• Sailer, Robert
• Jeppson, Pamela J.
• Jarabek, Eric L.
• Sandstrom, Joseph A.
• Al-Badri, Zoha
• Grier, Dean G.
• Tondra, Mark
• Schulz, Douglas L.
• Boudjouk, Philip R.
• Eames, Pete
• Caruso, Anthony

Abstract

<jats:title>Abstract</jats:title><jats:p>Electromagnetic shields and flux concentrators for magnetic sensors could utilize flexible and insulating composites applied using simple thin film deposition methods such as dip-coating, spin-coating, spraying, etc. As the first step towards development of composites with superior performance, efforts focused on isolating nanoparticles with large magnetizations under low fields. In this paper, we provide the results of proof-of-concept studies for two systems: metal-functionalized silicone-based materials (metal-silicone); and, Co-ferrite (Co<jats:sup>2+</jats:sup><jats:sub>1−x</jats:sub>Fe<jats:sup>2+</jats:sup><jats:sub>x</jats:sub>Fe<jats:sup>3+</jats:sup><jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>) nanoparticles. The metal-silicone materials studied included a polysiloxane that contained a pendant ferrocene where an optimum saturization magnetization of 5.9 emu/g (coercivity = 11 Oe) was observed. Co-ferrite nanoparticle samples prepared in this study showed unprecendented saturation magnetization (i.e., M<jats:sub>s</jats:sub> &gt; 150 emu/g) with low coercivity (H<jats:sub>c</jats:sub> ∼ 10 Oe) at room temperature and offer potential application as flux concentrators.</jats:p>

Topics

• nanoparticle
• Deposition
• thin film
• composite
• permeability
• magnetization
• saturation magnetization
• coercivity