1,193 research outputs found
Theory of Spin Torque Assisted Thermal Switching of Single Free Layer
The spin torque assisted thermal switching of the single free layer was
studied theoretically. Based on the rate equation, we derived the theoretical
formulas of the most likely and mean switching currents of the sweep current
assisted magnetization switching, and found that the value of the exponent
in the switching rate formula significantly affects the estimation of the
retention time of magnetic random access memory. Based on the Fokker-Planck
approach, we also showed that the value of should be two, not unity as
argued in the previous works.Comment: submitted to IEEE Trans. Magn. as the conference proceedings of
Intermag 201
Boundary state of superstring in open string channel
We derive boundary state of superstring in the open string channel. It
describes the superconformal field theory of open string emission and
absorption by D-brane. We define the boundary state by conformal mappings from
upper half plane with operators inserted at two points corresponding to the
corners of semi-infinite strip. We obtain explicit oscillator forms
analytically for the fermion and superconformal ghost sectors. For the fermion
sector we compare this with numerical result obtained by using naive boundary
condition.Comment: 20 pages, 2 figures, PTPTeX; typos corrected, minor change
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