Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bias induced up to 100% spin-injection and detection polarizations in
  ferromagnet/bilayer-hBN/graphene/hBN heterostructures   We study spin transport in a fully hBN encapsulated monolayer-graphene van
der Waals (vdW) heterostructure, at room temperature. A top-layer of
bilayer-hBN is used as a tunnel barrier for spin-injection and detection in
graphene with ferromagnetic cobalt electrodes. We report surprisingly large and
bias induced (differential) spin-injection (detection) polarizations up to 50%
(135%) at a positive voltage bias of +0.6 V, as well as sign inverted
polarizations up to -70% (-60%) at a reverse bias of -0.4 V. This demonstrates
the potential of bilayer-hBN tunnel barriers for practical graphene spintronics
applications. With such enhanced spin-injection and detection polarizations, we
report a record two-terminal (inverted) spin-valve signals up to 800 $\Omega$
with a magnetoresistance ratio of 2.7%, and we achieve spin accumulations up to
4.1 meV. We propose how these numbers can be increased further, for future
technologically relevant graphene based spintronic devices.

10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
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The categories of this paper are: hep-ex
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
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The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con