A Frequency-Controlled Magnetic Vortex Memory

TL;DR

This paper introduces a novel non-volatile memory concept utilizing frequency-controlled magnetic vortex states in NiMnSb nano-dots, enabling deterministic binary data storage through resonance frequency manipulation.

Contribution

The study demonstrates a new frequency-based control method for magnetic vortex memory using bias magnetic fields and microwave pulses in NiMnSb nano-dots.

Findings

Successful frequency splitting of vortex core gyrotropic modes.

Deterministic binary memory addressing via microwave resonance.

Potential for low-power, high-density magnetic memory applications.

Abstract

Using the ultra low damping NiMnSb half-Heusler alloy patterned into vortex-state magnetic nano-dots, we demonstrate a new concept of non-volatile memory controlled by the frequency. A perpendicular bias magnetic field is used to split the frequency of the vortex core gyrotropic rotation into two distinct frequencies, depending on the sign of the vortex core polarity $p=\pm1$ inside the dot. A magnetic resonance force microscope and microwave pulses applied at one of these two resonant frequencies allow for local and deterministic addressing of binary information (core polarity).