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"Giant room-temperature
magnetoresistance in single-crystal Fe/MgO/Fe magnetic tunnel junctions,"
by Shinji Yuasa and 4 others, Nature Materials, 3(12): 868-71, December
2004.
[Authors' affiliation: National Institute of
Advanced Industrial Science and Technology (AIST), Tsukuba, Japan]
Introduction:
The tunnel magnetoresistance (TMR) effect in magnetic tunnel junctions (MTJs)
is the key to developing magnetoresistive random-access-memory (MRAM),
magnetic sensors and novel programmable logic devices. Conventional MTJs with
an amorphous aluminum oxide tunnel barrier, which have been extensively
studied for device applications, exhibit a magnetoresistance ratio up to 70%
at room temperature. This low magnetoresistance seriously limits the
feasibility of spintronics devices. Here, we report a giant MR ratio up to
180% at room temperature in single-crystal Fe/MgO/Fe MTJs. The origin of this
enormous TMR effect is coherent spin-polarized tunnelling, where the symmetry
of electron wave functions plays an important role. Moreover, we observed that
their tunnel magnetoresistance oscillates as a function of tunnel barrier
thickness, indicating that coherency of wave functions is conserved across the
tunnel barrier. The coherent TMR is a key to making spintronic devices with
novel quantum-mechanical functions, and to developing gigabit-scale MRAM."
This 2004 report from Nature Materials
was cited 38 times in current journal articles indexed by
Thomson Scientific during May-June 2006. Only two other papers published in
the last two years and indexed under the broad heading of physics (not
counting reviews) received a greater number of citations during that two-month
period. Prior to the most recent bimonthly count, citations to the paper have
accrued as follows:
March-April 2006: 11 citations
January-February 2006: 18
November-December 2005: 16
September-October 2005: 12
July-August 2005: 8
May-June 2005: 8
January-February 2005: 1
November-December 2004: 1
Total citations to date: 113
SOURCE: Hot
Papers Database (Included with a subscription to the print newsletter Science
Watch®, available from the
Research Services Group. Packaged on a CD that is mailed with each Science
Watch issue, the Hot
Papers Database contains data on hundreds of highly cited papers published
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