Local Magnetic Characterization of Continuous (Ga,Mn)As Film using Mechanical Force Detection

ORAL

Abstract

We report on low temperature (T = 4.2 K) studies of the local spin dynamics in ferromagnetic samples using Ferromagnetic Resonance Force Microscopy (FMRFM) and probe-induced Magnetic Force Microscopy (MFM). Both techniques are based on sensitive mechanical detection of the dipolar magnetic interaction between a micromagnetic probe mounted on a flexible micro-cantilever and magnetic moments in the sample. The probe magnet not only detects the magnetic force, but also perturbs sample spin magnetization by adding the strongly inhomogeneous magnetic field. We demonstrate that the combination of FMRFM and probe-induced MFM can be used to extract and map local magnetic properties of a continuous (Ga,Mn)As film such as saturation magnetization and anisotropy field. These new approaches to scanned magnetic force imaging open the door to powerful new tools for spatially resolved studies of nanoscale magnetism and spin-based devices.

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Authors

  • I. H. Lee

    The Ohio State University

  • Yu. Obukhov

    The Ohio State University

  • J. Kim

    The Ohio State University

  • X. Li

    The Pennsylvania State University, Materials Research Institute, Penn State University, University Park, Pennsylvania 16802, USA

  • Nitin Samarth

    Materials Research Institute, Penn State University., The Pennsylvania State University, Penn State University, Dept. of Physics, Penn State University, University Park PA 16802

  • Denis Pelekhov

    The Ohio State University

  • P. Chris Hammel

    The Ohio State University, Department of Physics, The Ohio State University, Ohio State University, Ohio State University department of Physics, Department of Physics, Ohio State University