六方碳环上的Co二聚体作为亚纳米磁存储比特
Co dimers on hexagonal carbon rings proposed as subnanometer magnetic storage bits
摘要：
通过密度泛函和从头算量子化学计算表明，过渡金属-碳系统具有将目前可实现的磁纪录面密度提高三个数量级的潜力。以直径为0.5nm的Co_2-苯为模型体系进行了研究。它显示出每个分子0.1 eV的磁各向异性，大到足以在远大于4 K的温度下永久存储一位信息。如果钴二聚体沉积在石墨烯或石墨上，则可以预期类似的性能。同时施加中等强度的磁场和强电场可以实现亚纳米级的位写入。
英文摘要：
It is demonstrated by means of density functional and ab-initio quantum chemical calculations, that transition metal - carbon systems have the potential to enhance the presently achievable area density of magnetic recording by three orders of magnitude. As a model system, Co_2-benzene with a diameter of 0.5 nm is investigated. It shows a magnetic anisotropy in the order of 0.1 eV per molecule, large enough to store permanently one bit of information at temperatures considerably larger than 4 K. A similar performance can be expected, if cobalt dimers are deposited on graphene or on graphite. It is suggested that the subnanometer bits can be written by simultaneous application of a moderate magnetic and a strong electric field.
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