  A vast majority of electrical devices have integrated magnetic units, which
generate constant magnetic fields with noticeable vibrations. The majority of
existing nanogenerators acquire energy through friction/mechanical forces and
most of these instances overlook acoustic vibrations and magnetic fields.
Magnetic two-dimensional (2D) tellurides present a wide range of possibilities
for devising a potential flexible energy harvester. We have synthesized
two-dimensional chromium telluride (2D CrTe3) which exhibits ferromagnetic (FM)
nature with a Tc of 224 K. The structure exhibits stable high remnant
magnetization, making 2D CrTe3 flakes a potential material for harvesting of
magneto-acoustic waves at room temperature. A magneto-acoustic nanogenerator
(MANG) was fabricated composing of 2D CrTe3 dispersed in a polymer matrix.
Basic mechanical stability and sensitivity of the device with change in load
conditions were tested. A high surface charge density of 2.919 mC m-2 was
obtained for the device. The thermal strain created in the lattice structure
was examined using in-situ Raman spectroscopic measurements. The magnetic
anisotropy energy (MAE) responsible for long-range FM ordering was calculated
with the help of theoretical modelling. The theoretical calculations also
showed opening of electronic bandgap which enhances the flexoelectric effects.
The MANG can be a potential energy harvester to synergistically tap into the
magneto-acoustic vibrations generated from the frequency changes of a vibrating
device such as loudspeakers.
