Photoemission studies of magnetic semiconductors

2005 Fiscal Year Final Research Report Summary

• Project/Area Number: 14076209
• Research Category: Grant-in-Aid for Scientific Research on Priority Areas
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: University of Tokyo
• Principal Investigator: FUJIMORI Atsushi U. of Tokyo, Graduate School of Frontier Sciences, Professor, 大学院新領域創生科学研究科, 教授 (10209108)
• Co-Investigator(Kenkyū-buntansha): MIZOKAWA Takashi U. of Tokyo, Graduate School of Frontier Sciences, Associate Proffessor, 大学院新領域創生科学研究科, 助教授 (90251397)
• Project Period (FY): 2002 – 2005
• Keywords: Magnetic semiconductors / Photoemission spectroscopy / Soft xjray magnetic circular dichroism / High-temperature ferromagnetism / Nano-struictures

Research Abstract

* Soft x-ray absorption (XAS) and soft x-ray magnetic circular dichroism (XMCD) studies at the Co 2p core absorption edges of Zn1-xCoxO (x=0.05) prepared by the pulsed laser deposition (PLD) method were performed and the obtained spectra were analyzed using cluster-model calculations. We have found that the temperature and the magnetic field dependences of the XMCD intensity were very different from non-interacting Co ions and that ferromagnetic and antiferromagnetic interactions between the Co ions coexist inhomogeneously.
* XAS and resonance photoemission studies at the Mn 2p core absorption edges of Ga1-xMnxN prepared by the molecular-beam epitaxy (MBE) method were performed, and the obtained spectra were analyzed using cluster-model calculations. We found that the valence of the Mn ion was 2+ and that the Mn 3d states were largely distributed within the valence band of the GaN host. Acceptor levels formed by the Mn doping above the valence-band maximum Mn were found to be occupied b y electrons, indicating that the high-temperature ferromagnetism predicted by theory was nor realized because of the compensation effect.
* XAS, XMCD and resonance photoemission studies were performed at the Cr 2p core absorption edges of Ga1-xCrxN (x=0.015). The Cr 2p XAS spectra indicated that the Cr was in the 3+ valence state. The Cr 3d partial density of states (PDOS) were largely distributed within the band gap of GaN, in striking contrast with Ga1-xMnxN. The Cr 3d PDOS was found to be suppressed at the Fermi level, and no Fermi-edge feature as predicted by band-structure calculations was observed.
* XAS and XMCD measurements were made on Zn1-xVxO (x=0.05) which exhibited weak ferromagentism. The V ions substituting Zn2+ were found to be responsible for the magnetic properties. From comparison of the XMCD spectra with the magnetic susceptibility, we found that 10% of V ions were paramagnetic and 90 % were strongly coupled with each other antiferromagnetically. Furthermore, the paramagnetic V ions were found to be influenced by the axial crystal field of the hexagonal ZnO host.

Research Products

• [Journal Article] Soft X-Ray Magnetic Circular Dichroism Study of Weakly Ferromagnetic Zn_<1-x>V_xO Thin Film (2007)
  • Author(s): Y.Ishida, J.I.Hwang, M.Kobayashi, Y.Takeda, K.Mamiya, J.Okamoto, S.-I.Fujimori, T.Okane, K.Terai, Y.Saitoh, Y.Muramatsu, A.Fujimori, A.Tanaka, H.Saeki, T.Kawai, H.Tabata
  • Journal Title: Appl. Phys. Lett 90 Pages: 022510--1-3
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Soft X-Ray Magnetic Circular Dichroism,Study of Weakly Ferromagnetic Zni-xVx0 Thin Film (2007)
  • Author(s): Y.Ishida, J.I.Hwang, M.Kobayashi, Y.Takeda, K.Mamiya, J.Okamoto, S.-I.Fujimori, T.Okane, K.Terai, Y.Saitoh, Y.Muramatsu, A.Fujimori, A.Tanaka, H.Saeki, T.Kawai, H.Tabata
  • Journal Title: Appl. Phys. Lett. 90 Pages: 022510--1-3
