Dresden 2009 – scientific programme
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MA: Fachverband Magnetismus
MA 10: Magnetic Imaging
MA 10.1: Talk
Monday, March 23, 2009, 17:15–17:30, HSZ 403
HF-MFM on perpendicular write heads — •R. Pfeifer1, M.R. Koblischka1, B.F. Valcu2, and U. Hartmann1 — 1Experimental Physics, Saarland University, P.O.Box 151150, D-66041 Saarbrücken — 2Seagate Technology, Fremont, CA
The HF-MFM (High Frequency Magnetic Force Microscopy) techique has been employed for the measurement of stray fields emanating from traditional longitudinal write heads [1],[2]. Here we show that it is also possible to apply the HF-MFM technique to perpendicular write heads [3]. The situation is different in so far, that there is no magnetic flux between two poles. In contrast there is only one pole and the flux closure is obtained in combiation with the writing medium. An ac current of 50 mA with a carrier frequency of 2 GHz fed in into the write head, causes an observable contrast in the HF-MFM image. Not only the write pole itself but also the magnetic shieldings around the pole are strongly influenced by the HF-current.
[1]Li S, Stokes S, Liu Y, Foss-Schrader S, Zhu W und Palmer D, J. Appl. Phys. 91 7346 (2002) [2]Koblischka M R, et al., IEEE Trans. Magn. 43 2205 (2007) [3]Valcu B F, Allimi B, Dobnin A, Lynch R, Brockie R, Intermag 2008