Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Asymmetric switching behavior in perpendicularly magnetized spin-valve
  nanopillars due to the polarizer dipole field   We report the free layer switching field distributions of spin-valve
nanopillars with perpendicular magnetization. While the distributions are
consistent with a thermal activation model, they show a strong asymmetry
between the parallel to antiparallel and the reverse transition, with energy
barriers more than 50% higher for the parallel to antiparallel transitions. The
inhomogeneous dipolar field from the polarizer is demonstrated to be at the
origin of this symmetry breaking. Interestingly, the symmetry is restored for
devices with a lithographically defined notch pair removed from the midpoint of
the pillar cross-section along the ellipse long axis. These results have
important implications for the thermal stability of perpendicular magnetized
MRAM bit cells.

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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: math
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The categories of this paper are: nlin
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The categories of this paper are: econ
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The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex