Author/Authors :
Wolny، نويسنده , , F. and Obukhov، نويسنده , , Y. and Mühl، نويسنده , , T. and Weiكker، نويسنده , , U. and Philippi، نويسنده , , S. and Leonhardt، نويسنده , , A. and Banerjee، نويسنده , , P. and Reed، نويسنده , , A. and Xiang، نويسنده , , G. and Adur، نويسنده , , R. and Lee، نويسنده , , I. and Hauser، نويسنده , , A.J. and Yang، نويسنده , , F.Y. and Pelekhov، نويسنده , , D.V. and Büchner، نويسنده , , B. and Hammel، نويسنده , , P.C.، نويسنده ,
Abstract :
An iron filled carbon nanotube (FeCNT), a 10–40 nm ferromagnetic nanowire enclosed in a protective carbon tube, is an attractive candidate for a magnetic force microscopy (MFM) probe as it provides a mechanically and chemically robust, nanoscale probe. We demonstrate the probeʹs capabilities with images of the magnetic field gradients close to the surface of a Py dot in both the multi-domain and vortex states. We show the FeCNT probe is accurately described by a single magnetic monopole located at its tip. Its effective magnetic charge is determined by the diameter of the iron wire and its saturation magnetization 4 π M s ≈ 2.2 × 10 4 G . A magnetic monopole probe is advantageous as it enables quantitative measurements of the magnetic field gradient close to the sample surface. The lateral resolution is defined by the diameter of the iron wire and the probe-sample separation.
