title: Magnetic field detection for current evaluation by magnetic force microscopy.
abstract: A current measurement method through magnetic field detection by magnetic force microscopy was proposed and demonstrated. We observed the magnetic field induced by an AC below 2.2 microA around a GaAs/AlGaAs mesa stripe. To achieve high sensitivity in magnetic field detection, we tuned the AC bias frequency to the torsional resonant frequency of the cantilever. As a result, the sensitivity of the magnetic field detection was much improved and specific features of the magnetic field around the mesa stripe were clearly observed at a current in sub-microA range.
authors.affiliation: Institute of Industrial Science (IIS), University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan. takuji@iis.u-tokyo.ac.jp
authors.forename: Takuji
authors.initials: T
authors.lastname: Takahashi
authors.forename: Daisuke
authors.initials: D
authors.lastname: Saida