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arXiv 1809.02590cond-mat.str-el
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通过掺杂提高亚稳态Skyrmions的寿命

Increased lifetime of metastable skyrmions by doping

M. T. Birch, R. Takagi, S. Seki, M. N. Wilson, F. Kagawa, A. Štefančič, G. Balakrishnan, R. Fan, P. Steadman, C. J. Ottley, M. Crisanti, R. Cubitt, T. Lancaster… 展开作者

M. T. Birch, R. Takagi, S. Seki, M. N. Wilson, F. Kagawa, A. Štefančič, G. Balakrishnan, R. Fan, P. Steadman, C. J. Ottley, M. Crisanti, R. Cubitt, T. Lancaster, Y. Tokura, P. D. Hatton

摘要:

先前对亚稳态磁skyrmion的观测表明,接近平衡口袋的亚稳态寿命很短,因此需要快速冷却才能在低温下产生大量的skyrmion。在这里,我们报告说,在Cu $_2$ OSeO $_3$中的亚稳态skyrmions的寿命延长了50倍,仅引入2.5%的锌掺杂,允许超过50%的人口生存时,场冷却速率仅为1 K/min。我们的系统研究表明,寿命的增强是由于非磁性掺杂剂的自旋去除,这在熵上限制了Skyrmion衰变途径的数量。我们期望掺杂可以被利用来控制其他手性磁体中的亚稳态SkL状态的寿命,从而提供一种将skyrmion材料工程化以应用于未来设备的方法。

英文摘要:

Previous observations of metastable magnetic skyrmions have shown that close to the equilibrium pocket the metastable state has a short lifetime, and therefore rapid cooling is required to generate a significant skyrmion population at low temperatures. Here, we report that the lifetime of metastable skyrmions in Cu$_2$OSeO$_3$ is extended by a factor of 50 with the introduction of only 2.5% zinc doping, allowing over 50% of the population to survive when field-cooling at a rate of just 1 K/min. Our systematic study suggests that the lifetime enhancement is due to the removal of spins by the non-magnetic dopant, which entropically limits the number of skyrmion decay pathways. We expect that doping can be exploited to control the lifetime of the metastable SkL state in other chiral magnets, offering a method of engineering skyrmion materials towards application in future devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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