Magnetization-induced optical second harmonic generation from the surface of Co-doped rutile TiO2(110)

R. Watanabe; M. Yuasa; Y. Yahata; G. Mizutani; T. Suzuki; Y. Segawa; Y. Matsumoto; Y. Yamamoto; H. Koinuma

doi:10.1002/sia.2907

Magnetization-induced optical second harmonic generation from the surface of Co-doped rutile TiO₂(110)

R. Watanabe, M. Yuasa, Y. Yahata, G. Mizutani, T. Suzuki, Y. Segawa, Y. Matsumoto, Y. Yamamoto, H. Koinuma

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

1 Citation (Scopus)

Abstract

We have investigated the surface magnetism of 5 at% Co-doped rutile TiO₂(110) using magnetization-induced optical second harmonic generation (MSHG) in the longitudinal Kerr configuration with the incident beam angle of 4°. MSHG is observed at both 2hℏω = 2.33 eV and 2hℏω = 4.20 eV. MSH intensity showed a hysteresis as a function of the external magnetic field for the second harmonic photon energy of 2ℏω = 4.20 eV at which the absorption length limits the MSHG origin to the surface layer of 10 nm due to the TiO₂ bulk. Since 5 at% Co: TiO₂(110) is judged to have no metallic Co near the top surface by XPS, the hysteresis is attributed to a carrier-induced ferromagnetism at the surface of this material.

Original language	English
Pages (from-to)	1692-1695
Number of pages	4
Journal	Surface and Interface Analysis
Volume	40
Issue number	13
DOIs	https://doi.org/10.1002/sia.2907
Publication status	Published - 2008 Dec
Externally published	Yes

Keywords

Co/rutile TiO
Dilute magnetic semiconductors
Hysteresis
Magnetization-induced optical second harmonic generation (MSHG)
Surface magnetization

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

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@article{196b7027728045c7806537a9c1e876ee,

title = "Magnetization-induced optical second harmonic generation from the surface of Co-doped rutile TiO2(110)",

abstract = "We have investigated the surface magnetism of 5 at% Co-doped rutile TiO2(110) using magnetization-induced optical second harmonic generation (MSHG) in the longitudinal Kerr configuration with the incident beam angle of 4°. MSHG is observed at both 2hℏω = 2.33 eV and 2hℏω = 4.20 eV. MSH intensity showed a hysteresis as a function of the external magnetic field for the second harmonic photon energy of 2ℏω = 4.20 eV at which the absorption length limits the MSHG origin to the surface layer of 10 nm due to the TiO2 bulk. Since 5 at% Co: TiO2(110) is judged to have no metallic Co near the top surface by XPS, the hysteresis is attributed to a carrier-induced ferromagnetism at the surface of this material.",

keywords = "Co/rutile TiO, Dilute magnetic semiconductors, Hysteresis, Magnetization-induced optical second harmonic generation (MSHG), Surface magnetization",

author = "R. Watanabe and M. Yuasa and Y. Yahata and G. Mizutani and T. Suzuki and Y. Segawa and Y. Matsumoto and Y. Yamamoto and H. Koinuma",

year = "2008",

month = dec,

doi = "10.1002/sia.2907",

language = "English",

volume = "40",

pages = "1692--1695",

journal = "Surface and Interface Analysis",

issn = "0142-2421",

publisher = "John Wiley and Sons Ltd",

number = "13",

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TY - JOUR

T1 - Magnetization-induced optical second harmonic generation from the surface of Co-doped rutile TiO2(110)

AU - Watanabe, R.

AU - Yuasa, M.

AU - Yahata, Y.

AU - Mizutani, G.

AU - Suzuki, T.

AU - Segawa, Y.

AU - Matsumoto, Y.

AU - Yamamoto, Y.

AU - Koinuma, H.

PY - 2008/12

Y1 - 2008/12

N2 - We have investigated the surface magnetism of 5 at% Co-doped rutile TiO2(110) using magnetization-induced optical second harmonic generation (MSHG) in the longitudinal Kerr configuration with the incident beam angle of 4°. MSHG is observed at both 2hℏω = 2.33 eV and 2hℏω = 4.20 eV. MSH intensity showed a hysteresis as a function of the external magnetic field for the second harmonic photon energy of 2ℏω = 4.20 eV at which the absorption length limits the MSHG origin to the surface layer of 10 nm due to the TiO2 bulk. Since 5 at% Co: TiO2(110) is judged to have no metallic Co near the top surface by XPS, the hysteresis is attributed to a carrier-induced ferromagnetism at the surface of this material.

AB - We have investigated the surface magnetism of 5 at% Co-doped rutile TiO2(110) using magnetization-induced optical second harmonic generation (MSHG) in the longitudinal Kerr configuration with the incident beam angle of 4°. MSHG is observed at both 2hℏω = 2.33 eV and 2hℏω = 4.20 eV. MSH intensity showed a hysteresis as a function of the external magnetic field for the second harmonic photon energy of 2ℏω = 4.20 eV at which the absorption length limits the MSHG origin to the surface layer of 10 nm due to the TiO2 bulk. Since 5 at% Co: TiO2(110) is judged to have no metallic Co near the top surface by XPS, the hysteresis is attributed to a carrier-induced ferromagnetism at the surface of this material.

KW - Co/rutile TiO

KW - Dilute magnetic semiconductors

KW - Hysteresis

KW - Magnetization-induced optical second harmonic generation (MSHG)

KW - Surface magnetization

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DO - 10.1002/sia.2907

M3 - Article

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VL - 40

SP - 1692

EP - 1695

JO - Surface and Interface Analysis

JF - Surface and Interface Analysis

SN - 0142-2421

IS - 13

ER -