Permeability measurement on ferromagnetic thin films from 50 MHz up to 18 GHz
Permeability measurement on ferromagnetic thin films from 50 MHz up to 18 GHz
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DOI：
10.1016/0304-8853(94)00323-8
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发表时间：
1994-09
影响因子：
2.7
通讯作者：
O. Acher;J. Vermeulen;P. Jacquart;J. Fontaine;P. Baclet
中科院分区：
文献类型：
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作者：
O. Acher;J. Vermeulen;P. Jacquart;J. Fontaine;P. Baclet
宽带记录系统的发展推动了对铁磁材料高频磁导率测量的需求。然而，在500 MHz以上的铁磁薄膜的测量是困难的。宽带磁导率测量报告只有几个GHz。在更高的频率可以使用谐振腔进行测量，因为它是在铁磁共振，但只有在离散frequency.In相比之下，我们提出了一种技术，用于测量铁磁薄膜的高频磁导率在一个很宽的频带。它的工作频率范围（50 MHz至18 GHz或更高）允许直接观察非饱和样品的旋磁共振，并且可以产生各向异性薄膜在不同方向上的磁导率。在我们的技术中，必须缠绕约0.5 dm2的铁磁材料表面以获得适当的样品几何形状。因此，我们的技术仅限于沉积在薄的柔性基板上的涂层和通过快速凝固产生的薄的自支撑带。与另一种测量技术工作到3 GHz的比较，并与计算的旋磁响应，产生令人满意的协议。我们的方法的局限性进行了讨论。光谱磁导率测量报告几种合金。
The needs for permeability measurements on ferromagnetic materials at high frequencies are driven by the development of broad-band recording systems. However, measurements above 500 MHz on ferromagnetic films are difficult. Wide band permeability measurements are reported only up to a few GHz. Measurements at higher frequencies can be performed using resonant cavities, as it is done in ferromagnetic resonance, but only at discrete frequencies.In contrast, we present a technique for measuring high frequency permeability of ferromagnetic films over a wide band. It works in a frequency range (50 MHz to 18 GHz or higher) that allows direct observation of the gyromagnetic resonance even on non-saturated samples, and can yield permeability in different directions for anisotropic films. In our technique a surface of about 0.5 dm2of the ferromagnetic material has to be wound to obtain proper sample geometry. As a consequence, our technique is restricted to coatings deposited on thin flexible substrates and to thin self supported ribbons produced by rapid solidification. Comparison with another measurement technique working up to 3 GHz, and with calculated gyromagnetic response, yield a satisfactory agreement. The limitations of our method are discussed. Spectroscopic permeability measurements are reported for several alloys.