Magnetic Core-Size Distribution of Magnetic Nanoparticles Estimated from Magnetization, AC Susceptibility, and Relaxation Measurements

Ahmed L. Elrefai, Teruyoshi Sasayama, Takashi Yoshida, Keiji Enpuku

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The magnetic core-size distribution of magnetic nanoparticles (MNPs) was estimated from three independent measurements, i.e., magnetization, ac susceptibility (ACS), and magnetic relaxation (MRX). First, distribution of magnetic moment m in MNP sample was estimated by analyzing the static magnetization (M - H) curve of the MNP sample in suspension. Next, distribution of anisotropy energy E was estimated by analyzing the ACS of immobilized MNP sample measured from 10 Hz to 1 MHz. The ACS measurement in much lower frequency range was substituted by the MRX measurement. MRX of immobilized MNP sample was measured from 2 to 104 s, corresponding to the frequency range from 10-4 to 0.5 Hz in ACS measurement. The relaxation curve was analyzed using a newly developed analytical method to estimate the E distribution of the MNPs in the range of large E values. Then, the estimated distributions of m and E were transferred to the distributions of magnetic core size. Core-size distributions obtained from m and E distributions reasonably agreed with each other. Namely, we obtained similar core-size distribution from static and dynamic properties of MNP sample, confirming the validity of the present method. Therefore, the present method can be useful to estimate the core-size distribution of MNP sample.

Original languageEnglish
Article number7917306
JournalIEEE Transactions on Magnetics
Volume53
Issue number11
DOIs
Publication statusPublished - Nov 2017

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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