Asymmetric Electrical Transport in Symmetric Permalloy Artificial Honeycomb Lattice*

We have observed asymmetric electrical transport in macroscopic samples of artificial magnetic honeycomb lattice of Permalloy having ultra-small elements with length scales of sub - 10nm to 30nm. The unidirectional enhancement of conductivity, analogues to a semiconductor diode, is dependent on thickness of the Permalloy as well as the order of honeycomb and can persist up to room temperature. The Permalloy honeycomb lattice exhibit very small rectification voltage and power dissipation compared with semiconductor diodes, which could have strong implication for spintronics. We will present detailed investigation done on the system and shed some light on the possible mechanism behind the asymmetric transport phenomena.