On–Off Magnetism of Ferromagnetic Metals via Electrochemical Driven Band Filling

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-03-12 DOI:10.1021/acs.nanolett.5c0045110.1021/acs.nanolett.5c00451

Zeyuan Bu, Xiang Li, Leqing Zhang, Qingtao Xia, Haoyu Fu, Haining Liu, Lihao Qin, Dongyun Chen*, Shishen Yan and Qiang Li*,

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Abstract

Ferromagnetic metals, distinguished by high Curie temperatures and magnetization, are crucial in voltage-controlled magnetism for potential room-temperature applications in low-power multifunctional devices. Despite numerous attempts based on various mechanisms, achieving ideal magnetic modulation in metals remains challenging. This work proposes a new mechanism to control bulk metal magnetism by modulating valence electron filling in spin-polarized bands, leveraging the Slater–Pauling rule in alloys. Fully reversible on–off switching of ferromagnetism is realized in a 70 nm thick Sn–Co alloy film, with a modulation amplitude approaching 40 emu g^–1 within 1.5 V. Operando magnetometry demonstrates superior magnetic modulation with nonvolatility, robust durability with rapid response. Furthermore, this strategy exploits band filling by a nonmagnetic metal’s valence electrons during alloying, showcasing universality confirmed by significant magnetic switching in Sb–Co and Sn–Fe alloys. These results introduce a novel magnetic modulation method in bulk metals and, crucially, suggest a versatile and straightforward design paradigm for magnetic manipulation.

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通过电化学驱动带填充的铁磁性金属的开关磁性

铁磁性金属具有高居里温度和高磁化率的特点，在低功耗多功能设备的潜在室温应用中对电压控制磁性至关重要。尽管基于各种机制进行了大量尝试，但在金属中实现理想的磁性调制仍具有挑战性。这项研究提出了一种新机制，利用合金中的斯莱特-保龄法则，通过调制自旋极化带中的价电子填充来控制块状金属磁性。在 70 nm 厚的锡钴合金薄膜中实现了铁磁性的完全可逆开关，调制幅度在 1.5 V 内接近 40 emu g-1。操作磁力计显示出卓越的磁性调制能力、非波动性、坚固耐用性和快速响应能力。此外，这种策略还利用了合金化过程中非磁性金属价电子的带填充，通过在锑钴合金和锡铁合金中显著的磁切换证实了其普遍性。这些结果在块状金属中引入了一种新的磁调制方法，更重要的是，它为磁操控提出了一种通用而简单的设计范例。

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.