A magnetometer for determining the magnetization of magnetic functional dispersed nanofluids.

The research goal is to create a simple, portable and accurate magnetometric device to measure the magnetization of magnetic functional dispersed materials in relatively high magnetic fields. The device uses the magnetometric method with Hall induction transducers. Prismatic magnets made of SmCo5 alloy create a uniform magnetizing field of up to 4.105 A/m in the nanofluid cuvette area. Two Hall transducers based on n-InSb-i-GaAs heteroepitaxial films measure the magnetizing magnetic field intensity and the magnetic field induction in the test substance. The additive and multiplicative components of the magnetometer instrumental errors are insignificant. The main reason of the device methodological error is the difference between the magnetic field induction measured in the magnetic circuit cavity and the magnetic field induction in the neutral section; the difference between the magnetic field strength at the sample surface and the field value in the transducer active zone. There is a correction factor to level out the methodological error. The device design allows measuring magnetic nanofluids magnetization in the range from 10 kA/m to 50 kA/m with an error of about 1.5%. The magnetometer can help to track the technological regulations of producing magnetic nanofluids and control their properties. [ABSTRACT FROM AUTHOR]