Exploring magnetic disorder in inverted core-shell nanoparticles: the role of surface anisotropy and core/shell coupling.

IF 2.3 4区 物理与天体物理 Q3 PHYSICS, CONDENSED MATTER
Dámaso Ccahuana, Emilio De Biasi
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Abstract

In this work, we have studied the effect of internal coupling in magnetic nanoparticles with inverted core-shell structure (antiferromagnet-ferrimagnet) and also magnetic surface anisotropy, performing Monte Carlo simulations based on a micromagnetic model applied in the limit of lattice size equal to the crystalline unit cell. In the treatment, different internal regions of the particle were labeled in order to analyze the magnetic order and the degree of coupling between them. The results obtained are in agreement with experimental observations in CoO/CoFe2O4and ZnO/CoFe2O systems, which we have taken as reference. It is observed that the surface anisotropy decreases the coercive field and the blocking temperature of the system. However, the core/shell coupling improves these properties and magnetically hardens the system. Our study shows that a significant magnetic stress is generated in the system, leading to magnetic disorder in the spins of the particle interface. On the other hand, in cases of high surface anisotropy, within a range of interfacial exchange values, a clear magnetic disorder is observed in the shell, which leads to anomalous behavior because the magnetization reversal process is no longer coherent.

探索倒核壳纳米粒子中的磁紊乱:表面各向异性和核/壳耦合的作用
在这项工作中,我们研究了具有倒核壳结构(反铁磁体-铁磁体)的磁性纳米粒子的内部耦合效应,以及磁性表面各向异性,根据微磁模型在晶格尺寸等于晶胞的极限条件下进行蒙特卡罗模拟。在处理过程中,对粒子的不同内部区域进行了标记,以分析它们之间的磁序和耦合度。所获得的结果与 CoO/CoFe2O4 和 ZnO/CoFe2O 系统的实验观察结果一致。据观察,表面各向异性会降低系统的矫顽力场和阻塞温度。然而,核/壳耦合改善了这些特性,并使系统磁性更强。我们的研究表明,系统中会产生巨大的磁应力,导致粒子界面自旋的磁紊乱。另一方面,在表面各向异性较高的情况下,在一定的界面交换值范围内,会在壳中观察到明显的磁紊乱,这将导致异常行为,因为磁化反转过程不再具有连贯性。
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来源期刊
Journal of Physics: Condensed Matter
Journal of Physics: Condensed Matter 物理-物理:凝聚态物理
CiteScore
5.30
自引率
7.40%
发文量
1288
审稿时长
2.1 months
期刊介绍: Journal of Physics: Condensed Matter covers the whole of condensed matter physics including soft condensed matter and nanostructures. Papers may report experimental, theoretical and simulation studies. Note that papers must contain fundamental condensed matter science: papers reporting methods of materials preparation or properties of materials without novel condensed matter content will not be accepted.
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