Hard ferrite magnetic insulators revealing giant coercivity and sub-terahertz natural ferromagnetic resonance at 5-300 K

被引：12
作者：
Gorbachev, Evgeny A. [1 ]
Kozlyakova, Ekaterina S. [2 ]
Alyabyeva, Liudmila N. [3 ]
Ahmed, Asmaa [3 ]
Trusov, Lev A. [1 ,4 ]
机构：
[1] Lomonosov Moscow State Univ, Dept Chem, Moscow 119991, Russia
[2] Lomonosov Moscow State Univ, Dept Phys, Moscow 119991, Russia
[3] Moscow Inst Phys & Technol, Ctr Photon & 2D Mat, Lab Terahertz Spect, Dolgoprudnyi 171701, Russia
[4] Shenzhen MSU BIT Univ, Dept Mat Sci, Shenzhen 518172, Peoples R China
来源：
MATERIALS HORIZONS | 2023年 / 10卷 / 05期
基金：
俄罗斯科学基金会;
关键词：
EPSILON-FE2O3; FIELD; NANOPARTICLES; TAPE;
D O I：
10.1039/d3mh00089c
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The temperature behavior of the magnetic properties is crucial for the application of magnetic materials. Recently, giant room temperature coercivities (20-36 kOe) and sub-terahertz natural ferromagnetic resonance (NFMR) frequencies (160-250 GHz) were observed for single-domain M-type hexaferrites with high aluminum substitution. Herein, the temperature dependences of the magnetic properties and natural ferromagnetic resonance are studied at 5-300 K for single-domain Sr1-x/12Cax/12Fe12-xAlxO19 (x = 1.5-5.5) particles. It is shown that the samples maintain their magnetic hardness over the whole temperature range. The coercivity and NFMR frequencies have a maximum shifting to the low-temperature region with a rise in aluminum concentration. The highest coercivity of 42 kOe and the maximum NFMR frequency of 297 GHz are observed for x = 5.5 at 180 K.
引用
收藏
页码：1842 / 1847
页数：6
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