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Updated: Jul 9, 2025

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

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单颗粒纳米钻石中的空缺陷感知了从传输电子显微镜网格上的纳米颗粒发出的磁性过渡金属旋转噪声

Bradley T Flinn1, Valentin Radu2, Michael W Fay3

  • 1School of Chemistry, University of Nottingham, University Park Nottingham NG7 2RD UK andrei.khlobystov@nottingham.ac.uk.

Nanoscale advances
|November 29, 2023
PubMed
概括

研究人员使用钻石纳米颗粒中的空位 (NV) 旋转来探测磁性纳米颗粒. 这种技术精确地绘制了纳米级的磁性特性,推进了诸如自旋电子和数据存储等量子技术.

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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