NanoDay 2020 Poster 05 – Connor Smith

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Analysis of electro-infiltrated metal/iron-oxide nanocomposites for microinductor applications

Connor Smith(LinkedIn)

Authors: Connor Smith, Sara Mills, Shehaab Savliwala, Carlos Rinaldi, Jennifer Andrew, David Arnold

Faculty Mentor: David Arnold, PhD

College: College of Engineering

Department: Electrical and Computer Engineering


Completely magnetic nanocomposites with 0-3 connectivity, whereby a 0D magnetic nanoparticle phase is embedded in a 3D magnetic metal matrix phase, have gained increased interest for use in applications ranging from integrated power inductor cores to exchange-spring magnets. The electro-infiltration process, in which a metal is electroplated through a nanoparticle film, is an inexpensive approach compatible with semiconductor fabrication method for the formation of these nanocomposites. The resulting composites have proven to have magnetic properties that are a combination of the two material phases they are made-up of, but their high-frequency permeability and internal structures have not been highly explored, which is critical for understanding how they would perform in microinductor applications. In this research, two such magnetic nanocomposites are fabricated—one made of nickel and ~31 nm diameter iron-oxide nanoparticles, and the other made of permalloy and the same iron-oxide nanoparticles. These composites are then examined to determine the resulting effect on their magnetic properties, especially their high frequency permeability and losses. Further, the use of scanning/transmission electron microscopy (S/TEM) and energy dispersive x-ray spectroscopy (EDS) is performed to understand the internal structure of these composites.