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arXiv 0810.2770cond-mat.mtrl-scicond-mat.other
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混合钆钇铁石榴石的磁化率和磁化涨落测量

Magnetic susceptibility and magnetization fluctuation measurements of mixed Gadolinium-Yttrium Iron Garnets

S. Eckel, A. O. Sushkov, S. K. Lamoreaux

摘要:

研究了钆钇铁石榴石($\text{Gd}_{x}\text{Y}_{3-x}\text{Fe}_5\text{0}_{12}$,$x=3,1.8$)铁氧体陶瓷的磁性能。复初始磁导率是在2 K至295 K的温度范围内以1 kHz的频率测量的,以及在4 K、77 K和295 K的温度范围内以100 Hz至200 MHz的频率测量的。在低频率下观察到磁粘度引起的磁导率虚部。在4K下测量了磁化噪声.使用波动耗散定理,我们发现,所观察到的磁化波动是一致的,与我们的测量的低频虚部的磁导率。我们讨论了一些建议的精度测量以及其他可能的应用程序的影响。

英文摘要:

We study the magnetic properties of Gadolinium-Yttrium Iron Garnet ($\text{Gd}_{x}\text{Y}_{3-x}\text{Fe}_5\text{0}_{12}$, $x=3,1.8$) ferrite ceramics. The complex initial permeability is measured in the temperature range 2 K to 295 K at frequency of 1 kHz, and in the frequency range 100 Hz to 200 MHz at temperatures 4 K, 77 K, and 295 K. The magnetic viscosity-induced imaginary part of the permeability is observed at low frequencies. Measurements of the magnetization noise are made at 4 K. Using the fluctuation-dissipation theorem, we find that the observed magnetization fluctuations are consistent with our measurements of the low-frequency imaginary part of permeability. We discuss some implications for proposed precision measurements as well as other possible applications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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