Electromagnetic field enhancement and its application in spin rectification

A subwavelength antenna, which has the capability to enhance both the microwave electric and magnetic fields, is proposed for use in spintronic devices. The geometric resonance of the microwave electric and magnetic fields in the antenna are determined by spintronic techniques, and are in remarkable agreement with measurements taken using a vector network analyzer and simulations based on the finite-difference time-domain method. Our simulations predict that the performance of a spin dynamo may be improved by three orders of magnitude if properly integrated with this antenna on-chip. (C) 2013 The Japan Society of Applied Physics