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Fundamentals and Applications of Dia...

Wang, Ning.

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Fundamentals and Applications of Diamond Quantum Sensing of Magnetic Nanoparticles.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Fundamentals and Applications of Diamond Quantum Sensing of Magnetic Nanoparticles./
作者:	Wang, Ning.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	178 p.
附註:	Source: Dissertations Abstracts International, Volume: 80-10, Section: B.
Contained By:	Dissertations Abstracts International80-10B.
標題:	Nanoscience. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13890463
ISBN:	9781392078235

Fundamentals and Applications of Diamond Quantum Sensing of Magnetic Nanoparticles.
Wang, Ning.

Fundamentals and Applications of Diamond Quantum Sensing of Magnetic Nanoparticles. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 178 p.

Source: Dissertations Abstracts International, Volume: 80-10, Section: B.

Thesis (Ph.D.)--The Chinese University of Hong Kong (Hong Kong), 2019.

This item must not be added to any third party search indexes.

Magnetic nanoparticles have broad applications in information storage, bio-medicine, life science, and paleology. They are also an interesting platform for studying condensed matter physics at the nanoscale. However, it is challenging to study the magnetic properties of individual nanoparticles under ambient conditions. The nitrogen-vacancy (NV) center in diamond is promising for nanoscale quantum sensing due to its atomic size and long spin coherence time. It is an ideal probe to study nanomagnetism. This thesis presents our experimental studies of single magnetic nanoparticles (MNPs) near their phase transition temperatures, with nearby NV centers as nanoscale sensors. Firstly, we observe the phase transition of a single MNP using nanodiamond sensors. The magnetization critical exponent of single MNPs is extracted from the magnetization curve. Then, we design and experimentally demonstrate a hybrid nano-thermometer composed of NV centers and an MNP. The temperature sensitivity is enhanced by the magnetic criticality of the MNP near its ferromagnetism-paramagnetism transition. We achieve a sensitivity of 11 mK= √Hz under ambient conditions. A nano-thermometer with such sensitivity may have wide applications for studying nanoscale thermal processes. Based on the hybrid system, we observe the real-time superparamagnetic (SPM) reversal of a single MNP under ambient conditions. The SPM reversal rate monitored by the nearby NV centers covers six orders of magnitude in the time domain within 10 K temperature variation. The SPM reversal rate as a function of the temperature indicates that the Neel-Arrhenius law is still valid when the temperature is ∼ TC=20 below the critical temperature. Our method provides a supplementary platform to study the magnetization dynamics, critical behaviors, and spin fluctuations of small systems.

ISBN: 9781392078235Subjects--Topical Terms:

587832
Nanoscience.
Subjects--Index Terms:

Diamond defects center

Fundamentals and Applications of Diamond Quantum Sensing of Magnetic Nanoparticles.
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500 $a Source: Dissertations Abstracts International, Volume: 80-10, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Li, Quan.
502 $a Thesis (Ph.D.)--The Chinese University of Hong Kong (Hong Kong), 2019.
506 $a This item must not be added to any third party search indexes.
506 $a This item must not be sold to any third party vendors.
506 $a This item is not available from ProQuest Dissertations & Theses.
520 $a Magnetic nanoparticles have broad applications in information storage, bio-medicine, life science, and paleology. They are also an interesting platform for studying condensed matter physics at the nanoscale. However, it is challenging to study the magnetic properties of individual nanoparticles under ambient conditions. The nitrogen-vacancy (NV) center in diamond is promising for nanoscale quantum sensing due to its atomic size and long spin coherence time. It is an ideal probe to study nanomagnetism. This thesis presents our experimental studies of single magnetic nanoparticles (MNPs) near their phase transition temperatures, with nearby NV centers as nanoscale sensors. Firstly, we observe the phase transition of a single MNP using nanodiamond sensors. The magnetization critical exponent of single MNPs is extracted from the magnetization curve. Then, we design and experimentally demonstrate a hybrid nano-thermometer composed of NV centers and an MNP. The temperature sensitivity is enhanced by the magnetic criticality of the MNP near its ferromagnetism-paramagnetism transition. We achieve a sensitivity of 11 mK= √Hz under ambient conditions. A nano-thermometer with such sensitivity may have wide applications for studying nanoscale thermal processes. Based on the hybrid system, we observe the real-time superparamagnetic (SPM) reversal of a single MNP under ambient conditions. The SPM reversal rate monitored by the nearby NV centers covers six orders of magnitude in the time domain within 10 K temperature variation. The SPM reversal rate as a function of the temperature indicates that the Neel-Arrhenius law is still valid when the temperature is ∼ TC=20 below the critical temperature. Our method provides a supplementary platform to study the magnetization dynamics, critical behaviors, and spin fluctuations of small systems.
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