Note: Vector network analyzer-ferromagnetic resonance spectrometer using high Q-factor cavity

C. K. Lo, W. C. Lai, J. C. Cheng

研究成果: 雜誌貢獻文章

1 引文 斯高帕斯(Scopus)

摘要

A ferromagnetic resonance (FMR) spectrometer whose main components consist of an X-band resonator and a vector network analyzer (VNA) was developed. This spectrometer takes advantage of a high Q-factor (9600) cavity and state-of-the-art VNA. Accordingly, field modulation lock-in technique for signal to noise ratio (SNR) enhancement is no longer necessary, and FMR absorption can therefore be extracted directly. Its derivative for the ascertainment of full width at half maximum height of FMR peak can be found by taking the differentiation of original data. This system was characterized with different thicknesses of permalloy (Py) films and its multilayer, and found that the SNR of 5 nm Py on glass was better than 50, and did not have significant reduction even at low microwave excitation power (-20 dBm), and at low Q-factor (3000). The FMR other than X-band can also be examined in the same manner by using a suitable band cavity within the frequency range of VNA.

原文英語
文章編號086114
期刊Review of Scientific Instruments
82
發行號8
DOIs
出版狀態已發佈 - 2011 八月 1

ASJC Scopus subject areas

  • Instrumentation

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