原子空位和第二邻反铁磁交换耦合在铁磁纳米粒子中的作用

IF 2.8 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Applied Physics A Pub Date : 2025-02-04 DOI:10.1007/s00339-025-08265-9

Harun Al Rashid, Muskan Sharma, Shruti, Dheeraj Kumar Singh

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引用次数: 0

摘要

磁性纳米粒子的无序和受挫可能有几个因素，包括表面和内部的原子空位、杂质原子、远程磁交换耦合等。我们在Heisenberg模型中使用蒙特卡罗模拟来检验随机分布的原子空位和远程磁交换耦合对铁磁性纳米颗粒的温度依赖性磁性能的作用。特别地，我们研究了第二近邻反铁磁交换耦合和粒子内部缺失原子的作用，导致附近键断裂。我们发现这两个因素都可以增强这种粒子的超顺磁性行为。

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Role of atomic vacancies and second-neighbor antiferromagnetic-exchange coupling in a ferromagnetic nanoparticle

Several factors may be responsible for disorder and frustration in a magnetic nanoparticle, including atomic vacancies on the surface and inside, impurity atoms, long-range magnetic exchange coupling, etc. We use Monte-Carlo simulations within the Heisenberg model to examine the role of randomly distributed atomic vacancies and long-range magnetic-exchange coupling on the temperature-dependent magnetic properties of ferromagnetic nanoparticles. In particular, we study the role of the second-neighbor antiferromagnetic exchange coupling and missing atoms inside the particle, resulting in broken nearby bonds. We find that both factors may enhance the superparamagnetic behaviors of such particles.

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来源期刊

Applied Physics A 工程技术-材料科学：综合

CiteScore

4.80

自引率

7.40%

发文量

964

审稿时长

38 days

期刊介绍： Applied Physics A publishes experimental and theoretical investigations in applied physics as regular articles, rapid communications, and invited papers. The distinguished 30-member Board of Editors reflects the interdisciplinary approach of the journal and ensures the highest quality of peer review.