1999 Fiscal Year Annual Research Report

半導体超構造の物質設計とスピン制御

Research Project

Project/Area Number	09244105
Research Institution	Osaka University
Principal Investigator	吉田博大阪大学, 産業科学研究所, 教授 (30133929)
Co-Investigator(Kenkyū-buntansha)	梅原雅捷科学技術庁無機材質研究所, 主任研究官小柳剛山口大学, 大学院・工学研究科, 教授 (90178385) 田中雅明東京大学, 大学院・工学系研究科, 助教授 (30192636) 秋永広幸産業技術融合領域研究所, 主任研究官
Keywords	束縛磁気ポーラロン / 希薄磁性半導体 / 強磁性微細構造 / 物質設計 / 一次元半導体磁気光学結晶 / 強磁性金属 / 半導体ヘテロ構造 / 強磁性半導体(GaMn)As量子ヘテロ構造におけるトンネル磁気抵抗効果
Research Abstract	ZnOにおいて、ドナーとアクセプターによる同時ドーピング法による抵抵抗p型半導体創製法の物質設計を行った。ZnO中のMnは反強磁性状態となり、ホールドーピングにより強磁性状態となる。ZnO中のV,Cr,Fe,Co,Niは透明な強磁性体となる。また、GaNにMnをドープすると強磁性状態となりFeをドープすると反強磁性状態となる。(吉田)強磁性金属(MnAs)/半導体(GaAs)/強磁性金属(MnAs)から成る三層エピタキシャルヘテロ構造の磁気輸送特性において、固体磁気メモリやセンサの基本原理となるスピンバルブ効果を明瞭に観測した。強磁性半導体(GaMn)As量子ヘテロ構造(単一障壁および二重障壁構造)において、大きなトンネル磁気抵抗効果を明瞭に観測した。DBR/(GaAs:MnAsナノクラスタ)/DBR構造(一次元半導体磁気光学結晶)を作製し、所望の波長において光の局在による磁気光学効果の増大を室温で明瞭に観測した。(田中)Ge1-xMnxTe薄膜の磁気特性を明らかにし、アモルファスは常磁性であるのに対し、これをアニールで結晶化した薄膜は強磁性となることから、相転移による強磁性微細構造の作製が可能であることがわかった。クラスタイオンビーム法によるPb1-xMnxTe薄膜の作製を行い、Te組成制御およびAgドーピングによって、n、p型両方のエピタキシャル薄膜を得、各々の電気的特性を明らかにするとともに、pn接合を試作した。(小柳)磁化の揺らぎを考慮した希薄磁性半導体中の束縛磁気ポーラロンの新しい計算方法を開発し、低温から高温までの全温度領域に於て束縛磁気ポーラロンのenergeticsを記述出来る事を示した。また、正孔型束縛磁気ポーラロンの計算を行い、電子型の場合との相違を明らかにした。(梅原)強磁性体金属であるMnSbのナノサイズクラスターをGaAs基板上に分散させた超薄膜において、室温、かつ比較的小さな磁場で、10000%以上の磁気抵抗効果を示す材料の開発に成功した。この超薄膜は磁場に敏感な電流-電圧特性を示し、あるしきい値電圧以上で磁場の印加により2桁以上もの電流変化を示すことを発見した。(秋永)

Research Products

(28 results)

All Other

All Publications (28 results)

