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G. Winkler, D. Süss, J. Lee, J. Fidler, M. A. Bashir, J. Dean, A. Goncharov, G. Hrkac, S. Bance, T. Schrefl:
"Microwave-assisted three-dimensional multilayer magnetic recording";
Applied Physics Letters, 94 (2009), S. 232501-1 - 232501-3.

Layer-selective writing of two layer bit patterned media is demonstrated by performing micromagnetic finite element simulations. Selectivity is achieved by controlling the frequency of an oscillating magnetic field in the gigahertz range, applied in addition to the head field. Generation of the microwave field by means of a wire next to the tip of a single pole head is proposed. The Oersted field from the alternating current induces magnetic oscillations in the pole tip which create a high frequency field that is superimposed to the perpendicular write field. The amplitude of the ac field component is in the order of 0.1 T.

http://dx.doi.org/10.1063/1.3152293

http://link.aip.org/link/?APPLAB/94/232501/1