To increase the superparamagnetic blocking frequency, we propose magnetic nanoparticles with negative uniaxial magnetocrystalline anisotropy, K u grain . Using this material, both high ferromagnetic resonance frequency, f r , and low magnetic potential height, ΔE, can be satisfied simultaneously. Thus, f b can be greatly improved. From the results of DC magnetization. process of highly oriented h.c.p. C083Ir 17 nanogranular with negative K u grain , it is verified that the nanoparticles with negative K u grain have superparamagnetic properties only in the c-plane.
- Blocking frequency
- h.c.p. Co-Ir
- negative uniaxial anisotropy
- superparamagnetic nanoparticles
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering