Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tailoring Magnetic Anisotropy in Cr$_2$Ge$_2$Te$_6$ by Electrostatic
  Gating   Electrical control of magnetism of a ferromagnetic semiconductor offers
exciting prospects for future spintronic devices for processing and storing
information. Here, we report observation of electrically modulated magnetic
phase transition and magnetic anisotropy in thin crystal of Cr$_2$Ge$_2$Te$_6$
(CGT), a layered ferromagnetic semiconductor. We show that heavily
electron-doped ($\sim$ $10^{14}$ cm$^{-2}$) CGT in an electric double-layer
transistor device is found to exhibit hysteresis in magnetoresistance (MR), a
clear signature of ferromagnetism, at temperatures up to above 200 K, which is
significantly higher than the known Curie temperature of 61 K for an undoped
material. Additionally, angle-dependent MR measurements reveal that the
magnetic easy axis of this new ground state lies within the layer plane in
stark contrast to the case of undoped CGT, whose easy axis points in the
out-of-plane direction. We propose that significant doping promotes
double-exchange mechanism mediated by free carriers, prevailing over the
superexchange mechanism in the insulating state. Our findings highlight that
electrostatic gating of this class of materials allows not only charge flow
switching but also magnetic phase switching, evidencing their potential for
spintronics applications.

32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex