Dynamic magnetomechanical behavior of Terfenol-D/epoxy 1-3 particulate composites

被引:65
作者
Or, SW [1 ]
Nersessian, N
Carman, GP
机构
[1] Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R China
[2] Univ Calif Los Angeles, Dept Mech & Aerosp Engn, Los Angeles, CA 90095 USA
基金
美国国家科学基金会;
关键词
domain-wall motion; dynamic magnetornechanical properties; eddy-current losses; magnetization process; 1-3 magnetostrictive particulate composite; Terfenol-D; transducers;
D O I
10.1109/TMAG.2003.821123
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We investigated the dynamic behavior of 1-3 type magnetostrictive particulate composites as a function of both bias field (5-140 kA/m) and frequency (1-100 kHz). The composites consist of approximately 0.5 volume-fraction Terfenol-D particles embedded and magnetically aligned in a passive epoxy matrix. The measured properties include elastic moduli (E-3(H) and E-3(B)), dynamic relative permeability (mu(r33)), dynamic strain coefficient (d(33)), magnetomechanical coupling coefficient (k(33)), and the ratio of the dynamic strain coefficient to the dynamic susceptibility (d(33)/chi(33)). We observed the dependence of these properties on bias field and explain it here in terms of domain-wall motion followed by saturation near 40 kA/m. The spectra of mu(r33), d(33), and d(33)/chi(33) indicate that the magnetization process is independent of frequency and that the effect of eddy-current losses is insignificant up to 100 kHz. The observations agree with predictions made by classical eddy-current theory and suggest that the composites can be operated at significantly higher frequencies than monolithic Terfenol-D.
引用
收藏
页码:71 / 77
页数:7
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