced in FY 2009 under the Defense Intelligence Agency, Defense Warning Office's Advanced Aerospace Weapon System Applications (AAWSA) Program. (native PDF text, page 2)
• Comments or questions pertaining to I this document should be addressed to!AAP Person 1 AAWSA Prog ram Manager, Defense Intelligence Agency, ATTN: CLAR/DW0-3, Bldg 6000, Washington, DC 20340-5100. ii UNCLASSIFIED/ /FQA QFFi Giillk W&& 9t Jb (native PDF text, page 2)
• 10 3.4 STT-Driven Motion of Magnetic Domain Walls. (native PDF text, page 3)
• In a Magnetic Multilayer, Several Atomic Layers of Magnetic Material Alternate With Layers of Nonmagnetic Material. (native PDF text, page 3)
• Resistance of a Magnetic Multilayer R Versus Magnetic Field. (native PDF text, page 3)
• Device Schematics for STT Experiments. (native PDF text, page 3)
• Torques on a Magnetic Moment in a Magnetic Field and Subject to an Electrical Current. (native PDF text, page 3)
• Spin-Torque-Driven Magnetic Switching. (native PDF text, page 3)

Tags: War Department, Nevada, AAWSAP, Technical research, Weapons, Discs