Investigation of Magnetic Properties of Ni-B Nanotubes at Low Temperatures

F. M.F. Rhen, D. Richardson, C. A.D. Pomar, J. A. Souza

Research output: Contribution to journalArticlepeer-review

Abstract

We have investigated the magnetic properties of Ni1-xBx nanotubes as a function of composition, temperature, and magnetic fields. The nanotubes were prepared by electroless deposition in polycarbonate membranes using dimethylamine borane as a reducing agent. The nanotube arrays are formed with a length of 20 μm, an outer diameter of 400 nm, and an inner diameter of 110 nm. The composition, x = 12, 20, 27, and 35, was varied by controlling the pH during the preparation process. A range of low temperature magnetic measurements show both superparamagnetic and ferromagnetic behaviors. The saturation magnetization dependence on temperature cannot be directly represented by Bloch's law. However, we introduce a modified relationship taking into account Bloch's law and Langevin's equation to fit the experimental data from 2 to 380 K for samples with 27 at.% of B. Good agreement between the model and data is observed for this composition. The mathematical model is the summation of superparamagnetism and ferromagnetism.

Original languageEnglish
Article number7372450
JournalIEEE Transactions on Magnetics
Volume52
Issue number5
DOIs
Publication statusPublished - May 2016

Keywords

  • Electroless Deposition
  • low temperature Ni-B nanotubes
  • nanotubes
  • Specific Magnetization

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