Sensitive Magnetic Force Detection with a Carbon Nanotube Resonator
arXiv:1402.6780 · doi:10.1063/1.4868686
Abstract
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.
Pages 1-6 are the main paper, pages 7-11 are supplementary material
References in corpus (15)
- A tunable carbon nanotube electromechanical oscillator
- A Mechanical Mass Sensor with Yoctogram Resolution
- Will spin-relaxation times in molecular magnets permit quantum information processing?
- Ultimate limits to inertial mass sensing based upon nanoelectromechanical systems
- Scanning nano-SQUID with single electron spin sensitivity
- Ultrasensitive force detection with a nanotube mechanical resonator
- Carbon nanotubes as ultra-high quality factor mechanical resonators
- Electron Transport in Very Clean, As-Grown Suspended Carbon Nanotubes
- Digital and FM demodulation of a doubly-clamped single wall carbon nanotube oscillator: towards a nanotube cell phone
- Force-detected nuclear magnetic resonance: Recent advances and future challenges
- Coherent Manipulation and Decoherence of S=10 Single-Molecule Magnets
- Probing the charge of a quantum dot with a nanomechanical resonator
- Single electron tunneling through high-Q single-wall carbon nanotube NEMS resonators
- Pump-Probe Experiments on the Single-Molecule Magnet Fe8 : Measurement of Excited Level Lifetimes
- Radiation- and Phonon-Bottleneck-Induced Tunneling in the Fe8 Single-Molecule Magnet