p -anisotropy: A nanocarbon route to hard magnetism
p -anisotropy: A nanocarbon route to hard magnetism
复制标题
p 各向异性：通向硬磁性的纳米碳途径
DOI：
10.1103/physrevb.101.060408
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发表时间：
2020
影响因子：
3.7
通讯作者：
Moorsom T
中科院分区：
文献类型：
--
作者：
Moorsom T
高矫顽力磁体是可再生能源、电动汽车和存储技术的重要资源。大多数硬磁材料都含有钕和钐等稀土元素，但对这些材料的环境影响和供应稳定性的担忧促使人们研究替代品。在这里，我们提出了一个混合双层钴和nanocarbon moleculewhich表现出显着增强的磁性与最小的减少磁化。我们演示了如何各向异性增强效应不能描述现有的模型的分子-金属磁性界面。我们概述了一种形式的各向异性，所产生的不对称磁电耦合在金属分子界面。由于这种现象是由杂化轨道引起的，我们建议称这种效应为各向异性。虽然这种效应的临界温度目前受到所选分子的旋转自由度的限制，但我们描述了表面官能化如何允许室温碳基硬磁膜的设计。
High coercivity magnets are an important resource for renewable energy, electric vehicles, and memory technologies. Most hard magnetic materials incorporate rare earths such as neodymium and samarium, but concerns about the environmental impact and supply stability of these materials are prompting research into alternatives. Here, we present a hybrid bilayer of cobalt and the nanocarbon moleculewhich exhibits significantly enhanced coercivity with minimal reduction in magnetization. We demonstrate how this anisotropy enhancing effect cannot be described by existing models of molecule-metal magnetic interfaces. We outline a form of anisotropy, arising from asymmetric magnetoelectric coupling in the metal-molecule interface. Because this phenomenon arises fromhybrid orbitals, we propose calling this effect-anisotropy. While the critical temperature of this effect is currently limited by the rotational degree of freedom of the chosen molecule,, we describe how surface functionalization would allow for the design of room-temperature, carbon-based hard magnetic films.