Spin Amplification by Controlled Symmetry Breaking for Spin-Based Logic

TL;DR

This paper introduces a novel spin amplification method using controlled symmetry breaking to enhance spintronic logic circuits, leveraging voltage-controlled magnetic properties to achieve efficient magnetization control with small spin currents.

Contribution

It proposes a new spin amplification concept based on bringing ferromagnets into an unstable symmetric state using voltage-controlled magnetic effects, enabling small spin currents to control magnetization.

Findings

Proposes voltage-controlled Curie temperature and magnetic anisotropy methods.

Highlights the importance of 2D magnetic materials for practical implementation.

Demonstrates potential for improved spintronic logic circuits.

Abstract

Spin amplification is one of the most critical challenges for spintronics and spin-based logic in order to achieve spintronic circuits with fan-out. We propose a new concept for spin amplification that will allow a small spin current in a non-magnetic spin channel to control the magnetization of an attached ferromagnet. The key step is to bring the ferromagnet into an unstable symmetric state (USS), so that a small spin transfer torque from a small spin current can provide a magnetic bias to control the spontaneous symmetry breaking and select the final magnetization direction of the ferromagnet. Two proposed methods for achieving the USS configuration are voltage-controlled Curie temperature (VC-TC) and voltage-controlled magnetic anisotropy (VC-MA). We believe the development of new 2D magnetic materials with greater tunability of VC-TC and VC-MA will be needed for practical applications. A successful realization of spin amplification by controlled symmetry breaking will be important for the implementation of existing spin-logic proposals (e.g. "All Spin Logic") and could inspire alternative ideas for spintronic circuits and devices.