Harmonic response of Gd-doped Mn-ferrite nanoparticles under AC magnetic field and optimization of Gd doping for MPI applications
T. Sakamoto,
K. Nii,
Y. Fujita,
T. Moriwaki,
H. Amano,
R. Abe,
Y. Ichiyanagi
Affiliations
T. Sakamoto
Department of Physics, Graduate School of Engineering Science, Yokohama National University, Yokohama, Kanagawa 240-8501, Japan
K. Nii
Department of Physics, Graduate School of Engineering Science, Yokohama National University, Yokohama, Kanagawa 240-8501, Japan
Y. Fujita
Department of Physics, Graduate School of Engineering Science, Yokohama National University, Yokohama, Kanagawa 240-8501, Japan
T. Moriwaki
Department of National Environment, Graduate School of Environment and Information Science, Yokohama National University, Yokohama, Kanagawa 240-8501, Japan
H. Amano
Department of Physics, Graduate School of Engineering Science, Yokohama National University, Yokohama, Kanagawa 240-8501, Japan
R. Abe
Department of Physics, Graduate School of Engineering Science, Yokohama National University, Yokohama, Kanagawa 240-8501, Japan
Y. Ichiyanagi
Department of Physics, Graduate School of Engineering Science, Yokohama National University, Yokohama, Kanagawa 240-8501, Japan
This study synthesized Gd-doped Mn-ferrite nanoparticles for magnetic particle imaging (MPI) applications with doping levels (x) of 0, 0.05, 0.07, and 0.10. Analyses using X-ray diffraction measurements unequivocally confirmed the presence of a spinel-type crystal structure in the synthesized particles and X-ray absorption fine-structure spectroscopy confirmed the incorporation of Gd atoms in place of Mn within the crystal lattice. Magnetization and harmonic measurements under an AC magnetic field revealed that particles with a high initial permeability and low coercivity showed a high response intensity. Notably, particles possessing a Gd doping level of x = 0.07 displayed the highest response and were considered promising as MPI materials.
