Thermal Characterization of Ultrathin MgO Tunnel Barriers.

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Nano Letters Pub Date : 2024-11-06 DOI:10.1021/acs.nanolett.4c02571

Haotian Su, Heungdong Kwon, Fen Xue, Noriyuki Sato, Usha Bhat, Wilman Tsai, Michel Bosman, Mehdi Asheghi, Kenneth E Goodson, Eric Pop, Shan X Wang

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Abstract

Magnetic tunnel junctions (MTJs) with ultrathin MgO tunnel barriers are at the heart of magnetic random-access memory (MRAM) and exhibit potential for spin caloritronics applications due to the tunnel magneto-Seebeck effect. However, the high programming current in MRAM can cause substantial heating which degrades the endurance and reliability of MTJs. Here, we report the thermal characterization of ultrathin CoFeB/MgO multilayers with total thicknesses of 4.4, 8.8, 22, and 44 nm, and with varying MgO thicknesses (1.0, 1.3, and 1.6 nm). Through time-domain thermoreflectance (TDTR) measurements and thermal modeling, we extract the intrinsic (∼3.6 W m^-1 K^-1) and effective (∼0.85 W m^-1 K^-1) thermal conductivities of annealed 1.0 nm thick MgO at room temperature. Our study reveals the thermal properties of ultrathin MgO tunnel barriers, especially the role of thermal boundary resistance, and contributes to a more precise thermal analysis of MTJs to improve the design and reliability of MRAM technologies.

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超薄氧化镁隧道势垒的热特性分析。

具有超薄氧化镁隧道势垒的磁隧道结（MTJ）是磁性随机存取存储器（MRAM）的核心，由于隧道磁-塞贝克效应，MTJ 在自旋热电子学应用方面具有潜力。然而，MRAM 中的高编程电流会导致大量发热，从而降低 MTJ 的耐用性和可靠性。在此，我们报告了总厚度为 4.4、8.8、22 和 44 nm，氧化镁厚度为 1.0、1.3 和 1.6 nm 的超薄 CoFeB/MgO 多层膜的热特性。通过时域热反射（TDTR）测量和热建模，我们提取了室温下退火的 1.0 nm 厚氧化镁的固有热导率（∼ 3.6 W m-1 K-1）和有效热导率（∼ 0.85 W m-1 K-1）。我们的研究揭示了超薄氧化镁隧道势垒的热特性，尤其是热边界电阻的作用，有助于对 MTJ 进行更精确的热分析，从而改进 MRAM 技术的设计和可靠性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.