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Photoemission and X-Ray Absorption Studies of the Electronic Structure of GaN-Based Diluted Magnetic Semiconductors. (2006)
  • Author(s): J.I.Hwang, Y.Ishida, M.Kobayashi, Y.Osafune, T.Mizokawa, A.Fujimori, Y.Takeda, K.Terai, S-i.Fujimori, Y.Saitoh, Y.Muramatsu, A.Tanaka, T.Kondo, H.Munekata, M.Hashimoto, H.Tanaka, S.Hasegawa, H.Asahi
  • Journal Title: Physica Status Solidi B 383 Pages: 140-141
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Effect of Reducing Atmosphere on the Magnetism of Zn_<1-x>Co_xO(0<X<0.10)Nanoparticles, (2006)
  • Author(s): M.Naeem, S.K.Hasanain, M.Kobayashi, Y.Ishida, A.Fujimori, S.Buzby, S.I.Shah
  • Journal Title: Nanotechnology 17 Pages: 2675-2680
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Indication of Intrinsic Room-Temperature Ferromagnetism Ti_<1-x>Co_xO_<2-x> thin Film : An X-Ray Magnetic Circular Dichroism Study (2006)
  • Author(s): K.Mamiya, T.Koide, A.Fujimori, H.Tokano, H.Manaka, A.Tanaka, H.Toyosaki, T.Fukumura, M.Kawasaki
  • Journal Title: Appl. Phys. Lett 89 Pages: 062506--1-3
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Photoemission and X-Ray Absorption Studies of the Electronic Structure of GaN-Based Diluted Magnetic Semiconductors (2006)
  • Author(s): J.I.Hwang, Y.Ishida, M.Kobayashi, Y.Osafune, T.Mizokawa, A.Fujimori Y.Takeda, K.Terai, S-i, Fujimori, Y.Saitoh, Y.Muramatsu, A.Tanaka, T.Kondo, H.Munekata, M.Hashimoto, H.Tanaka, S.Hasegawa, H.Asahi
  • Journal Title: Physica Status Solidi B 383 Pages: 140-141
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Effect of Reducing Atmosphere on the Magnetism of Zni, Co. 0 (0<x<0.10) Nanop articles (2006)
  • Author(s): M.Naeem, S.K.Hasanain, M.Kobayashi, Y.Ishida, A.Fujimori S.Buzby, S.I.Shah
  • Journal Title: Nanotechnology 17 Pages: 2675-2680
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Indication of Intrinsic Room-Temperature Ferromagnetism in Tii _.Co0 2-6 Thin Film : An X-Ray Magnetic Circular Dichroism Study (2006)
  • Author(s): K.Mamiya, T.Koide, A.Fujimori, H.Tokano, H.Manaka, A.Tanaka, H.Toyosaki, T.Fukumura, M.Kawasaki
  • Journal Title: Appl. Phys. Lett 89 Pages: 062506 1-3
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Photoemission and Core-Magnetic Circular Dichroism Studies of Diluted Magnetic Semiconductors (2005)
  • Author(s): A.Fujimori, J.Okabayashi, Y.Takeda, T.Mizokawa, J.Okamoto, K.Mamiya, Y.Saitoh, Y.Muramatsu, M.Oshima, S.Ohya, M.Tanaka
  • Journal Title: J. Electron Spectrosc. Relat. Phenom. 144-147 Pages: 701-705
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] High-Energy Spectroscopic Study of the III-V Nitride-Based Diluted Magnetic Semiconductor Ga_<1-X>Mn_xN (2005)
  • Author(s): J.I.Hwang, Y.Ishida, M.Kobayashi, H.Hirata, K.Takubo, T.Mizokawa, A.Fujimori, J.Okamoto, K.Mainiya, Y.Saito, Y.Muramatsu, H.Ott, A.Tanaka, T.Kondo, H.Munekata
  • Journal Title: Phys. Rev. B 72 Pages: 085216-1-6;0504048
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Characterization of Magnetic Components in the Diluted Magnetic Semiconductor Zn_<1-x>Co_xO by X-ray Magnetic Circular Dichroism (2005)
  • Author(s): M.Kobayashi, Y.Ishida, J.I.Hwang, T.Mizokawa, A.Fujimori, J.Okamoto, K.Mamiya, Y.Takeda, T.Okane, Y.Saitoh, Y.Muramatsu, A.Tanaka, H.Saeki, H.Tabata, T.Kawai
  • Journal Title: Phys. Rev. B 72 Pages: 201201-1-4 0505387
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Photoemission and Core-Level Magnetic Circular Dichroism Studies of Diluted Magnetic Semiconductors (2005)
  • Author(s): A.Fujimori, J.Okabayashi, Y.Takeda, T.Mizokawa, J.Okamoto, K.Mamiya, Y.Saitoh, Y.Muramatsu, M.Oshima, S.Ohya, M.Tanaka
  • Journal Title: J. Electron Spectrosc. Relat. Phenom 144-147 Pages: 701-705
