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
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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
Yoshida Takashi
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Du Zhongzhou;Sun Yi;Higashi Oji;Enpuku Keiji;Yoshida Takashi

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众所周知,实际磁性纳米粒子(MNP)样品的核尺寸分布广泛。本研究调查了磁性纳米颗粒温度计(MNPT)的交流磁化的谐波的经验表达式,并使用两个主要的核心直径近似的核心尺寸分布的影响。当交流磁场频率为200 Hz时,由双芯径朗之万函数(双芯径模型)计算得到的谐波与实验数据吻合较好。当频率为3kHz时,布朗弛豫效应不可忽略,通过适当选择模型参数,谐波也可以用双芯径模型经验表示。简单的两个核心直径模型是有用的,当MNP样品与核心大小分布用于MNPT。
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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