| Current-induced domain-wall switching in a ferromagnetic semiconductor structure. | |
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MedLine Citation:
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PMID: 15057826 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Magnetic information storage relies on external magnetic fields to encode logical bits through magnetization reversal. But because the magnetic fields needed to operate ultradense storage devices are too high to generate, magnetization reversal by electrical currents is attracting much interest as a promising alternative encoding method. Indeed, spin-polarized currents can reverse the magnetization direction of nanometre-sized metallic structures through torque; however, the high current densities of 10(7)-10(8) A cm(-2) that are at present required exceed the threshold values tolerated by the metal interconnects of integrated circuits. Encoding magnetic information in metallic systems has also been achieved by manipulating the domain walls at the boundary between regions with different magnetization directions, but the approach again requires high current densities of about 10(7) A cm(-2). Here we demonstrate that, in a ferromagnetic semiconductor structure, magnetization reversal through domain-wall switching can be induced in the absence of a magnetic field using current pulses with densities below 10(5) A cm(-2). The slow switching speed and low ferromagnetic transition temperature of our current system are impractical. But provided these problems can be addressed, magnetic reversal through electric pulses with reduced current densities could provide a route to magnetic information storage applications. |
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Authors:
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M Yamanouchi; D Chiba; F Matsukura; H Ohno |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Nature Volume: 428 ISSN: 1476-4687 ISO Abbreviation: Nature Publication Date: 2004 Apr |
Date Detail:
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Created Date: 2004-04-01 Completed Date: 2004-04-14 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0410462 Medline TA: Nature Country: England |
Other Details:
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Languages: eng Pagination: 539-42 Citation Subset: - |
Affiliation:
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Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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