Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Voltage Control of Uni-directional Anisotropy in
  Ferromagnet-Multiferroic System   Demonstration of ultra-low energy switching mechanisms is an imperative for
continued improvements in computing devices. Ferroelectric (FE) and
multiferroic (MF) orders and their manipulation promises an ideal combination
of state variables to reach atto-Joule range for logic and memory (i.e., ~ 30X
lower switching energy than nanoelectronics). In BiFeO3 the coupling between
the antiferromagnetic (AFM) and FE orders is robust at room temperature,
scalable in voltage, stabilized by the FE order, and can be integrated into a
fabrication process for a beyond-CMOS era. The presence of the AFM order and a
canted magnetic moment in this system causes exchange interaction with a
ferromagnet such as CoFe or LSMO. While previous work has shown that exchange
coupling (uniaxial anisotropy) can be controlled with an electric field,
several puzzling issues remain. Perhaps the most intriguing among them is that
the BiFeO3-CoFe bilayer did not demonstrate any electrically controlled
directional anisotropy, i.e., an exchange bias, which is a potential mechanism
for 180o magnetic reversal and is independent of switching kinetics. However,
what is needed/preferred for logic and memory is a magneto-electric mechanism
that works analogous to an applied field, i.e a uni-directional anisotropy that
is voltage modulated. Here, we present the evidence of electrical control of
exchange bias of a laterally scaled spin valve that is exchange-coupled to
BiFeO3 at room temperature. We show that the exchange bias in this bilayer is
thermally robust, electrically controlled and reversible. We anticipate that
magneto-electricity at such scaled dimensions provides a powerful pathway for
computing beyond the modern nanoelectronics transistors by enabling a new class
of non-volatile, ultra-low energy computing elements.

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The categories of this paper are: q-bio
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The categories of this paper are: stat
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: astro-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-alg