Ferromagnetism in bare gold nanoagglomerates produced by nanocluster deposition

Annika Venäläinen; Pasi Jalkanen; Vladimir Tuboltsev; Kristoffer Meinander; Alexander Savin; Jyrki Räisänen

doi:10.1016/j.jmmm.2018.01.041

Ferromagnetism in bare gold nanoagglomerates produced by nanocluster deposition

Annika Venäläinen^*, Pasi Jalkanen, Vladimir Tuboltsev, Kristoffer Meinander, Alexander Savin, Jyrki Räisänen

^*Corresponding author for this work

Department of Applied Physics

University of Helsinki

Research output: Contribution to journal › Article › Scientific › peer-review

7 Citations (Scopus)

Abstract

Recent research has shown unconventional magnetic properties in nanosized gold systems. These effects have mostly been detected in functionalized gold nanoparticles as well as in gold nanocrystalline films. We demonstrate ferro- and superparamagnetic behaviour in assemblies of bare gold nanoclusters. This is demonstrated by the characteristic ferromagnetic hysteresis with the temperature dependent saturation magnetization, remanence and coercivity in aggregates of small clusters. The detected magnetization is caused by the interaction between the separate clusters exhibiting an core-shell structure, and dependent on the total amount of gold confined in the samples. The behaviour is analogous to that of transition metal clusters.

Original language	English
Pages (from-to)	57-60
Number of pages	4
Journal	Journal of Magnetism and Magnetic Materials
Volume	454
DOIs	https://doi.org/10.1016/j.jmmm.2018.01.041
Publication status	Published - 15 May 2018
MoE publication type	A1 Journal article-refereed

Keywords

Au cluster deposition
Ferromagnetism
Nanoagglomerate
Superparamagnetism

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10.1016/j.jmmm.2018.01.041

http://hdl.handle.net/10138/312427 Licence: CC BY-NC-ND

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abstract = "Recent research has shown unconventional magnetic properties in nanosized gold systems. These effects have mostly been detected in functionalized gold nanoparticles as well as in gold nanocrystalline films. We demonstrate ferro- and superparamagnetic behaviour in assemblies of bare gold nanoclusters. This is demonstrated by the characteristic ferromagnetic hysteresis with the temperature dependent saturation magnetization, remanence and coercivity in aggregates of small clusters. The detected magnetization is caused by the interaction between the separate clusters exhibiting an core-shell structure, and dependent on the total amount of gold confined in the samples. The behaviour is analogous to that of transition metal clusters.",

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AU - Venäläinen, Annika

AU - Jalkanen, Pasi

AU - Tuboltsev, Vladimir

AU - Meinander, Kristoffer

AU - Savin, Alexander

AU - Räisänen, Jyrki

PY - 2018/5/15

Y1 - 2018/5/15

N2 - Recent research has shown unconventional magnetic properties in nanosized gold systems. These effects have mostly been detected in functionalized gold nanoparticles as well as in gold nanocrystalline films. We demonstrate ferro- and superparamagnetic behaviour in assemblies of bare gold nanoclusters. This is demonstrated by the characteristic ferromagnetic hysteresis with the temperature dependent saturation magnetization, remanence and coercivity in aggregates of small clusters. The detected magnetization is caused by the interaction between the separate clusters exhibiting an core-shell structure, and dependent on the total amount of gold confined in the samples. The behaviour is analogous to that of transition metal clusters.

AB - Recent research has shown unconventional magnetic properties in nanosized gold systems. These effects have mostly been detected in functionalized gold nanoparticles as well as in gold nanocrystalline films. We demonstrate ferro- and superparamagnetic behaviour in assemblies of bare gold nanoclusters. This is demonstrated by the characteristic ferromagnetic hysteresis with the temperature dependent saturation magnetization, remanence and coercivity in aggregates of small clusters. The detected magnetization is caused by the interaction between the separate clusters exhibiting an core-shell structure, and dependent on the total amount of gold confined in the samples. The behaviour is analogous to that of transition metal clusters.

KW - Au cluster deposition

KW - Ferromagnetism

KW - Nanoagglomerate

KW - Superparamagnetism

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JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

ER -

Ferromagnetism in bare gold nanoagglomerates produced by nanocluster deposition

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Keywords

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