[Publications] H. Katayama-Yoshida: "Theoretical Predictions for Codoping Properties in Wide Band-gap Semiconductors"Jpn. J. Appl. Phys. (2000)
[Publications] H. Katayama-Yoshida: "Materials Design in Diamond from the First Principles Calculation : Prediction and experiment"Advanced Materials 99, - New Semiconducting Materials : Diamond and Related Materials. 35 (1999)
[Publications] H. Katayama-Yoshida: "Co-doping Method in Wide Band-gap Semiconductors : Application to GaN, AlN, ZnSe, CuInS2 and Diamond"Inst. Phys. Conf. Ser. No. 162, Compound Semiconductors 1998 (edited by H. Sakaki, J-C Woo, N. Yokoyama, and H. Hirayama, IOP publishing Ltd. London, 1999). No.162. 747-756 (1999)
[Publications] 吉田博: "半導体における第一原理からの物質設計"まてりあ. 38・2. 134-143 (1999)
[Publications] 吉田博: "ワイドギャップ半導体の新しい価電子制御法:予測と実験"まてりあ. 第39巻. (2000)
[Publications] K. Shirai: "Anharmonicities in optical spectra of a-rhombohedral boron"Physica B. 263-264. 791-794 (1999)
[Publications] T. Yamamoto: "Solution Using a Codoping Method to Unipolarity for the Fabrication of p-Type ZnO"Jpn. J. Appl. Phys.. 38. L166-L169 (1999)
[Publications] T. Yamamoto: "Unipolarity of ZnO with a Wide-Band Gap and its Solution Using Codoping Method"J. Crystal Growth. (2000)
[Publications] T. Yamamoto: "Effects of oxygen incorporation in p-type AlN crystals doped with carbon species"Physica B. 273-274. 113-115 (1999)
[Publications] T. Yamamoto: "Differences in the electronic structures and compensation mechanism between n-type Zn-and Cd-doped CuInS2 crystals"Physica B. 273-274. 927-929 (1999)
[Publications] M. Tanaka: "Expitaxial Growth and Properties of MnAs/GaAs/MnAs Trilayer Heterostructures"J. Magnetism & Magnetic Materials. 198. 719-721 (1999)
[Publications] M. Tanaka: "Ferromagnet/Semiconductor Hybrid Structures Grown by Molecular Beam Epitaxy"J. Crystal Growth. 201/202. 660-669 (1999)
[Publications] T. Hayashi: "Tunneling Spectroscopy and Magnetoresistance in (GaMn)As/AlAs/(GaMn)As Ultrathin Magnetic Semiconductor Heterostructures"J. Crystal Growth. 201/202. 689-692 (1999)
[Publications] J. Okabayashi: "Mn 3d Partial Density of States in (GaMn)As Studied by Resonance Photoemission Spectroscopy"Phys Rev. B. 59. R2486-R2489 (1999)
[Publications] M. Oshima: "Photoelectron Spectroscopy and Magnetic Properties of Manganese Pnictides Nanocrystals Formed on Passivated GaAs Substrates"Jpn. J. Appl. Phys. 38. 373-376 (1999)
[Publications] K. Shimada: "Spin-Resolved Core-Level and Valence-Band Photoemission Spectroscopy of Ferromagnetic MnAs"J. Electron Spectroscopy and Related Phenomena. 101-103. 383-387 (1999)
[Publications] J. Szczytko: "Mn Impurity in (GaMn)As Epilayers"Phys. Rev. B. 60. 8304 (1999)
[Publications] Y. Mishima: "Low-Temperature MBE Growth and Properties of (Ga, Er)As"18th Electronic Mateials Symposium. paper I-7. 209-212 (1999)
[Publications] M. Oshima: "Growth and Properties of magnetic Nanostructures o Semiconductor Surface"J. Magnetic Society of Japan. 24・2. 67-73 (2000)
[Publications] H. Shimizu: "Enhanced Magneto-Optical Effect of GaAs : MnAs Magnetic Nanoclusters with GaAs/AlAs Distributed Bragg Reflectors : A Semiconductor Based Mgneto-Photonic Crystal"5th Symp. on the Physics and Application of Spin-Related Phenomena in Semiconductors. paper C2. 68-71 (1999)
[Publications] H. Shimizu: "Magneto-Optical Spectra of Ferromagnetic Semiconductor GaMnAs"5th Symp. on the Physics and Application of Spin-Related Phenomena in Semiconductors. paper H14. 192-195 (1999)
[Publications] J. Okabayashi: "Electronic Structure of Gal-xMnxAs Studied by Angle-Resolved Photoemission Spectroscopy"5th Symp. on the Physics and Application of Spin-Related Phenomena in Semiconductors. paper H2. 158-161 (1999)
[Publications] Y. Fukuma: "Magnetic properties of Gel-xMnxTe films prepared by sputtering method"5th Symposium on the Physics and Application of Spin-Related Phenomena in Semiconductors. (1999)
[Publications] Masakatsu Umehara: "Anomalous dense conduction electron states and magnetism in EuSe : Homogeneous electron state and carrier induced magnetic ordering"Phys. Rev. B. 60, No. 1. 445-454 (1999)
[Publications] H. Akinaga: "Room-temperature thousand-fold magentoresistance change in MnSb granular films : Magnetoresistive switch effect"Appl. Phys. Lett.. 76, 3. 357-359 (2000)
[Publications] M. Mizuguchi: "Formation and structural investigation of MnSb dots on S-passivated GaAs(001) substrates"J. Cryst. Growth.. (2000)
[Publications] M. Mizuguchi: "Formation and magnetotransport properties of nanoscale MnSb dots"J. Appl. Phys.. (2000)
[Publications] M. Mizuguchi: "Crystallographic and magneto-optical studies of nanoscaled MnSb dots grown on GaAs"Appl. Phys. Lett.. (2000)

