Journal
SENSORS
Volume 10, Issue 9, Pages 8161-8172Publisher
MDPI
DOI: 10.3390/s100908161
Keywords
MEMS transformer; ferrofluid
Funding
- National Science Council in Taiwan [NSC 96-2628-E-002-194-MY3, NSC 98-3114-E-002-002-CC2]
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An on-chip transformer with a ferrofluid magnetic core has been developed and tested. The transformer consists of solenoid-type coil and a magnetic core of ferrofluid, with the former fabricated by MEMS technology and the latter by a chemical co-precipitation method. The performance of the MEMS transformer with a ferrofluid magnetic core was measured and simulated with frequencies ranging from 100 kHz to 100 MHz. Experimental results reveal that the presence of the ferrofluid increases the inductance of coils and the coupling coefficient of transformer; however, it also increases the resistance owing to the lag between the external magnetic field and the magnetization of the material.
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