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Feasibility of ultra-dense spin-tunneling random access memory

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7 Author(s)
Z. G. Wang ; Centre for Res. in Inf. Storage Technol., Plymouth Univ., UK ; D. J. Mapps ; L. N. He ; W. W. Clegg
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Three-dimensional (3-D) finite element models have been utilized to simulate electromagnetic behaviors in spin-tunneling random access memory (STram). The most significant contributors have been identified. Compared with conventional current-in-plane (CIP) giant magneto-resistive (GMR) memory, whose signal level is inversely proportional to the square root of the storage density, these current-perpendicular-to-plane (CPP) STram elements provide an excellent readout property in that their signal level is independent of their cross-section area. This result is so attractive that the density of STram should not be limited by signal degradation. Moreover, a magnetic flux closure design was found to reduce the crossfeed by about a factor of five, compared with conventional keeperless design, which is the most favored approach for achieving 109 bits/cm2 areal density. Although the storage mechanism described in this paper is made of STram, the flux-closure design could be generally applicable to other magnetic solid state memories

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IEEE Transactions on Magnetics  (Volume:33 ,  Issue: 6 )