Theoretical and Experimental Study of Synthetic MFM Tips
Y.H. Wu, G. Han and Y.K. Zheng
National University of Singapore, SG
MFM tips, synthetic structure, point-dipole response
Recently, we have developed a synthetic MFM tip consisting of two ferromagnetic layers and a non-magnetic spacer . The two ferromagnetic layers are coupled antiferromagnetically so that the MFM works in a differential detection mode. This has led to the enhancement of high-frequency component against the lower frequency counterpart. Experimentally we have also found that the synthetic tip functions as a point-dipole tip. In this paper, we will present a detailed theoretical analysis of the tip and compare the results with experimental data. The effect of spacer thickness on the imaging characteristics of the MFM tip will also be discussed.  Y. H. Wu et al, Appl. Phys. Lett. 82, 1748-1750 (2003).
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Nanotech 2005 Conference Program Abstract