Nanoscale magnetic field sensing with spin-Hall nano-oscillator devices

2023/03/04 by Yanyou Xie, Xie, Yanyou, Hil Fung Harry Cheung +3
Engineering · Physics and Astronomy · #FOS: Physical sciences #Magnetic Field Sensors Techniques #Magnetic properties of thin films #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum and electron transport phenomena

paper · pdf · doi:10.48550/arxiv.2303.02478

openalex publication_date 2023/03/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

In this work, we develop a nanoscale magnetic field sensor based on a spin-Hall nano-oscillator (SHNO) device. We fabricate constriction-based SHNO devices using Ni₈₁Fe₁₉/Au_0.25Pt_0.75 bilayer and use them to demonstrate quasi-DC sensing up to kilohertz-scale frequencies under a bias field of 400 Oe in the sample plane. The magnetic field sensing is based on the linear dependence of SHNO oscillation frequency on external magnetic field. The detectivity of the sensor is as low as 0.21 μT/√(Hz) at 100 Hz, with an effective sensing area of 0.32 μm², making SHNO devices suitable for scanning probe nanoscale magnetometry.

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