Publications by authors named "Michael J Donahue"
Strongly Interacting Nanoferrites for Magnetic Particle Imaging and Spatially Resolved Thermometry.
ACS Appl Mater Interfaces
October 2024
Article Synopsis
- High-crystal-quality nanoferrites with short ligands, like oleic acid, have been found to improve sensitivity and spatial resolution in magnetic particle imaging (MPI) due to their ability to form uniaxial assemblies.
- A one-pot thermal decomposition method was developed to create magnetic nano-objects (MNOs) that show strong magnetic interactions and reproducibility, with sizes ranging from 12 to 27 nm, affecting their response and chain formation capabilities.
- The study revealed that these ferrite MNOs significantly enhance signal and spatial resolution compared to existing MPI tracers, with results indicating the importance of optimizing the frequency and field amplitude for effective imaging and thermal performance.
A Low-loss and Lightweight Magnetic Material for Electrical Machinery.
IET Electr Power Appl
January 2020
A low-loss and lightweight core material, with applications in electrical machinery, is made of highly packed and insulated magnetic microwires (MWs). These MWs are aligned in such a way as to guide the flux in the rotor/stator, with the ultimate goal of increasing efficiency and substantially reducing core losses. Commercial FeNiCo-based MWs with a 127 m diameter and a 33 m insulation coating are utilized.
View Article and Find Full Text PDFA micromagnetic solver using the Finite Difference method on a Graphics Processing Unit (GPU) and its integration with the Object Oriented MicroMagnetic Framework (OOMMF) are presented. Two approaches for computing the magnetostatic field accelerated by the Fast Fourier Transform (FFT) are implemented. The first approach, referred to as the tensor approach, is based on the tensor spatial convolution to directly compute the magnetostatic field from magnetic moments.
View Article and Find Full Text PDFPurpose: Quinacrine is a relatively non-toxic drug, once given almost exclusively for malaria. However, recent studies show that quinacrine can suppress nuclear factor-κB (NF-κB), and activate p53 signaling. We investigated the anti-cancer effect of quinacrine, using a novel mouse model of isolated limb perfusion (ILP) for extremity melanoma.
View Article and Find Full Text PDFExperimental measurements of domain wall propagation are typically interpreted by comparison to reduced models that ignore both the effects of disorder and the internal dynamics of the domain wall structure. Using micromagnetic simulations, we study vortex wall propagation in magnetic nanowires induced by fields or currents in the presence of disorder. We show that the disorder leads to increases and decreases in the domain wall velocity depending on the conditions.
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