Empirical expression for harmonics of AC magnetization of magnetic nanoparticles with core size distribution
Empirical expression for harmonics of AC magnetization of magnetic nanoparticles with core size distribution
复制标题
具有核心尺寸分布的磁性纳米粒子交流磁化谐波的经验表达式
DOI:
10.7567/1347-4065/ab3b7d
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发表时间:
2019-09
影响因子:
1.5
通讯作者:
Yoshida Takashi
中科院分区:
文献类型:
--
作者:
Du Zhongzhou;Sun Yi;Higashi Oji;Enpuku Keiji;Yoshida Takashi
It is well known that the core size of practical magnetic nanoparticle (MNP) samples is widely distributed. This study investigated an empirical expression for harmonics of AC magnetization of MNPs for magnetic nanoparticle thermometer (MNPT) and used two main core diameters to approximate the effect of the core size distribution. When the frequency of AC magnetic field was 200 Hz, the harmonics calculated from the Langevin function with two-core diameters (two-core-diameters model) agreed well with the experimental data. When the frequency was 3 kHz, where the effect of the Brownian relaxation could not be ignored, the harmonics could also be empirically expressed by the two-core-diameters model by adequately choosing the parameters of the model. The simple two-core-diameters model is useful when MNPs sample with core size distribution is used for MNPT.
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