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, S. H. Liao, Hsin Hsien Chen, M. J. Chen, K. L. Chen, Herng Er Horng, S. Y. Yang, L. M. Wang

Research output: Contribution to journalArticle

11 Citations (Scopus)

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

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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