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Spin-Polarozed Surface State of MnSb(0001) (2005)
  • Author(s): 0.Rader, M.Levzaic, S.Blugel, A.Fujimori, A.Kimura, N.Kamakura, A.Kakizaki, S.Miiyanishi, H.Akinaga
  • Journal Title: New J. Phys. 7 Pages: 111--1-10
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] High-Energy Spectroscopic Study of the III-V Nitride-Based Diluted Magnetic Semiconductor Ga,Mn.N (2005)
  • Author(s): J.I.Hwang, Y.Ishida, M.Kobayashi, H.Hirata, K.Takubo, T.Mizokawa, A.Fujimori, J.Okamoto, K.Mamiya, Y.Saito, Y.Muramatsu, H.Ott A.Tanaka, T.Kondo, H.Munekata
  • Journal Title: Phys. Rev. B 72 Pages: 085216 1-6 ; 0504048
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Characterization of Magnetic Components in the Diluted Magnetic Semiconductor Znio.0 by X-ray Magnetic Circular Dichroism (2005)
  • Author(s): M.Kobayashi, Y.Ishida, J.I.Hwang, T.Mizokawa, A.Fujimoti, J.Okamot( K.Mamiya, Y.Takeda, T.Okane, Y.Saitoh, Y.Muramatsu, A.Tanaka, H.Saeki, H.Tabata, T.Kawai
  • Journal Title: Phys. Rev. B 72 Pages: 201201 1-4 ; 0505387
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Photoemission and Core-Level Magnetic Circular Dichroism Studies of Diluted Magnetic Semiconductors (2005)
  • Author(s): A.Fujimori, J.Okabayashi, Y.Takeda, T.Mizokawa, J.Okamoto K.Mamiya, Y.Saitoh, Y.Muramatsu, M.Oshima, S.Ohya, M.Tanaka
  • Journal Title: J. Electron Spectrosc. Relat. Phenom 144-147 Pages: 701-705
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Spin-Polarized Surface State of MnSb(0001) (2005)
  • Author(s): O.Rader, M.Levzaic, S.Blugel, A.Fujimori, A.Kimura, N.Kamakura, A.Kakizaki, S.Miyanishi, H.Akinaga
  • Journal Title: New J. Phys. 7 Pages: 111-1-0
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Photoemission study of the ferromagnetic diluted magnetic Semiconductor ZN_<1-x>V_xO" (2004)
  • Author(s): Y.Ishida, J.I.Hwallg, M.Kobayashi, A.Fujimori, H.Saeki, H.Tabata, T.Kawai
  • Journal Title: Physica B, 351 Pages: 304-306
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] X-ray absorption spectroscopy of transition-metal- doped dulited Magnetic semiconductors Zn_<1-x>Mn_xO (2004)
  • Author(s): J.Okabayashi, K.Ono, M.Mizuguchi, M.Oshima, T.Mizokawa, A.Fujimori, S.Sen Gupta, D.D.Sarma, M.Yuri, C.T.Chen, T.Fukumura, M.Kawasaki
  • Journal Title: J. Appl. Phys. 95 Pages: 3573-3575
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Density Dependent Electronic Structure of the Zinc-Blende-Type MnAs Dots on GaAs(100) Studied by Photoemission Spectroscopy (2004)
  • Author(s): J.Okabayashi, M.Mizuguchi, K.Ono, M.Oshima, A.Fujimori, H.Kuramochi, H.Akinaga
  • Journal Title: Phys. Rev. B 70 Pages: 233305-1-4
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Density Dependence of Zinc-Blende MnAs Dots studied by X-Ray Absorption Spectroscopy and X-Ray Magetic Circular Dichroism (2004)
  • Author(s): J.Okabyashi, M.Mizuguchi, K.Ono, M.Oshima, A.Fujimori, M.Yuri, C.T.Chen, H.Akinaga
  • Journal Title: J. Mag.Mag. Mater 272-276 Pages: 1553-1555
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Photoemission Study of the Ferromagnetic Diluted Magnetic Semiconductor Zn_<1-x>V_xO (2004)
  • Author(s): Y.Ishida, J.I.Hwang, M.Kobayashi, A.Fujimori, H.Saeki, H.Saeki, H.Tabata, T.Kawai
  • Journal Title: Physica B 351 Pages: 304-306
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Novel Spingtronic Materials Based on Ferromagnetic Semiconductor Chalcopyrites (2004)
  • Author(s): G.A.Medvedkin, S.I.Goloshchapov, V.G.Voevodin, K.Sato, T.Ishibashi, S.Mitani, K.Takanashi, A.Fujimori, Y.Ishida, J.Okabayashi, D.D.Sarma
  • Journal Title: Interntl. J. Nanoscience 3 Pages: 39-50
