Ferrofluid thin films as optical gaussmeters proposed for field and magnetic moment sensing

Bulletin of materials science

Swapna S Nair¹  S Rajesh³  V S Abraham²  M R Anantharaman¹ 

[1] Department of Physics, Cochin University of Science and Technology, Cochin 682 022, India$$Department of Physics, Cochin University of Science and Technology, Cochin 682 022, IndiaDepartment of Physics, Cochin University of Science and Technology, Cochin 682 022, India$$;School of Engineering and Sciences, International University of Bremen, 28759, Bremen, Germany$$School of Engineering and Sciences, International University of Bremen, 28759, Bremen, GermanySchool of Engineering and Sciences, International University of Bremen, 28759, Bremen, Germany$$;Biophysics and Microscopy Group, Molecular Cytology, University of Amsterdam, 1090 GB Amsterdam, The Netherlands$$Biophysics and Microscopy Group, Molecular Cytology, University of Amsterdam, 1090 GB Amsterdam, The NetherlandsBiophysics and Microscopy Group, Molecular Cytology, University of Amsterdam, 1090 GB Amsterdam, The Netherlands$$

关键词: Ferrofluids;    optical gaussmeter;    ferrites;    magneto-optics;    laser transmission.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Ferrofluids belonging to the series, Ni_ð‘�?Fe_{1−ð�?��?}Fe₂O₄ and Zn_ð‘�?Fe_{1−ð�?��?}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.

【 授权许可】

Unknown