2017 年 137 巻 8 号 p. 245-246
A Si cantilever with a magnet particle is packaged in vacuum by a direct metal (Al) bonding at 370°C. The surface of Al metal layers is coated by a thin tin (Sn) layer subsequently as an anti-oxidation layer. The packaged pressure of ∼150 Pa is estimated by the Q factors of the packaged cantilever. The bonding process with a passivation layer is a good candidate for a vacuum packaging. By packaging in high vacuum, the cantilever with a magnet particle is useful to measure the magnetic forces under ambient atmosphere.
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