Noise characterization of STT-based Nanoscale magnetic tunnel junction magnetic sensors

IF 2.5 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2025-05-29 DOI:10.1016/j.jmmm.2025.173215

Kosuke Komuro , Hugo Nicolas , Bernard Dieny , Daiki Oshima , Takeshi. Kato , Ricardo C. Sousa

{"title":"Noise characterization of STT-based Nanoscale magnetic tunnel junction magnetic sensors","authors":"Kosuke Komuro , Hugo Nicolas , Bernard Dieny , Daiki Oshima , Takeshi. Kato , Ricardo C. Sousa","doi":"10.1016/j.jmmm.2025.173215","DOIUrl":null,"url":null,"abstract":"<div><div>Recently, the trend towards electrification has led to the widespread use of magnetic sensors in various applications. Magnetic tunnel junction (MTJ)-based magnetic sensors exhibiting very high sensitivity, compactness, and small dimensions could offer significant advantages over existing technologies such as conventional Hall effect sensors. New sensor concepts have been explored such as spin transfer torque (STT)-based MTJ magnetic sensors which have the potential to enable magnetic field detection with fine spatial resolutions of 50 to 100 nm and micro-Tesla resolution. This paper analyzes and describes the noise characteristics of STT-based MTJ sensors. Calculations and experimental results demonstrate that the signal-to-noise ratio (SNR) of the STT-based MTJ sensor is proportional to the square of the thermal stability factor, which is the ratio of the energy barrier of magnetization reversal and the thermal energy. This finding opens the way for future advances through predictive modelling of the sensing element and a deeper understanding of the noise sources in the proposed device.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173215"},"PeriodicalIF":2.5000,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Magnetism and Magnetic Materials","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0304885325004470","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Recently, the trend towards electrification has led to the widespread use of magnetic sensors in various applications. Magnetic tunnel junction (MTJ)-based magnetic sensors exhibiting very high sensitivity, compactness, and small dimensions could offer significant advantages over existing technologies such as conventional Hall effect sensors. New sensor concepts have been explored such as spin transfer torque (STT)-based MTJ magnetic sensors which have the potential to enable magnetic field detection with fine spatial resolutions of 50 to 100 nm and micro-Tesla resolution. This paper analyzes and describes the noise characteristics of STT-based MTJ sensors. Calculations and experimental results demonstrate that the signal-to-noise ratio (SNR) of the STT-based MTJ sensor is proportional to the square of the thermal stability factor, which is the ratio of the energy barrier of magnetization reversal and the thermal energy. This finding opens the way for future advances through predictive modelling of the sensing element and a deeper understanding of the noise sources in the proposed device.

查看原文本刊更多论文

基于stt的纳米磁性隧道结磁传感器的噪声特性研究

最近，电气化的趋势导致了磁传感器在各种应用中的广泛使用。基于磁隧道结（MTJ）的磁传感器具有非常高的灵敏度、紧凑性和小尺寸，与传统霍尔效应传感器等现有技术相比，具有显著的优势。新的传感器概念已经被探索，例如基于自旋传递扭矩（STT）的MTJ磁传感器，它有可能实现50到100纳米的精细空间分辨率和微特斯拉分辨率的磁场检测。分析和描述了基于stt的MTJ传感器的噪声特性。计算和实验结果表明，基于stt的MTJ传感器的信噪比（SNR）与热稳定因子的平方成正比，热稳定因子是磁化反转能势与热能的比值。这一发现通过对传感元件的预测建模和对拟议设备中的噪声源的更深入了解，为未来的进步开辟了道路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.