Spin torque transfer structure with new spin switching configurations |
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Authors: | J-P Wang H Meng |
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Institution: | (1) The Center for Micromagnetics and Information Technologies (MINT) & Department of Electrical & Computer Engineering, University of Minnesota, Minneapolis, MN 55455, USA |
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Abstract: | Spin torque transfer structures with new spin switching configurations are
proposed, fabricated and investigated in this paper. The non-uniform
current-induced magnetization switching is implemented based on both GMR and
MTJ nano devices. The proposed new spin transfer structure has a hybrid free
layer that consists of a layer with conductive channels (magnetic) and
non-conductive matrix (non-magnetic) and traditional free layer(s). Two
mechanisms, a higher local current density by nano-current-channels and a
non-uniform magnetization switching (reversal domain nucleation and growth)
by a magnetic nanocomposite structure, contribute in reducing the switching
current density. The critical switching current density for the new spin
transfer structure is reduced to one third of the typical value for the
normal structure. It can be expected to have one order of magnitude or more
reduction for the critical current density if the optimization of materials
and fabrication processes could be done further. Meanwhile, the thermal
stability of this new spin transfer structure is not degraded, which may
solve the long-standing scaling problem for magnetic random access memory
(MRAM). This spin transfer structure, with the proposed and demonstrated new
spin switching configurations, not only provides a solid approach for the
practical application of spin transfer devices but also forms a unique
platform for researchers to explore the non-uniform current-induced
switching process. |
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Keywords: | 72 25 -b Spin polarized transport 72 25 Ba Spin polarized transport in metals 73 63 -b Electronic transport in nanoscale materials and structures 75 47 -m Magnetotransport phenomena materials for magnetotransport |
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