Magnetism of gold nanorods probed using electron spin resonance

Y. Inagaki; H. Yonemura; N. Sakai; Y. Makihara; T. Kawae; S. Yamada

doi:10.1063/1.4961369

Magnetism of gold nanorods probed using electron spin resonance

Y. Inagaki, H. Yonemura, N. Sakai, Y. Makihara, T. Kawae, S. Yamada

Applied Physics

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

5 Citations (Scopus)

Abstract

Electron spin resonance (ESR) spectroscopy has been performed for gold nanorods (AuNRs) of four different sizes covered with a diamagnetic stabilizing component, cetyltrimethylammonium bromide. ESR signals were detected in AuNRs except the largest one. Two smallest AuNRs showed an abrupt change in the temperature dependence of resonance field and line width at around 60 K, indicating ferromagnetic phase transition. In medium-size AuNRs, the resonance with a large shift was observed below 100 K. The resonance field shifts at the lowest temperature exhibit systematic variation with the system size, which is explained by considering magnetic anisotropy for the ferromagnetic resonance.

Original language	English
Article number	072404
Journal	Applied Physics Letters
Volume	109
Issue number	7
DOIs	https://doi.org/10.1063/1.4961369
Publication status	Published - Aug 15 2016

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.4961369

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@article{7e7dfbf20e584a0693211ce3ac640505,

title = "Magnetism of gold nanorods probed using electron spin resonance",

abstract = "Electron spin resonance (ESR) spectroscopy has been performed for gold nanorods (AuNRs) of four different sizes covered with a diamagnetic stabilizing component, cetyltrimethylammonium bromide. ESR signals were detected in AuNRs except the largest one. Two smallest AuNRs showed an abrupt change in the temperature dependence of resonance field and line width at around 60 K, indicating ferromagnetic phase transition. In medium-size AuNRs, the resonance with a large shift was observed below 100 K. The resonance field shifts at the lowest temperature exhibit systematic variation with the system size, which is explained by considering magnetic anisotropy for the ferromagnetic resonance.",

author = "Y. Inagaki and H. Yonemura and N. Sakai and Y. Makihara and T. Kawae and S. Yamada",

note = "Funding Information: The authors are grateful to T. Asano and T. Sakurai for the help of ESR experiments. The authors thank Dr. Daigou Mizoguchi (Dai Nippon Toryo Co. Ltd.) for providing them with four different types of AuNRs and the Center of Advanced Instrumental Analysis, Kyushu University, for X-ray fluorescence, CHN elemental analyses, and the use of a TEM apparatus. This work was partially supported by a Grant-in-Aid for Scientific Research, Nos. 23540392, 25220605 and 25287076 Publisher Copyright: {\textcopyright} 2016 Author(s).",

year = "2016",

month = aug,

day = "15",

doi = "10.1063/1.4961369",

language = "English",

volume = "109",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

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TY - JOUR

T1 - Magnetism of gold nanorods probed using electron spin resonance

AU - Inagaki, Y.

AU - Yonemura, H.

AU - Sakai, N.

AU - Makihara, Y.

AU - Kawae, T.

AU - Yamada, S.

N1 - Funding Information: The authors are grateful to T. Asano and T. Sakurai for the help of ESR experiments. The authors thank Dr. Daigou Mizoguchi (Dai Nippon Toryo Co. Ltd.) for providing them with four different types of AuNRs and the Center of Advanced Instrumental Analysis, Kyushu University, for X-ray fluorescence, CHN elemental analyses, and the use of a TEM apparatus. This work was partially supported by a Grant-in-Aid for Scientific Research, Nos. 23540392, 25220605 and 25287076 Publisher Copyright: © 2016 Author(s).

PY - 2016/8/15

Y1 - 2016/8/15

N2 - Electron spin resonance (ESR) spectroscopy has been performed for gold nanorods (AuNRs) of four different sizes covered with a diamagnetic stabilizing component, cetyltrimethylammonium bromide. ESR signals were detected in AuNRs except the largest one. Two smallest AuNRs showed an abrupt change in the temperature dependence of resonance field and line width at around 60 K, indicating ferromagnetic phase transition. In medium-size AuNRs, the resonance with a large shift was observed below 100 K. The resonance field shifts at the lowest temperature exhibit systematic variation with the system size, which is explained by considering magnetic anisotropy for the ferromagnetic resonance.

AB - Electron spin resonance (ESR) spectroscopy has been performed for gold nanorods (AuNRs) of four different sizes covered with a diamagnetic stabilizing component, cetyltrimethylammonium bromide. ESR signals were detected in AuNRs except the largest one. Two smallest AuNRs showed an abrupt change in the temperature dependence of resonance field and line width at around 60 K, indicating ferromagnetic phase transition. In medium-size AuNRs, the resonance with a large shift was observed below 100 K. The resonance field shifts at the lowest temperature exhibit systematic variation with the system size, which is explained by considering magnetic anisotropy for the ferromagnetic resonance.

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U2 - 10.1063/1.4961369

DO - 10.1063/1.4961369

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SN - 0003-6951

VL - 109

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 7

M1 - 072404

ER -

Magnetism of gold nanorods probed using electron spin resonance

Abstract

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