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arXiv 1402.6780cond-mat.mes-hall
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基于碳纳米管谐振器的磁力灵敏检测

Sensitive Magnetic Force Detection with a Carbon Nanotube Resonator

Kyle Willick, Chris Haapamaki, Jonathan Baugh

摘要:

我们提出了一种灵敏的磁点力检测技术,使用悬浮碳纳米管(CNT)的机械谐振器结合由铁磁栅电极产生的磁场梯度。机械共振频率的数值计算表明,单个玻尔磁子的变化,在一个单独的磁性分子接枝到CNT的磁状态可以转化为可检测的频率偏移,在几kHz的顺序。的依赖性的谐振器响应设备参数,如长度,张力,CNT直径,和栅极电压进行了探讨,并确定了最佳的操作条件。信噪比分析表明,在原则上,磁开关在一个单一的玻尔磁子的水平,可以读出在一个Single Shot的时间尺度短至10微秒。这种力传感器应该能够在孤立的单分子磁体中进行自旋动力学的新研究,不受通常研究的晶体或系综设置的影响。

英文摘要:

We propose a technique for sensitive magnetic point force detection using a suspended carbon nanotube (CNT) mechanical resonator combined with a magnetic field gradient generated by a ferromagnetic gate electrode. Numerical calculations of the mechanical resonance frequency show that single Bohr magneton changes in the magnetic state of an individual magnetic molecule grafted to the CNT can translate to detectable frequency shifts, on the order of a few kHz. The dependences of the resonator response to device parameters such as length, tension, CNT diameter, and gate voltage are explored and optimal operating conditions are identified. A signal-to-noise analysis shows that in principle, magnetic switching at the level of a single Bohr magneton can be read out in a single shot on timescales as short as 10 microseconds. This force sensor should enable new studies of spin dynamics in isolated single molecule magnets, free from the crystalline or ensemble settings typically studied.

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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