To increase the superparamagnetic blocking frequency, we propose magnetic nanoparticles with negative uniaxial magnetocrystalline anisotropy, Kugrain. Using this material, both high ferromagnetic resonance frequency, fr, and low magnetic potential height, ΔE, can be satisfied simultaneously. Thus, fbcan be greatly improved. From the results of DC magnetization. process of highly oriented h.c.p. C083Ir17nanogranular with negative Kugrain, it is verified that the nanoparticles with negative Kugrainhave superparamagnetic properties only in the c-plane.
- Blocking frequency
- h.c.p. Co-Ir
- negative uniaxial anisotropy
- superparamagnetic nanoparticles