Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sub-nanosecond spin-torque switching of perpendicular magnetic tunnel
  junction nanopillars at cryogenic temperatures   Spin-transfer magnetic random access memory is of significant interest for
cryogenic applications where a persistent, fast, low-energy consumption and
high device density is needed. Here we report the low-temperature nanosecond
duration spin-transfer switching characteristics of perpendicular magnetic
tunnel junction (pMTJ) nanopillar devices (40 to 60 nm in diameter) and
contrast them to their room temperature properties. Interestingly, at fixed
pulse voltage overdrive the characteristic switching time decreases with
temperature, in contrast to macrospin model predictions, with the largest
reduction in switching time occurring between room temperature and 150 K. The
switching energy increases with decreasing temperature, but still compares very
favorably to other types of spin-transfer devices at 4 K, with < 300 fJ
required per switch. Write error rate (WER) measurements show highly reliable
(WER <= 5x10^-5 with 4 ns pulses at 4 K) demonstrating the promise of pMTJ
devices for cryogenic applications and routes to further device optimization.

18
The categories of this paper are: econ
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an