Tech Briefs Magazine - March 2022 - 26

Electrical/Electronics
through the room while trapping electric
fields inside the capacitors themselves.
This overcomes a limitation of
previous wireless power systems, which
are limited to either delivering large
amounts of power over a few millimeters
or very small amounts of power over
long distances.
A second hurdle was how to generate a
magnetic field that reaches every corner
of the room - magnetic fields tend to
travel in circular patterns, creating dead
spots in a square room. In addition, receivers
need to align with the field in a
specific way to draw power.
To make that happen, the system generates
two separate 3D magnetic fields.
One travels in a circle around the room's
central pole while the other swirls in
the corners, traveling between adjacent
walls. This approach eliminates dead
spots, enabling devices to draw power
from anywhere in the space.
Tests
with
Lumped capacitors set into wall cavities in the wireless charging room. (Photo: University of Tokyo)
The innovation could be implemented
in new construction; however, retrofits
also would be possible. Some commercial
buildings, for example, already
have metal support poles and it should
be possible to spray a conductive surface
onto walls, perhaps similar to how textured
ceilings are applied.
A key to making the system work was
building a resonant structure that could
deliver a room-size magnetic field while
confining harmful electric fields, which
can heat biological tissues. The team's
solution used devices called lumped
capacitors. Placed in wall cavities, they
generate a magnetic field that resonates
anatomical
dummies
showed that the system could deliver at
least 50 watts of power to any location
in the room without exceeding FCC
guidelines for electromagnetic energy
exposure. It is likely, however, that it
will be possible to deliver higher levels
of power with further refinement of
the system.
For more information, contact Kate
McAlpine at kmca@umich.edu.
Superlattice for Sustainable Quantum Electronics
The material could potentially provide a platform for error-free quantum computing.
City College of New York, New York City, NY
A
team of researchers has created a
new topological magnetic superlattice
material that, at a high temperature,
can conduct electrical current
without dissipation and lost energy.
The finding could be the basis of research
leading to an entire new quantum
materials class that can potentially
provide a platform for error-free quantum
computing.
The material, in the form of crystals,
is created in a laboratory chamber. Atoms,
in this process, naturally arrange
into well-organized layers - a novel
ordered magnetic superlattice. The
research centers around the Quantum
Anomalous Hall Effect (QAHE),
which describes an insulator that conducts
dissipation-less current in discrete
channels on its surfaces. Because
26
QAHE current does not lose energy as
it travels, it is akin to a superconducting
current and has the potential, if
industrialized, to advance energy-efficient
technologies.
The main advance of this work is that
the new higher-temperature QAHE
regime is robust, eminently tunable
through electron irradiation and thermal
vacancy redistribution, and can
be modified on-demand by adjusting
the superlattice sequence, leading to a
platform for topological superconductivity.
The researchers can advance this
platform to other topological magnets.
The ultimate goal would be to help
transform future quantum electronics
with the material.
For more information, contact Jay Mwamba
at jmwamba@ccny.cuny.edu; 212-650-7580.
www.techbriefs.com
Rendering of the new topological ferromagnet
that can be tuned into quantized conductivity
state using high-energy electron beams.
(Photo: Lukas Zhao)
Tech Briefs, March 2022
TB Electrical Electronics 0322_1.indd 26
Cov
ToC
2/15/22 1:39 PM
http://www.techbriefs.com http://info.hotims.com/82319-780

Tech Briefs Magazine - March 2022

Table of Contents for the Digital Edition of Tech Briefs Magazine - March 2022

Tech Briefs Magazine - March 2022 - Intro
Tech Briefs Magazine - March 2022 - Sponsor
Tech Briefs Magazine - March 2022 - Cov1
Tech Briefs Magazine - March 2022 - Cov2
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