Synchronized spin torque nano-oscillators: From theory to applications

Abstract

Spintronics is a very promising emerging technology which has already enabled several market products–from hard disk read heads to dense memories. Recent research in spin torque nano-oscillators (STNO) has opened the possibility of using electron spin to generate sustained microwave oscillations. Furthermore, the experimental verification of synchronization of STNOs can allow communication and computation with nanoscale oscillators. In this work, we look at a promising novel circuit topology using a hybrid MOSFET/STNO array which can be used for diverse sets of applications ranging from neurocomputation to nano-scale RF applications. We first consider the physics and oscillatory theory which allows the STNOs to synchronize and communicate with each other. We next focus on the practical STNO device geometries which can be used to realize a physical parallel-connected array. We propose using a dual barrier magnetic tunnel junction (DMTJ) to produce strong, harmonic oscillation signals in the absence on an external magnetic field. Finally, we use circuit level simulations of a hybrid MOSFET/STNO array to show how it can be used for different applications.