Ferrofluids belonging to the series, Ni x Fe1-x Fe2O4 and Zn x Fe1-x Fe2O4, were synthesized using cold co-precipitation. Liquid films of these ferrofluids were prepared by encapsulating the ferrofluids in between two optically smooth and ultrasonically cleaned glass plates. Magnetic field induced laser transmission through these ferrofluid films has been investigated. Magnetic field values can be calibrated in terms of output laser power in the low field region in which the variation is linear. This set up can be used as a cheap optical gaussmeter in the low field regime. Using the same set-up, the saturation magnetization of the sample used can also be calculated with a sample that is pre-characterized. Hence both magnetization of the sample, as well as applied magnetic field can be sensed and calculated with a precalibrated sample.
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机译：Ni x Fe 1-x Fe 2 O 4 和Zn x系列的铁磁流体采用冷共沉淀法合成了 Fe 1-x Fe 2 O 4 。这些铁磁流体的液膜是通过将铁磁流体封装在两个光学光滑和超声清洗过的玻璃板之间制成的。已经研究了磁场诱导的激光穿过这些铁磁流体薄膜的传输。磁场值可以根据在变化呈线性关系的低场区域中的输出激光功率进行校准。此设置可用作低场状态下的廉价光学高斯计。使用相同的设置，还可以使用预先表征的样品来计算所用样品的饱和磁化强度。因此，可以利用预校准的样品来感测和计算样品的磁化强度以及所施加的磁场。
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