Microwave and spin transfer torque driven coherent control in ferromagnets

TL;DR

This paper explores the theoretical foundations of coherent control in ferromagnets using microwave and spin transfer torque, aiming to enable low-power, radiation-free quantum manipulation with potential applications in spintronics and quantum computing.

Contribution

It introduces a theoretical framework for coherent manipulation in ferromagnetic systems, highlighting the role of spin currents and magnetic anisotropy in controlling coherence and Rabi oscillations.

Findings

Coherent manipulation can be enhanced by spin polarized currents.

Magnetic anisotropy acts as an additional oscillatory drive.

Controlling Gilbert losses influences coherence decay rates.

Abstract

Coherent control is a method used to manipulate the state of matter using oscillatory electromagnetic radiation which relies on the non-adiabatic interaction. It is commonly applied in quantum processing applications. This technique is interesting in the context of ferromagnetic materials because of the ability to combine it with spintronics for the purpose of fundamental spin transport research, low-power information processing, and potentially future quantum bit (Qubit) applications. In this work we address the theoretical grounds of coherent manipulation in practical ferromagnetic systems. We study electromagnetic radiation driven interaction that is enhanced in the presence of spin polarized currents and map the conditions that allow coherent manipulation for which Rabi oscillations take place. The role of the magnetic anisotropy field is shown to act as an additional oscillatory driving field. We discuss the Gilbert losses in the context of effective coherence decay rates and show that it is possible to control these rates by application of a static spin current. The case of coherent manipulation using oscillatory spin currents that is free of radiation is discussed as well. Our work paves the way towards spin current amplification as well as radiation-free coherent control schemes that may potentially lead to novel Qubits that are robust and scalable.