Peculiarities of spin-orbit interaction systematically measured in FeCoB nanomagnets

TL;DR

This paper presents a new method to measure and analyze the spin-orbit interaction in FeCoB nanomagnets, revealing distinct behaviors and relationships that impact magnetic anisotropy and nanomagnet design.

Contribution

It introduces a systematic measurement approach for spin-orbit interaction in nanomagnets and uncovers its varied behaviors in different configurations.

Findings

Distinct spin-orbit behaviors in bulk and interface

Periodic oscillations in spin-orbit strength observed

Relationship between spin-orbit strength, demagnetization, and anisotropy

Abstract

This study introduces a method to measure strength of spin-orbit interaction (SO) in a nanomagnet, investigating fundamental phenomena governing magnetic anisotropy. The method explores the fundamental property of SO in its linear proportionality to the external magnetic field, a relationship validated through experimental observation. Systematic study of SO in FeCoB nanomagnets reveals distinct SO behaviors in bulk and at an interface, its substantial disparities in single- and multi-layer nanomagnets, intriguing periodic oscillations in SO strength, and the systematic relationship between SO strength, demagnetization field, and magnetic anisotropy based on surface imperfections. These findings provide crucial insights into diverse spin-orbit interaction behaviors, crucial for understanding and optimizing magnetic anisotropy and nanomagnet properties.