Spintronic computing promises superior energy efficiency and nonvolatility compared to conventional field-effect transistor logic. But, it has proven difficult to realize spintronic circuits with a versatile, scalable device design that is adaptable to emerging material physics. Here we present prototypes of a logic device that encode information in the position of a magnetic domain wall in a ferromagnetic wire. We show that a single three-terminal device can perform inverter and buffer operations. We demonstrate one device can drive two subsequent gates and logic propagation in a circuit of three inverters. This prototype demonstration shows that magnetic domain wall logic devices have the necessary characteristics for future computing, including nonlinearity, gain, cascadability, and room temperature operation.
We report a combined directing effect
of the simultaneously applied
graphoepitaxy and electric field on the self-assembly of cylinder
forming polystyrene-b-poly(dimethylsiloxane) block
copolymer in thin films. A correlation length of up to 20 μm
of uniaxial ordered striped patterns is an order of magnitude greater
than that produced by either graphoepitaxy or electric field alignment
alone and is achieved at reduced annealing times. The angle between
the electric field direction and the topographic guides as well as
the dimensions of the trenches affected both the quality of the ordering
and the direction of the orientation of cylindrical domains: parallel
or perpendicular to the topographic features. We quantified the interplay
between the electric field and the geometry of the topographic structures
by constructing the phase diagram of microdomain orientation. This
combined approach allows the fabrication of highly ordered block copolymer
structures using macroscopically prepatterned photolithographic substrates.
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