TY - JOUR
T1 - Investigation of Magnetic Properties of Ni-B Nanotubes at Low Temperatures
AU - Rhen, F. M.F.
AU - Richardson, D.
AU - Pomar, C. A.D.
AU - Souza, J. A.
N1 - Publisher Copyright:
© 2016 IEEE.
PY - 2016/5
Y1 - 2016/5
N2 - 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.
AB - 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.
KW - Electroless Deposition
KW - low temperature Ni-B nanotubes
KW - nanotubes
KW - Specific Magnetization
UR - http://www.scopus.com/inward/record.url?scp=84964434712&partnerID=8YFLogxK
U2 - 10.1109/TMAG.2015.2511884
DO - 10.1109/TMAG.2015.2511884
M3 - Article
AN - SCOPUS:84964434712
SN - 0018-9464
VL - 52
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 5
M1 - 7372450
ER -