Direct observation of ferromagnetic spin polarization in gold nanoparticles

Y. Yamamoto; T. Miura; M. Suzuki; N. Kawamura; H. Miyagawa; T. Nakamura; K. Kobayashi; T. Teranishi; H. Hori

doi:10.1103/PhysRevLett.93.116801

Direct observation of ferromagnetic spin polarization in gold nanoparticles

Y. Yamamoto, T. Miura, M. Suzuki, N. Kawamura, H. Miyagawa, T. Nakamura, K. Kobayashi, T. Teranishi, H. Hori

International Center for Synchrotron Radiation Innovation Smart (SRIS)

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

304 Citations (Scopus)

Abstract

The observation of ferromagnetic spin polarization of Au nanoparticles with a mean diameter of 1.9 nm using magnetic circular dichroism (XMCD) was presented. The gold magnetization was explored, owing to the element selectivity of XMCD. It was observed that the magnetization of gold atoms, estimated by XMCD, shows a good agreement with results obtained by conventional magnetometry. It was found that the magnetization of Au nanoparticles consist of a superparamagnetic part obeying the Curie law and a temperature-independent Pauli-paramagnetic part, suggested by the external magnetic field and temperature dependence of the element-specific magnetization (ESM) signal.

Original language	English
Article number	116801
Pages (from-to)	116801-1-116801-4
Journal	Physical Review Letters
Volume	93
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevLett.93.116801
Publication status	Published - 2004 Sept 10

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10.1103/PhysRevLett.93.116801

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title = "Direct observation of ferromagnetic spin polarization in gold nanoparticles",

abstract = "The observation of ferromagnetic spin polarization of Au nanoparticles with a mean diameter of 1.9 nm using magnetic circular dichroism (XMCD) was presented. The gold magnetization was explored, owing to the element selectivity of XMCD. It was observed that the magnetization of gold atoms, estimated by XMCD, shows a good agreement with results obtained by conventional magnetometry. It was found that the magnetization of Au nanoparticles consist of a superparamagnetic part obeying the Curie law and a temperature-independent Pauli-paramagnetic part, suggested by the external magnetic field and temperature dependence of the element-specific magnetization (ESM) signal.",

author = "Y. Yamamoto and T. Miura and M. Suzuki and N. Kawamura and H. Miyagawa and T. Nakamura and K. Kobayashi and T. Teranishi and H. Hori",

note = "Funding Information: The synchrotron radiation experiments were performed at SPring-8 with the approval of Japan Synchrotron Radiation Research Institute (JASRI) as Nanotechnology Support Project of The Ministry of Education, Culture, Sports, Science, and Technology (Proposal No. 2002B0380-NS2-np/BL-No. 39XU).",

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doi = "10.1103/PhysRevLett.93.116801",

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T1 - Direct observation of ferromagnetic spin polarization in gold nanoparticles

AU - Yamamoto, Y.

AU - Miura, T.

AU - Suzuki, M.

AU - Kawamura, N.

AU - Miyagawa, H.

AU - Nakamura, T.

AU - Kobayashi, K.

AU - Teranishi, T.

AU - Hori, H.

N1 - Funding Information: The synchrotron radiation experiments were performed at SPring-8 with the approval of Japan Synchrotron Radiation Research Institute (JASRI) as Nanotechnology Support Project of The Ministry of Education, Culture, Sports, Science, and Technology (Proposal No. 2002B0380-NS2-np/BL-No. 39XU).

PY - 2004/9/10

Y1 - 2004/9/10

N2 - The observation of ferromagnetic spin polarization of Au nanoparticles with a mean diameter of 1.9 nm using magnetic circular dichroism (XMCD) was presented. The gold magnetization was explored, owing to the element selectivity of XMCD. It was observed that the magnetization of gold atoms, estimated by XMCD, shows a good agreement with results obtained by conventional magnetometry. It was found that the magnetization of Au nanoparticles consist of a superparamagnetic part obeying the Curie law and a temperature-independent Pauli-paramagnetic part, suggested by the external magnetic field and temperature dependence of the element-specific magnetization (ESM) signal.

AB - The observation of ferromagnetic spin polarization of Au nanoparticles with a mean diameter of 1.9 nm using magnetic circular dichroism (XMCD) was presented. The gold magnetization was explored, owing to the element selectivity of XMCD. It was observed that the magnetization of gold atoms, estimated by XMCD, shows a good agreement with results obtained by conventional magnetometry. It was found that the magnetization of Au nanoparticles consist of a superparamagnetic part obeying the Curie law and a temperature-independent Pauli-paramagnetic part, suggested by the external magnetic field and temperature dependence of the element-specific magnetization (ESM) signal.

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JO - Physical Review Letters

JF - Physical Review Letters

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Direct observation of ferromagnetic spin polarization in gold nanoparticles

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