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Synergistic Inclusion Effects of Hard Magnetic Nanorods on the Magnetomechanical Actuation of Soft Magnetic Microsphere‐Based Polymer Composites by Jeong Eun Park; Seung Hyuk Kwon; Qi Lu; Hyoung Jin Choi; Jeong Jae Wie is a Engineering article available to read on EtoBox.

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## Abstract The magnetomechanical actuation of micropillars is developed for the contactless manipulation of miniaturized actuators and microtextured surfaces. Anisotropic geometry of micropillars can significantly enhance the magnetic actuation compared with their isotropic counterparts by directional stress distributions. However, this strategy is not viable for triangular micropillars owing to insufficient anisotropy. In this study, a significant improvement in the magnetic actuation of triangular micropillars using composite magnetic particles is reported. A minute and optimal amount of hard magnetic gamma‐ferrite nanorods are hybridized with soft magnetic iron microspheres to generate synergistic effects of magnetic coupling and percolation phenomenon on the magnetic actuation of polymer composites. The addition of 1 wt% face‐centered cubic‐phased gamma‐ferrite nanorods suppresses the magnetic coupling interference of body‐centered cubic‐phased iron microspheres. Furthermore, the nanorods reduce the percolation threshold by participating in the percolation of the microspheres. A systematic compositional study on the magnetization and magnetorheological properties reveals that

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Author

Jeong Eun Park; Seung Hyuk Kwon; Qi Lu; Hyoung Jin Choi; Jeong Jae Wie

Publisher

Wiley

Published

2023

Language

EN

Field

Engineering (Physical Sciences)