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Solenoid-Type Thin-Film Micro-Transformer

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4 Author(s)
Kurata, H. ; Amorphous Magnetic Device Laboratory ; Shirakawa, K. ; Nakazima, O. ; Murakami, K.

In order to miniaturize magnetic devices, the operating frequency must be raised. We have studied thin-film microin-ductors with the aim of achieving a high operating frequency and reduced iron loss. In this paper, we propose a thin-film microtransformer with a high operating frequency, achieved by use of a multilayered magnetic film as the core. The magnetic core was made of amorphous CoFeSiB mono-layer film or CoFeSiB/SiO2 multilayered film. The induced magnetic anisotropy was controlled such that the coil exciting direction is along the hard axis. The total thickness of the magnetic layer was 3 ¿m, and the size of the core was 0.6×2.3 mm. The experimental transformers revealed that a multilayered core is useful for improving the transmission loss of transformers at high operating frequencies. A thin-film transformer was developed with a transmission loss of 2.7 dB between 100 MHz and 250 MHz, a value smaller than the 5.3 dB loss of a mono-layer-core device.

Published in:

Magnetics in Japan, IEEE Translation Journal on  (Volume:9 ,  Issue: 3 )