Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultrafast antiferromagnetic switching in NiO induced by spin transfer
  torques   NiO is a prototypical antiferromagnet with a characteristic resonance
frequency in the THz range. From atomistic spin dynamics simulations that take
into account the crystallographic structure of NiO, and in particular a
magnetic anisotropy respecting its symmetry, we describe antiferromagnetic
switching at THz frequency by a spin transfer torque mechanism. Sub-picosecond
S-state switching between the six allowed stable spin directions is found for
reasonably achievable spin currents, like those generated by laser induced
ultrafast demagnetization. A simple procedure for picosecond writing of a
six-state memory is described, thus opening the possibility to speed up current
logic of electronic devices by several orders of magnitude.

17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph