Magnetic dipolar coupling and collective effects for binary information codification in cost-effective logic devices

摘要: Abstract Physical limitations foreshadow the eventual end to traditional Complementary Metal Oxide Semiconductor (CMOS) scaling. Therefore, interest has turned various materials and technologies aimed succeed CMOS. Magnetic Quantum dot Cellular Automata (MQCA) are one of these technologies. Working MQCA arrays require very complex techniques an excellent control on geometry nanomagnets quality magnetic thin film, thus limiting possibility for representing a definite solution cost-effective, high density low power consumption device demand. Counter-intuitively, moving towards bigger sizes lighter it is still possible develop multi-state logic devices, as we demonstrated, whose main advantage cost-effectiveness. Applications may be seen in cost devices where integration computational not issue, eventually using flexible substrates taking intrinsic mechanical toughness systems long range interactions do need wirings. We realized cobalt micrometric by means Electron Beam Lithography, exploiting cost-effective processes such lift-off RF sputtering that usually avoided due their array film roughness. Information relative configuration elements including was obtained from Force Microscope (MFM) images, enhanced numerical procedure presented differential maps. report existence bi-stable patterns, detected MFM while sampling z-component induction field, arising dipolar inter-element magnetostatic coupling, able store propagate binary information. This achieved despite element state, which multi-domain, respectively. discuss detail shape, spacing profile effects coupling. Numerical Finite Element Method (FEM) simulations show microspin arrangement producing