2007 Fiscal Year Final Research Report Summary
Magnetic Anisotropy and Orbilal Magnetic Moment in Ordered FePt Nanoparticles
| Project/Area Number |
17310061
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nanostructural science
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| Research Institution | Hiroshima University |
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Principal Investigator |
MARUYAMA Hiroshi Hiroshima University, Graduate School of Science, Professor (20181836)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAJIMA Nobuo Hiroshima University, Graduate School of Science, Associate Professor (90302017)
ISHIMATSU Naoki Hiroshima University, Graduate School of Science, Assistant Professor (70343291)
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| Project Period (FY) |
2005 – 2007
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| Keywords | FePt nano-particles / CoPt thin films / X-ray magnetic circular dichroism / Orbital magnetic moment / Ordered alloy / Angle-resolved photoemission spectroscopy / Electronic structure |
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| Research Abstract |
In this study, we aimed to clarify the correlation between magnetic anisotropy and orbital moment in ordered alloys consisting of transition metal(TM; Fe or Co) and noble metal (NM; Pt or Au). Improvement in X-ray spectroscopic experiment and systematic measurement have provided the following outcomes with a comparison between nanometer-sized materials and the bulk sample
(1) Experimental achievements:
X-ray absorption spectroscopy has been extended to the range of high pressure up to 50 GPa. We have also succeeded in angle-resolved photoemission spectroscopy for the FePt_3 ordered alloy. These techniques are advantageous to studying the nanometer-sized materials in terms of electronic structure by a comparative analysis with the bulk sample. From X-ray magnetic circular dichroism (XMCD)at the Pt L_<2,3>-edges in CoPt thin films, the orbital component of Pt 5d states was estimated, consequently it has been revealed that the orbital moment is decreased with reducing the film thickness. To
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examine the anisotropy in the orbital component, the difference in dichroic intensity between out-of plane and in-plane geometries was also recorded. These techniques are available for understanding size effect; in particular, it is valuable to link in-situ measurement with sample preparation.
(2) Scientific outcomes:
For the role of NM in the ordered alloys, hybridization between NM 5d and TM 3d orbitals is important for forming the ordered structure, in consequence the spin-orbit interaction of NM 5d states is notable for the magnetic properties. For the perpendicular magnetization thin films, however, the enhancement in magnetic anisotropy constant is not directly associated with the magnitude of orbital moment, but may be ascribed to metallographic and crystallographic structures in the thin films. From the X-ray absorption experiments of Au_4Mn ordered alloy under high pressure, some discussion for Gruneisen parameter can be developed, and the magneto-volume effect should be examined on the basis of spin-fluctuation. Less
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[Journal Article] Valence-Band Photoemission Spectroscopy of a Single-Crystal FePt_32007
Author(s)
N., Tobita, K., Emi, N., Nakajima, H., Maruyama, Y., Miura, M., Higashiguchi, K., Shimada, H., Namatame, M., Taniguchi
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Journal Title
J. Mag. Mag. Mater 310
Pages: 1642-644
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Depth Profile of Spin and Orbital Magnetic Moments in Sub-nm Pt Film on Co2005
Author(s)
M., Suzuki, H., Muraoka, Y., Inaba, H., Miyagawa, N., Kawamura, T., Shimatsu, H., Maruyama, N., Ishimatsu, Y., Isohama, Y., Sonobe
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Journal Title
Phys. Rev 72
Pages: 054430-8
Description
「研究成果報告書概要(欧文)」より
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[Presentation] XMCD Study of Co and Pt Orbital Contribution to Perpendicular Magnetization in CoPt Thin-Films2008
