Magnetic Criticality Enhanced Hybrid Nanodiamond Thermometer under Ambient Conditions
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2018-03-15 |
| Journal | Physical Review X |
| Authors | Ning Wang, GangāQin Liu, Weng-Hang Leong, Hualing Zeng, Xi Feng |
| Institutions | Swabian Instruments (Germany), University of Science and Technology of China |
| Citations | 87 |
Abstract
Section titled āAbstractāNitrogen vacancy (NV) centres in diamond are attractive as quantum sensors\nowing to their superb coherence under ambient conditions. However, the NV\ncentre spin resonances are relatively insensitive to some important parameters\nsuch as temperature. Here we design and experimentally demonstrate a hybrid\nnano-thermometer composed of NV centres and a magnetic nanoparticle (MNP), in\nwhich the temperature sensitivity is enhanced by the critical magnetization of\nthe MNP near the ferromagnetic-paramagnetic transition temperature. The\ntemperature susceptibility of the NV center spin resonance reached 14 MHz/K,\nenhanced from the value without the MNP by two orders of magnitude. The\nsensitivity of a hybrid nano-thermometer composed of a Cu_{1-x}Ni_{x} MNP and a\nnanodiamond was measured to be 11 mK/Hz^{1/2} under ambient conditions. With\nsuch high-sensitivity, we monitored nanometer-scale temperature variation of\n0.3 degree with a time resolution of 60 msec. This hybrid nano-thermometer\nprovides a novel approach to studying a broad range of thermal processes at\nnanoscales such as nano-plasmonics, sub-cellular heat-stimulated processes,\nthermodynamics of nanostructures, and thermal remanent magnetization of\nnanoparticles.\n