Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gate-Tuned Interlayer Coupling in van der Waals Ferromagnet
  Fe$_3$GeTe$_2$ Nanoflakes   The weak interlayer coupling in van der Waals (vdW) magnets has confined
their application to two dimensional (2D) spintronic devices. Here, we
demonstrate that the interlayer coupling in a vdW magnet Fe$_3$GeTe$_2$ (FGT)
can be largely modulated by a protonic gate.With the increase of the protons
intercalated among vdW layers,interlayer magnetic coupling increases.Because of
the existence of antiferromagnetic layers in FGT nanoflakes, the increasing
interlayer magnetic coupling induces exchange bias in protonated FGT
nanoflakes. Most strikingly, a rarely seen zero-field cooled (ZFC) exchange
bias with very large values (maximally up to 1.2 kOe) has been observed when
higher positive voltages (Vg>4.36 V) are applied to the protonic gate, which
clearly demonstrates that a strong interlayer coupling is realized by proton
intercalation. Such strong interlayer coupling will enable a wider range of
applications for vdW magnets.

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The categories of this paper are: patt-sol
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: astro-ph