Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Classical and quantum depinning of a domain wall with a spin-polarized
  current   We study in detail the classical and quantum depinning of a domain wall (DW)
induced by a fast-varying spin-polarized current. By confirming the adiabatic
condition for calculating the spin-torque in fast-varying current case, we show
that the time-dependent spin current has two critical values that determine the
classical depinning of DW. This discovery successfully explains the recent
experiments. Furthermore, a feasible way is proposed to lower the threshold of
spin currents and control the direction of DW's motion. Finally, the quantum
properties for the depinning of DW are also investigated in this paper.

29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg