David P. Arnold
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Using magnetic nanoparticles to explore symbiotic interactions Open
All plants and animals form symbiotic associations with microbes, yet many of the underlying mechanisms associated with these interactions remain uncharacterized. There are inherent challenges to studying the cellular and metabolic interac…
Modeling and Analysis of Current-Carrying Coils Versus Rotating Magnet Transmitters for Low-Frequency Electrodynamic Wireless Power Transmission Open
Current-carrying coils and rotating permanent magnets can be used to create time-varying excitation magnetic fields for electrodynamic wireless power transmission (EWPT). Both types of transmitters produce low-frequency, time-varying field…
Challenges and Opportunities in D-Band Transmitter Architectures and Antenna Design, Integration, and Scalability for 6G Communications: A Brief Review Open
This article reviews the current state-of-the-art (SOTA) key enabling technologies that pave the way for the advancement of scalable 6G antenna array systems for future communications. The focus is on the development of transmitter buildin…
View article: Power handling in a highly-radiative negative triangularity pilot plant
Power handling in a highly-radiative negative triangularity pilot plant Open
This work explores detailed power handling solutions for a class of high-field, highly-radiative negative triangularity (NT) reactors based around the MANTA concept (Rutherford et al 2024 Plasma Phys. Control. Fusion ). The divertor design…
View article: MANTA: a negative-triangularity NASEM-compliant fusion pilot plant
MANTA: a negative-triangularity NASEM-compliant fusion pilot plant Open
The MANTA (Modular Adjustable Negative Triangularity ARC-class) design study investigated how negative-triangularity (NT) may be leveraged in a compact, fusion pilot plant (FPP) to take a ‘power-handling first’ approach. The result is a pu…
View article: Power handling in a highly-radiative negative triangularity pilot plant
Power handling in a highly-radiative negative triangularity pilot plant Open
This work explores power handling solutions for high-field, highly-radiative negative triangularity (NT) reactors based around the MANTA concept \cite{rutherford_manta_2024}. The divertor design is kept as simple as possible, opting for a …
View article: Broadband Electromagnetic Properties of Engineered Flexible Absorber Materials
Broadband Electromagnetic Properties of Engineered Flexible Absorber Materials Open
Flexible and stretchable materials have attracted significant interest in wearable electronics and bioengineering fields. Recent developments also incorporate embedded microwave circuits and systems with engineered flexible materials that …
View article: Quantifying stiffness and forces of tumor colonies and embryos using a magnetic microrobot
Quantifying stiffness and forces of tumor colonies and embryos using a magnetic microrobot Open
Stiffness and forces are two fundamental quantities essential to living cells and tissues. However, it has been a challenge to quantify both 3D traction forces and stiffness (or modulus) using the same probe in vivo. Here, we describe an a…
Overcoming the rise in local deposit resistance during electrophoretic deposition via suspension replenishing Open
Nanomaterials have unique properties, functionalities, and excellent performance, and as a result have gained significant interest across disciplines and industries. However, currently, there is a lack of techniques that can assemble as-sy…
View article: Fabrication and installation of the Mu2e cryogenic distribution system
Fabrication and installation of the Mu2e cryogenic distribution system Open
The muon-to-electron conversion (Mu2e) experiment at Fermilab will be used to search for the charged lepton flavor-violating conversion of muons to electrons in the field of an atomic nucleus. The Mu2e experiment is currently in the constr…
Hybrid Piezo/Magnetic Electromechanical Transformer Open
This paper presents a hybrid electromechanical transformer that passively transfers electrical power between galvanically isolated ports by coupling electrodynamic and piezoelectric transducers. The use of these two complementary electrome…
A Wirelessly Rechargeable AA Battery Using Electrodynamic Wireless Power Transmission Open
We report the design, fabrication, and characterization of a prototype that meets the form, fit, and function of a household 1.5 V AA battery, but which can be wirelessly recharged without removal from the host device. The prototype system…
Electrophoretic deposition of iron oxide nanoparticles to achieve thick nickel/iron oxide magnetic nanocomposite films Open
For modern switching power supplies, current bulk magnetic materials, such as ferrites or magnetic metal alloys, cannot provide both low loss and high magnetic saturation to function with both high power density and high efficiency at high…
A High-Throughput Microfluidic Magnetic Separation (µFMS) Platform for Water Quality Monitoring Open
The long-term aim of this work is to develop a biosensing system that rapidly detects bacterial targets of interest, such as Escherichia coli, in drinking and recreational water quality monitoring. For these applications, a standard sample…
Nanoscale structural evaluation of 0-3 magnetic nanocomposites fabricated by electro-infiltration Open
Magnetic nanocomposites with 0-3 connectivity, whereby a 0D magnetic nanoparticle phase is embedded into a 3D magnetic metal matrix phase, have gained increased interest for use in applications ranging from integrated power inductor cores …
Optimization of a Magnetodynamic Receiver for Versatile Low-Frequency Wireless Power Transfer Open
Magnetodynamic wireless power transfer (WPT), also known as electrodynamic wireless power transfer, is a low-frequency WPT technology based on an electromechanical receiver comprising a permanent magnet moving in a coil. Because of the low…
A simple passive 390 mV ac/dc rectifier for energy harvesting applications Open
This paper reports a simple, discrete, ac/dc rectifier architecture intended for magnetic energy harvesters that functions with ac input voltages as low as 390 mV pk . The proposed four NMOS rectifier (4NR) employs cross-connected, saturat…
Patterning of thick electroplated CoPt magnets using SU‐8 micromoulds Open
Recently, electroplated cobalt platinum (CoPt) magnetic films have been developed that afford thick (up to ∼100 μm), high‐energy‐density (up to ∼100 kJ/m 3 ) permanent‐magnet microstructures. However, the aggressive electroplating conditio…
Fully 3D-Printed, Monolithic, Mini Magnetic Actuators for Low-Cost, Compact Systems Open
We report the design, fabrication, and experimental characterization of the first fully 3D-printed, multi-material miniature magnetic actuators for compact systems in the literature. The actuator design integrates a bonded hard magnet made…
Experimental demonstration of multi-watt wireless power transmission to ferrite-core receivers at 6.78 MHz Open
This article experimentally explores the use of ferrite cores to miniaturize the receivers used for inductive wireless power transmission. A variety of receivers were designed and fabricated using cylindrical ferrite cores, ranging in tota…
Benchtop magnetic particle relaxometer for detection, characterization and analysis of magnetic nanoparticles Open
This paper presents the design, construction, and testing of a magnetic particle relaxometer (MPR) to assess magnetic nanoparticle response to dynamic magnetic fields while subjected to a bias field. The designed MPR can characterize magne…
Extending the range of wireless power transmission for bio-implants and wearables Open
This paper reports the latest achievements on an electrodynamic wireless power transmission (EWPT) system employing low-frequency (∼17 Hz), low-amplitude (< 1 mT) magnetic fields. Compared to inductively or resonantly coupled coils, the EW…
INCREASING THE THICKNESS AND DEPOSITION RATE OF HIGH-PERFORMANCE ELECTROPLATED CoPt PERMANENT MAGNETS Open
This paper reports the fabrication and magnetic characterization of very thick (50+ μm) and high-performing (coercivity up to 850 kA/m; energy products up to 75 kJ/m 3 ) electroplated permanent magnets microfabricated on silicon substrates…
MICROFABRICATED ELECTRODYNAMIC WIRELESS POWER RECEIVER FOR BIO-IMPLANTS AND WEARABLES Open
This paper reports the design, modeling, fabrication, and characterization of a microfabricated receiver as part of an electrodynamic wireless power transmission (EWPT) system.This system differs from inductively coupled wireless power tra…
BATCH-FABRICATION OF DIAMAGNETICALLY LEVITATED MICROROBOTS Open
This paper reports the batch fabrication of magnetically patterned bases for millimeter-scale, diamagnetically levitated microrobots.A selective-magnetization process is used to imprint checkerboard magnetic pole patterns in a single NdFeB…
The Cards Aren't Alright: Detecting Counterfeit Gift Cards Using Encoding Jitter Open
Gift cards are an increasingly popular payment platform. Much like credit cards, gift cards rely on a magnetic stripe to encode account information. Unlike credit cards, however, the EMV standard is entirely infeasible for gift cards due t…
A Compact Human-Powered Energy Harvesting System Open
A fully functional, self-sufficient body-worn energy harvesting system is presented in this paper.The system is designed for passively capturing energy from human motion, with the long-term vision of supplying power to portable, wearable, …