单个钴纳米团簇的磁各向异性

Magnetic anisotropy of a single cobalt nanocluster.

作者信息

Jamet M, Wernsdorfer W, Thirion C, Mailly D, Dupuis V, Mélinon P, Pérez A

机构信息

DPM-Université Claude Bernard-Lyon 1 et CNRS, 69622 Villeurbanne, France.

出版信息

Phys Rev Lett. 2001 May 14;86(20):4676-9. doi: 10.1103/PhysRevLett.86.4676.

DOI:10.1103/PhysRevLett.86.4676

PMID:11384312

Abstract

Using a new micro-SQUID setup, we investigate magnetic anisotropy in a single 1000-atom cobalt cluster. This system opens new fields in the characterization and understanding of the origin of magnetic anisotropy in such nanoparticles. For this purpose, we report three-dimensional switching field measurements performed on a 3 nm cobalt cluster embedded in a niobium matrix. We are able to separate the different magnetic anisotropy contributions and evidence the dominating role of the cluster surface.

摘要

使用一种新的微型超导量子干涉装置，我们研究了单个1000原子钴簇中的磁各向异性。该系统为表征和理解此类纳米颗粒中磁各向异性的起源开辟了新领域。为此，我们报告了对嵌入铌基质中的3纳米钴簇进行的三维开关场测量。我们能够分离出不同的磁各向异性贡献，并证明簇表面的主导作用。