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Journal of Nanomaterials
Volume 2012 (2012), Article ID 186138, 6 pages
http://dx.doi.org/10.1155/2012/186138
Research Article

Effect of Low-Frequency Alternative-Current Magnetic Susceptibility in Ni80Fe20 Thin Films

Department of Materials Science and Engineering, I-Shou University, Kaohsiung 840, Taiwan

Received 7 January 2012; Revised 6 February 2012; Accepted 6 February 2012

Academic Editor: Zhi Li Xiao

Copyright © 2012 Yuan-Tsung Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

X-ray diffraction (XRD) results indicate that the NiFe thin films had a face-centered cubic (FCC) structure. Post-annealing treatment increased the crystallinity of NiFe films over those at room temperature (RT), suggesting that NiFe crystallization yields FCC (111) texturing. Post-annealing treatments increase crystallinity over that obtained at RT. This paper focuses on the maximum alternative-current magnetic susceptibility (??ac) value of NiFe thin films with resonance frequency (??res) at low frequencies from 10?Hz to 25000?Hz. These results demonstrate that the ??ac of NiFe thin films increased with post-annealing treatment and increasing thickness. The NiFe (111) texture suggests that the relationship between magneto-crystalline anisotropy and the maximum ??ac value with optimal resonance frequency (??res) increased spin sensitivity at optimal ??res. The results obtained under the three conditions revealed that the maximum ??ac value and optimal ??res of a 1000?Å-thick NiFe thin film are 3.45?Hz and 500?Hz, respectively, following postannealing at ??A=250°C for 1?h. This suggests that a 1000?Å NiFe thin film post-annealed at ??A=250°C is suitable for gauge sensor and transformer applications at low frequencies.