Memory-bit selective recording in vortex-core cross-point architecture

TL;DR

This paper demonstrates a reliable, low-power method for selective memory bit recording in vortex-core arrays using tailored magnetic fields and orthogonal current lines, advancing vortex-based nonvolatile memory technology.

Contribution

It introduces a novel technique for selective vortex-core switching in a 2x2 array, enabling efficient and reliable memory bit selection and recording.

Findings

Successful demonstration of selective vortex-core switching.

Low-power and reliable memory operation achieved.

Potential for scalable vortex-based nonvolatile memory devices.

Abstract

In our earlier work [Appl. Phys. Lett. 92, 022509 (2008)], we proposed nonvolatile vortex random access memory (VRAM) based on the energetically stable twofold ground state of vortex-core magnetizations as information carrier. Here we experimentally demonstrate reliable memory bit selection and low-power-consumption recording in a two-by-two vortex-state dot array. The bit selection and core switching is made by flowing currents along two orthogonal addressing electrode lines chosen among the other crossed electrodes. Tailored pulse-type rotating magnetic fields are used for efficiently switching a vortex core only at the intersection of the two orthogonal electrodes. This robust mechanism provides reliable bit selection and information writing operations in a potential VRAM device.