Magnetic Bubblecade Memory

TL;DR

This paper introduces a novel magnetic memory device that uses chiral domain walls and alternating magnetic fields to achieve unidirectional motion without current injection or structural changes, enabling 2D data storage.

Contribution

The study presents a new scheme for magnetic memory that exploits chiral domain walls and magnetic fields, eliminating the need for current injection or structural modulation.

Findings

Achieved coherent unidirectional motion of magnetic bubbles using alternating magnetic fields.

Demonstrated a prototype of magnetic bubblecade memory with 2D data storage.

Utilized chiral domain walls with asymmetric speed to enable motion without current or structural changes.

Abstract

Unidirectional motion of magnetic domain walls is the key concept underlying next-generation domain-wall-mediated memory and logic devices. Such motion has been achieved either by injecting large electric currents into nanowires or by employing domain-wall tension induced by sophisticated structural modulation. Herein, we demonstrate a new scheme without any current injection or structural modulation. This scheme utilizes the recently discovered chiral domain walls, which exhibit asymmetry in their speed with respect to magnetic fields. Because of this asymmetry, an alternating magnetic field results in the coherent motion of the domain walls in one direction. Such coherent unidirectional motion is achieved even for an array of magnetic bubble domains, enabling the design of a new device prototype-magnetic bubblecade memory-with two-dimensional data-storage capability.