Dynamics of Magnetic Nanoparticles and Nanodevices

Published

May 31, 2015

Author(s)

Stephen E. Russek, Eric R. Evarts, Robert J. Usselman

Abstract

Nanoscale magnetic devices and particles are being developed for a wide variety of applications including magnetic memory, nanoscale sensors, magnetic resonance imaging (MRI) agents, and therapeutic agents. Magnetic nanoparticles are also endogenous to the human body in the form of ferritin. The small volume and anisotropy energies of these structures make their magnetic moments very susceptible to thermal fluctuations. The magnetization dynamics of these structures occur on a wide range of time scales from thermally activated Arrhenius behavior that may cause an unwanted moment reversal of a magnetic random access memory bit once in ten years to the 100 GHz precessional resonance of a magnetic nanoparticle in a clinical MRI system. Here we review the stochastic dynamics of magnetic nanoparticles and devices for both single particles and for ensembles. We focus on particles whose dimensions are on the order of 1 nm to 100 nm and have moments on the order of 10 to 100,000 B.

Citation

Handbook of Nanomagnetism: Applications and Tools

Publisher Info

Pan Stanford Publishing Pte. Ltd., Boca Raton, FL

Pub Type

Book Chapters

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DOI Link

Keywords

Magnetic devices, magnetic random access memory, magnetic nanoparticles, stochastic LLG

Citation

Russek, S. , Evarts, E. and Usselman, R. (2015), Dynamics of Magnetic Nanoparticles and Nanodevices, Handbook of Nanomagnetism: Applications and Tools, Pan Stanford Publishing Pte. Ltd., Boca Raton, FL, [online], https://doi.org/10.1201/b18942-7 (Accessed September 10, 2024)