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Photoemission Spectroscopy of Diluted Mn in and on Solids (2004)
  • Author(s): T.Mizokawa, A.Fujimori, J.Okabayashi, 0.Rader
  • Journal Title: J. Electron Spectrosc. Relat. Phenom. 136 Pages: 21-30
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Photoe mission study of the ferromagnetic diluted magnetic Semiconductor ZniХ.0 (2004)
  • Author(s): Y.Ishida, J.I.Hwang, M.Kobayashi, A.Fujimori, H.Saeki, H.Tabata, T.Kawai
  • Journal Title: Physica B 351 Pages: 304-306
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] X-ray absorption spectroscopy of transition-metal-doped dulited magnetic semiconductors Zni,. MnO (2004)
  • Author(s): J.Okabayashi, K.Ono, M.Muzuguchi, M.Oshima, T.Mizokawa, A.Fujimori, S.Sen Gupta, D.D.Sarma, M.Yuri, C.T.Chen, T.Fukumura, M.Kawasaki
  • Journal Title: J. Appl. Phys. 95 Pages: 3573・575
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Density Dependent Electronic Structure of the Zinc-Blende-Type MnAs Dots on GaAs (100) Studied by Photoemission Spectroscopy (2004)
  • Author(s): J.Okabayashi, M.Mizuguchi, K.Ono, M.Oshima, A.Fujimori H.Kuramochi, H.Akinaga
  • Journal Title: Phys. Rev. B 70 Pages: 233305-1
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Density Dependence of Zinc-Blende MnAs Dots Studied by X-ray Absorption Spectroscopy and X-Ray Magnetic Circular Dichroism (2004)
  • Author(s): J.Okabayashi, M.Mizuguchi, K.Ono, M.Oshima, A.Fujimori, M.Yuri, C.T.Chen, H.Akinaga
  • Journal Title: J. Mag. Mag. Mater 272.276 Pages: 1553-1555
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Photoemission Study of the Ferromagnetic Diluted Magnetic Semiconductor Zni _xV.0 (2004)
  • Author(s): Y.Ishida, J.I.Hwang, M.Kobayashi, A.Fujimori, H.Saeki H.Tabata, T.Kawai
  • Journal Title: Physica B 351 Pages: 304-306
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Novel Spingtronic Materials Based on Ferromagnetic Semiconductor Chalcopyrites (2004)
  • Author(s): G.A.Medvedkin, S.I.Goloshchapov, V.G.Voevodin, K.Sato T.Ishibashi, S.Mitani, K.Takanashi, A.Fujimori, Y.Ishida, J.Okabayashi, D.D.Sarma
  • Journal Title: Internal, J. Nanoscience 3 Pages: 39-50
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Novel Mn-doped chalcopyrites (2003)
  • Author(s): K.Sato, G.A.Medvedkin, T.Ishibashi, S.Mitani, K.Takanashi, Y.Ishida, D.D.Sarma, J.Okabayashi, A.Fujimori, T.Kamatani, H.Akai
  • Journal Title: J. Phys. Chem. Solids 64 Pages: 1461-1468
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] in situ Photoemission study of the room-temperature ferromagnet ZnGep_2 : Mn" (2003)
  • Author(s): Y.Ishida, D.D.Sarma, K.Okazaki, J.Okabayashi, J.I.Hwang, H.Ott, A.Fuj imori, G.A.Medvedkin, T.Ishibashi, K.Sato
  • Journal Title: Phys. Rev. Lett. 91 Pages: 107202 1-4
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Novel Mn-doped chalcopyrites (2003)
  • Author(s): K.Sato, G..A.Medvedkin, T.Ishibashi, S.Mitani, K.Takanashi, Y.Ishida, D.D.Sarma, J.Okabayashi, A.Fujimori, T.Kamatani, H.Altai
  • Journal Title: J. Phys. Chem. Solids 64 Pages: 1461-1468
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] In situ photoemission study of the room-temperature ferromagnet ZnGep2 : Mn (2003)
  • Author(s): Y.Ishida, D.D.Sarma, K.Okazaki, J.Okabayashi, J.I.Hwang, H.Ott A.Fujimori, G.A.Medvedkin, T.Ishibashi, K.Sato
  • Journal Title: Phys. Rev. Lett. 91 Pages: 107202 1-4
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] 「研究成果報告書概要(欧文)」より
  • Author(s): A.Fujimori, J.Okabayashi, Y.Takeda, T.Mizokawa, J.Okamoto K.Mamiya, Y.Saitoh, Y.Muramatsu, M.Oshima, S.Ohya, M.Tanaka
  • Journal Title: J. Electron Sepctrosc. Relat. Phenom 144-147 Pages: 701-705