Frictional force microscopic detection of frictional asymmetry and anisotropy at (10
4) surface of calcite
Abstract
Frictional asymmetry due to the tilt of 4) surface of
] direction. Observed asymmetry was in striking contrast with previous results for tilted S
O bonds of CaSO4(100), lower friction being observed when the probe was scanned against the tilt. The difference was explained by the tilt angles of C
O and S
O bonds, which are described as mass-spring systems, from surface normal. More tilted C
O bonds of
O bonds support the load by the reaction against compression of the springs. As was expected, the asymmetry signal was strongest along the [42
] direction, while no asymmetry was observed along the [010] direction. Compared to the case of CaSO4, the asymmetry signal at the