磁粒子动力学中的布朗松弛时间和纳氏松弛时间

2013 International Workshop on Magnetic Particle Imaging (IWMPI) Pub Date : 2013-03-23 DOI:10.1109/IWMPI.2013.6528375

R. Deissler, M. Martens, Y. Wu, R. Brown

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引用次数: 6

摘要

众所周知的布朗弛豫和nsamel弛豫时间TB和TN的方程(在引言中给出)不足以确定是否可以忽略nsamel弛豫机制。事实上，在足够大的磁场强度下，纳氏弛豫时间可以发生好几个数量级的变化，而布朗弛豫时间对磁场强度相对不敏感。因此，即使τN >> τB, nsamel松弛机制仍然可以是重要的，甚至占主导地位。

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Brownian and Néel relaxation times in magnetic particle dynamics

The equations for the well-known Brownian and Néel relaxation times T_B and T_N (given in the Introduction) are not sufficient to determine whether or not the Néel relaxation mechanism may be neglected. In fact, for a sufficiently large magnetic field strength, the Néel relaxation time can change by many orders of magnitude, whereas the Brownian relaxation time is comparatively insensitive to the magnetic field strength. Therefore, even if τ_N >> τ_B, the Néel relaxation mechanism can still be important and even dominate.

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2013 International Workshop on Magnetic Particle Imaging (IWMPI)

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