4.6 Article

Estimation of the effective magnetic anisotropy constant of multi-core based magnetic nanoparticles from the temperature dependence of the coercive field

Journal

JOURNAL OF APPLIED PHYSICS
Volume 127, Issue 13, Pages -

Publisher

AMER INST PHYSICS
DOI: 10.1063/1.5144713

Keywords

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Funding

  1. Japan Society for the Promotion of Science [JP15H05764, JP18K04170, JP18F18349]
  2. German Research Foundation (DFG) [ZH 782/1-1, SPP1681, VI 892/1-1, LU 800/4-3]
  3. Lower Saxony Ministry for Science and Culture (MWK) via Niedersachsisches Vorab through Quantum-and Nano-Metrology (QUANOMET) initiative
  4. Braunschweig International Graduate School of Metrology (B-IGSM)
  5. DFG Research Training Group 1952 Metrology for Complex Nanosystems
  6. Laboratory for Emerging Nanometrology (LENA)

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We estimated the effective magnetic anisotropy constant K of magnetic nanoparticles (MNPs) from the temperature dependence of the coercive field H-c of the M-H curve for use in biosensing applications. For this purpose, a previous analytical expression for H-c was extended so that it can be applied to nanoparticles with a size distribution. Using the extended expression for H-c, we estimated the K value of multi-core based MNP sample that consists of crystalline aggregates of elementary particles. We prepared three MNP samples. One is Resovist, in which elementary particles and aggregates are mixed. The Resovist sample was magnetically divided into two fractions called MS1 and MS3, which included mainly aggregates and elementary particles, respectively. We discuss the K value of elementary particles and aggregates from the comparison among the three samples. It is suggested that the K value of the aggregates is much smaller than that of the elementary particles. The temperature dependence of K of the aggregates is also discussed.

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