Author(s)
N., Ishimatsu, R., Ogasawara, T., Sone, Y., Tsutsui, H., Maruyama, N., Nakajima, M., Sawada, H., Namatame, Y., Okazaki, H., Sato, T., Shimatsu, H., Muraoka
Organizer
The 12-th Hiroshima Inter. Sym. on Synchrotron Radiation
Place of Presentation
Hiroshima University, Higashi-Hiroshima
Year and Date
2008-03-13
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Angle-resolved photoemissicnstudy of Pt(111)2008
Author(s)
N., Tobita, S., Fukuda, N., Nakajima, N., Ishimatsu, H., Maruyama, H., Hayashi, K., Tanaka, J., Jiang, M., Higashiguchi, K., Shimada, H., Namatame, M., Taniguchi
Organizer
The 12-th Hiroshima Inter. Sym. on Synchrotron Radiation
Place of Presentation
Hiroshima University, Higashi-Hiroshima
Year and Date
2008-03-13
Description
「研究成果報告書概要(欧文)」より
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[Presentation] XMCD Study of Pt Orbital Contribution to Perpendicular Magnetization in CoPt Thin-Films2007
Author(s)
N., Ishimatsu, Y., Tsutsui, H., Maruyama, N., Kawamura, M., Suzuki, H., Osawa, Y., Okazaki, H., Sato, T., Shimatsu, H., Muraoka
Organizer
The 8-th Perpendicular Magnetic Recording Conference - PMRC2007
Place of Presentation
Tokyo International Forum, Tokyo
Year and Date
2007-10-15
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Angle-resolved photoemission study of FePt_3 ordered alloy2007
Author(s)
N., Tobita, S., Fukuda, N., Nakajima, N., Ishimatsu, H., Maruyama, K., Tanaka, Y., Miura, M., Higashiguchi, K., Shimada, H., Namatame, M., Taniguchi
Organizer
The 15-th International Conference on Vacuum Ultraviolet Radiation Physics, VUV-15
Place of Presentation
Berlin, Germany
Year and Date
2007-08-02
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Valence-band photoemission study of TM-Pt(TM=Cr, Fe)alloys2007
Author(s)
S., Fukuda, N., Tobita, N., Nakajima, N., Ishimatsu, H., Maruyama, K., Tanaka, Y., Miura, M., Higashiguchi, K., Shimada, H., Namatame, M., Taniguchi
Organizer
The 11-th Hiroshima Inter. Sym. on Synchrotron Radiation
Place of Presentation
Hiroshima University, Higashi-Hiroshima
Year and Date
2007-03-08
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Angle-resolved photoemission study of FePt_3 ordered alloy2007
Author(s)
N., Tobita, S., Fukuda, N., Nakajima, N., Ishimatsu, H., Maruyama, K., Tanaka, Y., Miura, M., Higashiguchi, K., Shimada, H., Namatame, M., Taniguchi
Organizer
The 11-th Hiroshima Inter. Sym. on Synchrotron Radiation
Place of Presentation
Hiroshima University, Higashi-Hiroshima
Year and Date
2007-03-08
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Film thickness dependence of the Co Las-edges XMCD in Co_<80>Pt_<20> films with perpendicular magnetic anisotropy2007
Author(s)
N., Ishimatsu, T., Sone, Y., Tsutsui, H., Maruyama, M., Sawada, H., Namatame, T., Shimatsu
Organizer
The 11-th Hiroshima Inter. Sym. on Synchrotron Radiation
Place of Presentation
Hiroshima University, Higashi-Hiroshima
Year and Date
2007-03-08
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Valence-Band Photoemission Spectroscopy of a Single-Crystal FePt_32006
Author(s)
N., Tobita, K., Emi, N., Nakajima, H., Maruyama, Y., Miura, M., Higashiguchi, K., Shimada, H., Namatame, M., Taniguchi
Organizer
Inter. Conf. on Magnetism, ICM-2006
Place of Presentation
Kyoto Inter. Conf. Center, Kyoto
Year and Date
2006-08-21
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Pt 5d Magnetic States in Ordered Fe-Pt Alloy under High Pressure Probed by Pt L_<2,3>-edges XMCD2006
Author(s)
N., Ishimatsu, M., Yamada, H., Maruyama, N., Kawamura, M., Suzuki
Organizer
The 5th Int. Conf. on Synchrotron Radiation in Materials Science, SRMS-5
Place of Presentation
Chicago, USA
Year and Date
2006-07-31
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Valence-band photoemission spectroscopy of a single crystal FePt_32006
Author(s)
N., Tobita, K., Emi, N., Nakajima, H., Maruyama, Y., Miura, M., Higashiguchi, K., Shimada, H., Namatame, M., Taniguchi
Organizer
The 10-th Hiroshima Inter. Sym. on Synchrotron Radiation
Place of Presentation
Hiroshima University, Higashi-Hiroshima
Year and Date
2006-03-16
Description
「研究成果報告書概要(欧文)」より
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