Room 120 Physics Building
MU Assistant Professor of Physics Deepak Singh presents, "Spring of Surprises in Artificial Honeycomb Lattice," Monday, April 24 at 4 p.m. in Room 120, Physics Building. Refreshments will be served at 3:30 p.m. in Room 223A.
Two-dimensional magnetic nanostructured geometries, such as artificial magnetic honeycomb lattice, provide new facile platform to explore many novel properties of magnetic materials in one systems. Originally envisaged to explore the physics of effective magnetic monopoles (few years ago), artificial honeycomb lattice has emerged as a key playground to discover new and exotic magnetic phases, such as magnetic charge ordered state and spin solid state, that are not possible in bulk materials. We have created a new artificial honeycomb lattice of ultra-small bond in this pursuit. In addition to the investigation of novel magnetism, I will discuss several new experimental observations that were totally unexpected in the newly designed system. In one instance, a diode-type rectification, which persists to room temperature, is detected in the electronic measurements on the moderately thick soft magnetic honeycomb lattice. Replacing soft magnet by an antiferromagnetic material seems to induce magnetic Wigner crystal formation in the lattice. These surprising results in a relatively new system bring new spring to this field.