Temperature and concentration-dependent relaxation of ferrofluids characterized with a high-T c SQUID-based nuclear magnetic resonance spectrometer

Hong-Chang Yang, Chieh Wen Liu, Shu-Hsien Liao, Hsin Hsien Chen, M. J. Chen, K. L. Chen, Herng-Er Horng, Shieh-Yueh Yang, L. M. Wang

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Abstract

We investigated the relaxation of protons in magnetic fluids using a high-T c SQUID magnetometer. It was found that the longitudinal relaxation rate, 1/T 1, is slower than the transverse relaxation rate, 1/T 2, for ferrofluids in the same field. This is due to the fact that the 1/T 1 process involves returning the magnetization to the z-direction, which automatically involves the loss of magnetization in the x-y plane governed by the 1/T 2 process. Additionally, 1/T 1 and 1/T 2 at high temperatures are slower than the corresponding relaxation rates at low temperatures, which is due to the enhanced Brownian motion of nanoparticles at high temperatures.

Original languageEnglish
Article number202405
JournalApplied Physics Letters
Volume100
Issue number20
DOIs
Publication statusPublished - 2012 May 14

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ferrofluids
spectrometers
nuclear magnetic resonance
magnetization
temperature
magnetometers
nanoparticles
protons
fluids

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Temperature and concentration-dependent relaxation of ferrofluids characterized with a high-T c SQUID-based nuclear magnetic resonance spectrometer. / Yang, Hong-Chang; Liu, Chieh Wen; Liao, Shu-Hsien; Chen, Hsin Hsien; Chen, M. J.; Chen, K. L.; Horng, Herng-Er; Yang, Shieh-Yueh; Wang, L. M.

In: Applied Physics Letters, Vol. 100, No. 20, 202405, 14.05.2012.

Research output: Contribution to journalArticle

Yang, Hong-Chang ; Liu, Chieh Wen ; Liao, Shu-Hsien ; Chen, Hsin Hsien ; Chen, M. J. ; Chen, K. L. ; Horng, Herng-Er ; Yang, Shieh-Yueh ; Wang, L. M. / Temperature and concentration-dependent relaxation of ferrofluids characterized with a high-T c SQUID-based nuclear magnetic resonance spectrometer. In: Applied Physics Letters. 2012 ; Vol. 100, No. 20.
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AU - Chen, Hsin Hsien

AU - Chen, M. J.

AU - Chen, K. L.

AU - Horng, Herng-Er

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