• Dupré, Luc
• Van Waeyenberge, Bartel
• Van De Wiele, Ben
• Vandermeulen, Jasper

Abstract

We introduce a non-volatile digital logic and memory concept in which the binary data is stored in the transverse magnetic domain walls rather than the magnetic domains present in in-plane magnetized nanowires with sufficiently small cross sectional dimensions. We assign the digital bit to the two possible orientations of the transverse domain wall. Numerical proofs-of-concept designs are presented for a NOT-, AND- and OR-gate, a FAN-out as well as a reading and writing device. For some concepts, the functionality is achieved over a wide range of variable design parameters, numerically demonstrating robustness. Contrary to the chirality based vortex domain wall logic gates introduced in Phys. Rev. Appl. 2 (2014), the presented concepts remain applicable when miniaturized.Moreover, they are electrical current driven, making the technology compatible with the racetrack memory concept. The individual devices can be easily combined to form logic networks with clock speeds that scale linearly with decreasing design dimensions, starting from envisaged clock speeds of about 66 MHz for the sub-optimal designs presented. This opens opportunities to an all-magnetic computing technology where the digital data is stored and processed under the same magnetic representation.

Topics

• impedance spectroscopy
• magnetic domain wall