Asymmetric magnetic NOT gate and shift registers for high density data storage

Zeng, Huang T.; Read, D.; O'Brien, L.; Sampaio, J.; Lewis, E. R.; Petit, D.; Cowburn, R. P.
June 2010
Applied Physics Letters;6/28/2010, Vol. 96 Issue 26, p262510
Academic Journal
We have developed an asymmetric ferromagnetic NOT gate and shift register optimized on a square grid. This gives rise to a two-dimensional storage scheme built up by tessellating an elementary data unit, which is scalable down to very narrow wire widths. The areal footprint of each storage unit is 15F2, where F is the minimum feature size. We experimentally demonstrate NOT operations across a chain of three gates made from Permalloy with F=60 nm, and present a functional 15-gate, multichannel shift register with electrical injection, and optical readout.


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