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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Magnetoimpedance, ferromagnetic resonance, and low field microwave absorption in amorphous ferromagnets
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Magnetoimpedance, ferromagnetic resonance, and low field microwave absorption in amorphous ferromagnets

机译：非晶铁磁体中的磁阻，铁磁共振和低场微波吸收

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摘要

For many applications, the efficiency of giant magnetoimpedance (GMI) increases as the working frequency increases; the natural limit seems to be ferromagnetic resonance (FMR). However, MI is an essentially different phenomenon than FMR. The latter is a quantum-mechanical phenomenon which should satisfy the Larmor equation, while MI extends continuously from some hundreds of kHz up to the GHz range. A new phenomenon, which appears at very low fields in FMR experiments (by means of measurements around zero field that need a special accessory to compensate the remanence of electromagnets, and accurately measure very low magnetic fields) led to a clear difference between MI and FMR. This microwave interaction, which we call 'low field absorption' (LFA), has shown a strong similarity with MI, as far as it is also controlled by the anisotropy field. In this work, we show the start of the splitting between MI and FMR at frequencies similar to 200 MHz, and the full differentiation between LFA and FMR at 9.4 GHz. We analyze the basic features of LFA and the conditions to be properly compared with GMI. Finally, we present some studies on selected materials. (c) 2007 Elsevier B.V. All rights reserved.
机译：在许多应用中，巨磁阻（GMI）的效率随着工作频率的增加而增加;自然的限制似乎是铁磁共振（FMR）。但是，MI与FMR本质上是不同的现象。后者是应满足拉莫尔方程的量子力学现象，而MI则从数百kHz一直延伸到GHz范围。在FMR实验的极低磁场中出现了一种新现象（通过零磁场附近的测量，该测量需要一个特殊的附件来补偿电磁体的剩磁，并精确地测量极低的磁场），导致MI和FMR明显不同。这种微波相互作用，我们称为“低场吸收”（LFA），与MI表现出很强的相似性，只要它也受各向异性场控制。在这项工作中，我们显示了在类似于200 MHz的频率下MI与FMR之间分裂的开始，以及在9.4 GHz频率下LFA与FMR之间的完全区别。我们分析了LFA的基本特征以及与GMI进行适当比较的条件。最后，我们介绍一些有关所选材料的研究。 （c）2007 Elsevier B.V.保留所有权利。

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