Quantitative magnetic force microscopy on permalloy dots using an iron filled carbon nanotube probe
| Autor: | Wolny, F., Obukhov, Y., Mühl, T., Weissker, U., Philippi, S., Leonhardt, A., Banerjee, P., Reed, A., Xiang, G., Adur, R., Lee, I., Hauser, A. J., Yang, F. Y., Pelekhov, D. V., Büchner, B., Hammel, P. C. |
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| Rok vydání: | 2010 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | We have characterized a new Magnetic Force Microscopy (MFM) probe based on an iron filled carbon nanotube (FeCNT) using MFM imaging on permalloy (Py) disks saturated in a high magnetic field perpendicular to the disk plane. The experimental data are accurately modeled by describing the FeCNT probe as having a single magnetic monopole at its tip whose effective magnetic charge is determined by the diameter of the iron wire enclosed in the carbon nanotube and its saturation magnetization 4 \pi M_s ~ 2.2 x 10^4 G. A magnetic monopole probe 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 ~15 nm and the probe-sample separation. As a demonstration, the magnetic field gradients close to the surface of a Py dot in domain and vortex states were imaged. Comment: 6 pages, 7 figures |
| Databáze: | arXiv |
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