Magnetic resonance force microscopy of paramagnetic electron spins at millikelvin temperatures.
Magnetic resonance force microscopy of paramagnetic electron spins at millikelvin temperatures.
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DOI：
10.1038/ncomms1581
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发表时间：
2011-05
影响因子：
16.6
通讯作者：
A. Vinante;G. Wijts;O. Usenko;L. Schinkelshoek;T. Oosterkamp
中科院分区：
文献类型：
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作者：
A. Vinante;G. Wijts;O. Usenko;L. Schinkelshoek;T. Oosterkamp
磁共振力显微镜（MRFM）是一种检测少量自旋的强大技术，它依赖于超软磁性悬臂梁的力检测和自旋的选择性磁共振操作。MRFM在超低温下运行将大大受益，因为它可以降低热机械噪声，增加热自旋极化。在这里，我们展示了MRFM在低至30 mK的温度下的操作，这要归功于最近开发的基于超导量子干涉器件（SQUID）的悬臂探测技术，该技术可以避免悬臂过热。在我们的实验中，我们在温度低至毫开尔文的硅表面检测到悬垂键顺磁中心。这些缺陷的波动被认为与squid中的1/f磁噪声和退相干有关，也与几个超导和单自旋量子比特有关。我们发现了自旋扩散在低温自旋动力学中起关键作用的证据。
Magnetic resonance force microscopy (MRFM) is a powerful technique to detect a small number of spins that relies on force detection by an ultrasoft magnetically tipped cantilever and selective magnetic resonance manipulation of the spins. MRFM would greatly benefit from ultralow temperature operation, because of lower thermomechanical noise and increased thermal spin polarization. Here we demonstrate MRFM operation at temperatures as low as 30 mK, thanks to a recently developed superconducting quantum interference device (SQUID)-based cantilever detection technique, which avoids cantilever overheating. In our experiment, we detect dangling bond paramagnetic centres on a silicon surface down to millikelvin temperatures. Fluctuations of such defects are supposedly linked to 1/fmagnetic noise and decoherence in SQUIDs, as well as in several superconducting and single spin qubits. We find evidence that spin diffusion has a key role in the low-temperature spin dynamics.