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在fcc(111)金属表面生长的双金属纳米岛中增强磁各向异性。

Increasing Magnetic Anisotropy in Bimetallic Nanoislands Grown on fcc(111) Metal Surfaces.

作者信息

Vlaic Sergio, Mousadakos Dimitris, Ouazi Safia, Rusponi Stefano, Brune Harald

机构信息

Institute of Physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.

Laboratoire de Physique et d'Étude des Matériaux (LPEM), ESPCI Paris-PSL Universtity, CNRS UMR8213, Sorbonne Université, 75005 Paris, France.

出版信息

Nanomaterials (Basel). 2022 Feb 2;12(3):518. doi: 10.3390/nano12030518.

DOI:10.3390/nano12030518
PMID:35159863
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8840744/
Abstract

The magnetic properties and the atomic scale morphology of bimetallic two-dimensional nanoislands, epitaxially grown on fcc(111) metal surfaces, have been studied by means of Magneto-Optical Kerr Effect and Scanning Tunneling Microscopy. We investigate the effect on blocking temperature of one-dimensional interlines appearing in core-shell structures, of two-dimensional interfaces created by capping, and of random alloying. The islands are grown on Pt(111) and contain a Co-core, surrounded by Ag, Rh, and Pd shells, or capped by Pd. The largest effect is obtained by Pd capping, increasing the blocking temperature by a factor of three compared to pure Co islands. In addition, for Co-core Fe-shell and Co-core FeCo-shell islands, self-assembled into well ordered superlattices on Au(11,12,12) vicinal surfaces, we find a strong enhancement of the blocking temperature compared to pure Co islands of the same size. These ultra-high-density (15 Tdots/in) superlattices of CoFe nanodots, only 500 atoms in size, have blocking temperature exceeding 100 K. Our findings open new possibilities to tailor the magnetic properties of nanoislands.

摘要

通过磁光克尔效应和扫描隧道显微镜，研究了在fcc(111)金属表面外延生长的双金属二维纳米岛的磁性和原子尺度形态。我们研究了核壳结构中出现的一维连接线、由盖帽形成的二维界面以及随机合金化对阻塞温度的影响。这些纳米岛生长在Pt(111)上，包含一个Co核，周围是Ag、Rh和Pd壳，或者由Pd盖帽。最大的影响是由Pd盖帽获得的，与纯Co岛相比，阻塞温度提高了三倍。此外，对于在Au(11,12,12)近邻表面自组装成有序超晶格的Co核Fe壳和Co核FeCo壳纳米岛，我们发现与相同尺寸的纯Co岛相比，阻塞温度有显著提高。这些仅500个原子大小的CoFe纳米点的超高密度(15 Tdots/in)超晶格，阻塞温度超过100 K。我们的发现为定制纳米岛的磁性开辟了新的可能性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa36/8840744/5d26bc01149f/nanomaterials-12-00518-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa36/8840744/4576fe094a0f/nanomaterials-12-00518-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa36/8840744/e96114c5b297/nanomaterials-12-00518-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa36/8840744/e1ca5a0a9b85/nanomaterials-12-00518-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa36/8840744/d19530b5907f/nanomaterials-12-00518-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa36/8840744/3014e73a3405/nanomaterials-12-00518-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa36/8840744/770937add11d/nanomaterials-12-00518-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa36/8840744/5d26bc01149f/nanomaterials-12-00518-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa36/8840744/4576fe094a0f/nanomaterials-12-00518-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa36/8840744/e96114c5b297/nanomaterials-12-00518-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa36/8840744/e1ca5a0a9b85/nanomaterials-12-00518-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa36/8840744/d19530b5907f/nanomaterials-12-00518-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa36/8840744/3014e73a3405/nanomaterials-12-00518-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa36/8840744/770937add11d/nanomaterials-12-00518-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa36/8840744/5d26bc01149f/nanomaterials-12-00518-g007.jpg

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