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Micromagnetic Simulation of CNT-MFM Probes under Magnetic Field
Takashi Manago,Hironori Asada,Hiromi Kuramochi 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
On the ferromagnetic-film-coated carbon nanotube for a magnetic force microscope (CNT-MFM)probe, the stability of the magnetic structure in an external magnetic field was investigated usinga three-dimensional micromagnetic simulation. When a magnetic field was applied along the longitudinaldirection, in the direction opposite that of the magnetization of the probe, the directionof the magnetic moments of the probe remained the same up to –200 mT and then reversed all atonce. When a magnetic field was applied along horizontal direction, the direction of the magneticmoments gradually tilts with increasing field. MFM observations seem to be possible for magneticfields up to 100 150 mT, judging from the magnetic structure of the probe. In contrast, themagnetic structures of pyramidal probes show vortex-like magnetic structure and low tolerance toan external magnetic field. The CNT-MFM probe is relatively robust under an external magneticfield due to the strong shape anisotropy attributed to its cylindrical shape.