Surface Magnetostriction Model for MagNEMS

Abstract

In this work the inuence of surface roughness on magnetostrictive nano-actuator parameters has been analyzed theoretically. A mechanical and magnetoelastic behavior of investigated cantilever bimorphic system has been described in the frame of the simple analytical model. Realistic material parameters have been incorporated into the model for high-magnetostrictive galfenol (Fe-Ga) thin lms on silicon substrate. It has been shown that for 5 nm thick galfenol lm a at surface magnetostrictive eects modify the cantilever deection and force only by 3%, whereas in the case of rough surface this inuence increases to about 15%, when dimensions of roughness steps are comparable to the distances between them.

Interface influence on the properties of Co 90 Fe 10 films on soft magnetic underlayers – Magnetostrictive and Mössbauer spectrometry studies

“…Thus it means that a new phase is formed between Co 90 Fe 10 and Ni 81 Fe 19 layers and it can be qualified as interface region. The strong influence of the surface effects, roughness and interfaces on the effective magnetostriction of thin films and MagMEMS devices is well known feature both from experimental and theoretical point of view [34]. Thus the correlation between the saturation magnetostriction constant of the all samples and mean hyperfine field of Co 90 Fe 10 layers together with interface regions were studied.…”

Remote Magnetomechanical Nanoactuation

“…These are made by Si nanocantilevers coated with a thin layer of Galfenol (the material with the highest magnetostrictive coefficient). Although, predictions, based on theoretical modeling and considering experimental material parameters reported in the literature, are that the total deflections achievable for a cantilever 1 μm long and 100 nm wide would be only a fraction of nanometer . In addition, the unavoidable presence of surface roughness is expected to affect dramatically the magnetostriction effect, namely the reproducibility of the nanocantilever performances.…”