Abstract
In the frame of the 20th Anniversary of the Journal of Nanoparticle Research (JNR), our aim is to start from the historical context 20 years ago and to give some recent results and perspectives concerning nanomagnets prepared from clusters preformed in the gas phase using the low-energy cluster beam deposition (LECBD) technique. In this paper, we focus our attention on the typical case of Co clusters embedded in various matrices to study interface magnetic anisotropy and magnetic interactions as a function of volume concentrations, and on still current and perspectives through two examples of binary metallic 3d-5d TM (namely CoPt and FeAu) cluster assemblies to illustrate size-related and nanoalloy phenomena on magnetic properties in well-defined mass-selected clusters. The structural and magnetic properties of these cluster assemblies were investigated using various experimental techniques that include high-resolution transmission electron microscopy (HRTEM), superconducting quantum interference device (SQUID) magnetometry, and synchrotron techniques such as extended X-ray absorption fine structure (EXAFS) and X-ray magnetic circular dichroism (XMCD). Depending on the chemical nature of both NPs and matrix, we observe different magnetic responses compared to their bulk counterparts. In particular, we show how finite size effects (size reduction) enhance their magnetic moment and how specific relaxation in nanoalloys can impact their magnetic anisotropy.
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Acknowledgements
All the clusters samples were prepared in the PLYRA platform, created in the frame of project agreement 1989-1993 between the French State and the Rhône-Alps Region, as a joint initiative of A. Perez, M. Broyer, and A. Renouprez from three laboratories of Lyon (LPMCN: Laboratoire de Physique de la Matière Condensée et Nanostructures – UMR UCBL-SPM CNRS No. 5586 - LASIM: Laboratoire de Spectrométrie Ionique et Moléculaire – UMR UCBL-SPM CNRS No. 5579 - IRCELYON: Institut de Recherche sur la Catalyse – UPR Chimie CNRS No. 5401). Many thanks to them and to the technical staff G. Guiraud, F. Valladier, and C. Clavier, startup responsibles of the building and development of the laser vaporization cluster machines at the Université Claude Bernard Lyon 1 (UCBL) but also to all the PhD students and post-doc researchers who have participated to the adventure. SQUID measurements were first performed at the Néel institute then at the CML platform created in 2008 at UCBL. The authors are also grateful to A. Ramos, H. Tolentino, M. de Santis, and O. Proux for their help during XRD and EXAFS experiments on the French CRG-D2AM and BM30b-FAME beamlines at ESRF, to S. Rusponi and H. Brune from EPFL for stimulating discussions, to J. Dreiser, C. Piamonteze, and F. Nolting from Swiss Light Source for their investment on the X-Treme beamline, to P. Ohresser from DEIMOS beam line SOLEIl synchrotron, and to K. Fauth from University of Wuerzburg for their help at BESSY II experiments, A. Rogalev and F. Wilhelm from the ESRF ID12 beamline for the XMCD measurements.
Funding
Support is acknowledged from the French National CNRS ACI, METSA network, GDR and ANR on clusters and Nanoalloys and from the European Community AMMARE contract no. G5RD-CT 2001-0047P, STREP SFINx, no. NMP2-CT-2003-505587, and COST-STSM-MP0903 on nanoalloys.
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Donald Tomalia, Paolo Milani and Kenneth Dawson, co-editors
This article is part of the topical collection: Unifying Concepts for Nanoscience and Nanosystems: 20th Anniversary Issue
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Dupuis, V., Hillion, A., Robert, A. et al. Bottom-up strategies for the assembling of magnetic systems using nanoclusters. J Nanopart Res 20, 128 (2018). https://doi.org/10.1007/s11051-018-4189-3
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DOI: https://doi.org/10.1007/s11051-018-4189-3