Magnetic order of Au nanoparticle with clean surface

Ryuju Sato; Soichiro Ishikawa; Hiroyuki Sato; Tetsuya Sato

doi:10.1016/j.jmmm.2015.05.072

Magnetic order of Au nanoparticle with clean surface

Ryuju Sato, Soichiro Ishikawa, Hiroyuki Sato, Tetsuya Sato

Department of Applied Physics and Physico-Informatics

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

3 Citations (Scopus)

Abstract

Au nanoparticles, which are kept in vacuum after the preparation by gas evaporation method, show ferromagnetism even in 1.7 nm in diameter. The intrinsic magnetism is examined by detecting the disappearance of spontaneous magnetization in Au bulk prepared by heating the nanoparticles without exposure to the air. The temperature dependence of spontaneous magnetization is not monotonic and the increase in magnetization is observed after Au nanoparticles are exposed to the air. The magnetic behavior can be interpreted by the ferrimagnetic-like core-shell structure with shell thickness of 0.16±0.01 nm and magnetic moment of (1.5±0.1)×10^-2 μ_B/Au atom, respectively.

Original language	English
Pages (from-to)	209-212
Number of pages	4
Journal	Journal of Magnetism and Magnetic Materials
Volume	393
DOIs	https://doi.org/10.1016/j.jmmm.2015.05.072
Publication status	Published - 2015 Jun 4

Keywords

Au nanoparticle
Ferromagnetism
Gas evaporation method

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Magnetic order of Au nanoparticle with clean surface",

abstract = "Au nanoparticles, which are kept in vacuum after the preparation by gas evaporation method, show ferromagnetism even in 1.7 nm in diameter. The intrinsic magnetism is examined by detecting the disappearance of spontaneous magnetization in Au bulk prepared by heating the nanoparticles without exposure to the air. The temperature dependence of spontaneous magnetization is not monotonic and the increase in magnetization is observed after Au nanoparticles are exposed to the air. The magnetic behavior can be interpreted by the ferrimagnetic-like core-shell structure with shell thickness of 0.16±0.01 nm and magnetic moment of (1.5±0.1)×10-2 μB/Au atom, respectively.",

keywords = "Au nanoparticle, Ferromagnetism, Gas evaporation method",

author = "Ryuju Sato and Soichiro Ishikawa and Hiroyuki Sato and Tetsuya Sato",

year = "2015",

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day = "4",

doi = "10.1016/j.jmmm.2015.05.072",

language = "English",

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journal = "Journal of Magnetism and Magnetic Materials",

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TY - JOUR

T1 - Magnetic order of Au nanoparticle with clean surface

AU - Sato, Ryuju

AU - Ishikawa, Soichiro

AU - Sato, Hiroyuki

AU - Sato, Tetsuya

PY - 2015/6/4

Y1 - 2015/6/4

N2 - Au nanoparticles, which are kept in vacuum after the preparation by gas evaporation method, show ferromagnetism even in 1.7 nm in diameter. The intrinsic magnetism is examined by detecting the disappearance of spontaneous magnetization in Au bulk prepared by heating the nanoparticles without exposure to the air. The temperature dependence of spontaneous magnetization is not monotonic and the increase in magnetization is observed after Au nanoparticles are exposed to the air. The magnetic behavior can be interpreted by the ferrimagnetic-like core-shell structure with shell thickness of 0.16±0.01 nm and magnetic moment of (1.5±0.1)×10-2 μB/Au atom, respectively.

AB - Au nanoparticles, which are kept in vacuum after the preparation by gas evaporation method, show ferromagnetism even in 1.7 nm in diameter. The intrinsic magnetism is examined by detecting the disappearance of spontaneous magnetization in Au bulk prepared by heating the nanoparticles without exposure to the air. The temperature dependence of spontaneous magnetization is not monotonic and the increase in magnetization is observed after Au nanoparticles are exposed to the air. The magnetic behavior can be interpreted by the ferrimagnetic-like core-shell structure with shell thickness of 0.16±0.01 nm and magnetic moment of (1.5±0.1)×10-2 μB/Au atom, respectively.

KW - Au nanoparticle

KW - Ferromagnetism

KW - Gas evaporation method

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