Substantial enhancement in intrinsic coercivity on M-type strontium hexaferrite through the increase in magneto-crystalline anisotropy by co-doping of group-V and alkali elements
Substantial enhancement in intrinsic coercivity on M-type strontium hexaferrite through the increase in magneto-crystalline anisotropy by co-doping of group-V and alkali elements
复制标题
通过共掺杂V族和碱金属元素增加磁晶各向异性，显着增强M型锶六方铁氧体的内禀矫顽力
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Young Jae Kang
中科院分区：
文献类型：
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作者：
K. Ahn;B. Ryu;D. Korolev;Young Jae Kang
研究了d1杂质掺杂对锶铁氧体磁各向异性的影响。第一性原理计算表明，V族元素（V，Nb）的稳定与共掺杂的碱金属元素。Sr ~（2+）位的Na ~（1+）/K ~（1+）掺杂对Fe位d1杂质的形成起着关键作用。实验上，Na-V掺杂的SrM显示出约5.4kOe的本征介电常数，与未掺杂的SrM相比提高了约300%，与La-Co共掺杂的SrM相当。最后，SrM中d1杂质的非零角动量引起的自旋-轨道耦合是导致本征双折射率显著提高的主要因素。
The effect of d1 impurity doping in Sr-hexaferrite (SrM) on the magnetic anisotropy is investigated. First-principles calculations revealed that group-V elements (V, Nb) are stabilized with co-doping of alkali elements. Na1+/K1+ doping at Sr2+-site is found to be critical to form the d1 impurities at Fe-site. Experimentally, Na–V doped SrM shows the intrinsic coercivity of ∼5.4 kOe, which is ∼300% enhancement compared to undoped SrM and comparable value to La–Co co-doped SrM. Finally, the spin-orbit coupling from non-vanishing angular momentum of d1 impurity in SrM should be a main factor for such a substantial improvement of intrinsic coercivity.