Magnetic and resonance properties of ferrihydrite nanoparticles doped with cobalt |
| |
| Authors: | S. V. Stolyar R. N. Yaroslavtsev R. S. Iskhakov O. A. Bayukov D. A. Balaev A. A. Dubrovskii A. A. Krasikov V. P. Ladygina A. M. Vorotynov M. N. Volochaev |
| |
| Affiliation: | 1.Siberian Federal University,Krasnoyarsk,Russia;2.Kirensky Institute of Physics, Siberian Branch,Russian Academy of Sciences,Krasnoyarsk,Russia;3.International Scientific Center for Organism Extreme States Research at the Presidium of the Krasnoyarsk Scientific Center, Siberian Branch,Russian Academy of Sciences,Krasnoyarsk,Russia |
| |
| Abstract: | Powders of undoped ferrihydrite nanoparticles and ferrihydrite nanoparticles doped with cobalt in the ratio of 5: 1 have been prepared by hydrolysis of 3d-metal salts. It has been shown using Mössbauer spectroscopy that cobalt is uniformly distributed over characteristic crystal-chemical positions of iron ions. The blocking temperatures of ferrihydrite nanoparticles have been determined. The nanoparticle sizes, magnetizations, surface anisotropy constants, and bulk anisotropy constants have been estimated. The doping of ferrihydrite nanoparticles with cobalt leads to a significant increase in the anisotropy constant of a nanoparticle and to the formation of surface rotational anisotropy with the surface anisotropy constant K u = 1.6 × 10–3 erg/cm2. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
