Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin-polarized light emitting diode using metal/insulator/semiconductor
  structures   We have succeeded in growing ferromagnetic metals (Co, Fe, and NiFe)/ Al2O3/
AlGaAs heterostructures with homogeneous and flat interfaces. The
electro-luminescence (EL) from the light emitting diode (LED) consisting of the
metal/insulator/semiconductor (MIS) structure depends on the magnetization
direction of the ferromagnetic electrode at room temperature. This fact shows
that a spin-injection from the ferromagnetic metal to the semiconductor is
achieved. The spin-injection efficiency is estimated to be the order of 1 % at
room temperature.

25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci