Department of Physics, Public University of Navarre, Pamplona, Spain.
Nanotechnology. 2010 Mar 5;21(9):095702. doi: 10.1088/0957-4484/21/9/095702. Epub 2010 Feb 3.
Si micro-cantilevers were coated with Co nano-strings, which were simultaneously grown and sculpted during off-normal pulsed laser deposition. The surface morphology of micro-cantilevers with longitudinal or transverse nano-strings was analysed by scanning tunnelling microscopy. Magnetic anisotropy was detected with a magnetization direction parallel to the nano-strings. The two micro-cantilever types exhibited different mechanical behaviours when placed in a non-uniform magnetic field. By varying the relative position of the micro-cantilever with respect to the gradient direction of this field, a split in the resonant frequency shift of the micro-cantilevers was generated, depending on the direction of magnetic anisotropy. Discrimination was achieved between the micro-cantilevers with transverse nano-strings and the micro-cantilevers with longitudinal nano-strings. The lowest limit of magnetic moment for distinction between these covered micro-cantilevers was 10(-8) emu. The possible benefits of these magneto-mechanical properties for the biological, chemical and physical applications of some nano-mechanical devices are pointed out.
如果微悬臂梁被 Co 纳米线覆盖，并且在非正常脉冲激光沉积过程中同时生长和雕刻纳米线。通过扫描隧道显微镜分析具有纵向或横向纳米线的微悬臂梁的表面形态。通过将磁化方向与纳米线平行来检测磁各向异性。当将这两种微悬臂梁类型置于非均匀磁场中时，它们表现出不同的机械行为。通过改变微悬臂梁相对于该磁场梯度方向的相对位置，根据磁各向异性的方向，微悬臂梁的共振频率位移发生分裂。可以在具有横向纳米线的微悬臂梁和具有纵向纳米线的微悬臂梁之间进行区分。区分这些覆盖的微悬臂梁的最低磁矩极限为 10(-8)emu。指出了这些磁机械性能对某些纳米机械器件在生物、化学和物理应用中的潜在益处。
