Trusov Lev A, Sleptsova Anastasia E, Duan Jingtong, Gorbachev Evgeny A, Kozlyakova Ekaterina S, Anokhin Evgeny O, Eliseev Artem A, Karpov Maxim A, Vasiliev Alexander V, Brylev Oleg A, Kazin Pavel E
Faculty of Materials Science, MSU-BIT University, Shenzhen 517182, China.
Faculty of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia.
Nanomaterials (Basel). 2021 Apr 5;11(4):924. doi: 10.3390/nano11040924.
Magnetically hard ferrites attract considerable interest due to their ability to maintain a high coercivity of nanosized particles and therefore show promising applications as nanomagnets ranging from magnetic recording to biomedicine. Herein, we report an approach to prepare nonsintered single-domain nanoparticles of chromium-substituted hexaferrite via crystallization of glass in the system SrO-FeO-CrO-BO. We have observed a formation of plate-like hexaferrite nanoparticles with diameters changing from 20 to 190 nm depending on the annealing temperature. We demonstrated that chromium substitution led to a significant improvement of the coercivity, which varied from 334 to 732 kA m for the smallest and the largest particles, respectively. The results provide a new strategy for producing high-coercivity ferrite nanomagnets.
硬磁铁氧体因其能够保持纳米级颗粒的高矫顽力而备受关注，因此作为从磁记录到生物医学等领域的纳米磁体显示出广阔的应用前景。在此，我们报道了一种通过在SrO-FeO-CrO-BO系统中玻璃结晶来制备铬取代六铁氧体的非烧结单畴纳米颗粒的方法。我们观察到形成了板状六铁氧体纳米颗粒，其直径根据退火温度在20至190nm之间变化。我们证明，铬取代导致矫顽力显著提高，最小和最大颗粒的矫顽力分别在334至732kA/m之间变化。这些结果为生产高矫顽力铁氧体纳米磁体提供了一种新策略。