1999 Fiscal Year Annual Research Report

半導体超構造の物質設計とスピン制御

Principal Investigator

吉田 博 大阪大学, 産業科学研究所, 教授 (30133929)

Research Products

[Publications] H. Katayama-Yoshida: "Theoretical Predictions for Codoping Properties in Wide Band-gap Semiconductors"Jpn. J. Appl. Phys. (2000)

[Publications] H. Katayama-Yoshida: "Materials Design in Diamond from the First Principles Calculation : Prediction and experiment"Advanced Materials 99, - New Semiconducting Materials : Diamond and Related Materials. 35 (1999)

[Publications] 吉田博: "半導体における第一原理からの物質設計"まてりあ. 38・2. 134-143 (1999)

[Publications] 吉田博: "ワイドギャップ半導体の新しい価電子制御法:予測と実験"まてりあ. 第39巻. (2000)

[Publications] K. Shirai: "Anharmonicities in optical spectra of a-rhombohedral boron"Physica B. 263-264. 791-794 (1999)

[Publications] T. Yamamoto: "Solution Using a Codoping Method to Unipolarity for the Fabrication of p-Type ZnO"Jpn. J. Appl. Phys.. 38. L166-L169 (1999)

[Publications] T. Yamamoto: "Unipolarity of ZnO with a Wide-Band Gap and its Solution Using Codoping Method"J. Crystal Growth. (2000)

[Publications] T. Yamamoto: "Effects of oxygen incorporation in p-type AlN crystals doped with carbon species"Physica B. 273-274. 113-115 (1999)

[Publications] T. Yamamoto: "Differences in the electronic structures and compensation mechanism between n-type Zn-and Cd-doped CuInS2 crystals"Physica B. 273-274. 927-929 (1999)

[Publications] M. Tanaka: "Expitaxial Growth and Properties of MnAs/GaAs/MnAs Trilayer Heterostructures"J. Magnetism & Magnetic Materials. 198. 719-721 (1999)

[Publications] M. Tanaka: "Ferromagnet/Semiconductor Hybrid Structures Grown by Molecular Beam Epitaxy"J. Crystal Growth. 201/202. 660-669 (1999)

[Publications] T. Hayashi: "Tunneling Spectroscopy and Magnetoresistance in (GaMn)As/AlAs/(GaMn)As Ultrathin Magnetic Semiconductor Heterostructures"J. Crystal Growth. 201/202. 689-692 (1999)

[Publications] J. Okabayashi: "Mn 3d Partial Density of States in (GaMn)As Studied by Resonance Photoemission Spectroscopy"Phys Rev. B. 59. R2486-R2489 (1999)

[Publications] M. Oshima: "Photoelectron Spectroscopy and Magnetic Properties of Manganese Pnictides Nanocrystals Formed on Passivated GaAs Substrates"Jpn. J. Appl. Phys. 38. 373-376 (1999)

[Publications] K. Shimada: "Spin-Resolved Core-Level and Valence-Band Photoemission Spectroscopy of Ferromagnetic MnAs"J. Electron Spectroscopy and Related Phenomena. 101-103. 383-387 (1999)

[Publications] J. Szczytko: "Mn Impurity in (GaMn)As Epilayers"Phys. Rev. B. 60. 8304 (1999)

[Publications] Y. Mishima: "Low-Temperature MBE Growth and Properties of (Ga, Er)As"18th Electronic Mateials Symposium. paper I-7. 209-212 (1999)

[Publications] M. Oshima: "Growth and Properties of magnetic Nanostructures o Semiconductor Surface"J. Magnetic Society of Japan. 24・2. 67-73 (2000)

[Publications] H. Shimizu: "Enhanced Magneto-Optical Effect of GaAs : MnAs Magnetic Nanoclusters with GaAs/AlAs Distributed Bragg Reflectors : A Semiconductor Based Mgneto-Photonic Crystal"5th Symp. on the Physics and Application of Spin-Related Phenomena in Semiconductors. paper C2. 68-71 (1999)

[Publications] H. Shimizu: "Magneto-Optical Spectra of Ferromagnetic Semiconductor GaMnAs"5th Symp. on the Physics and Application of Spin-Related Phenomena in Semiconductors. paper H14. 192-195 (1999)

[Publications] J. Okabayashi: "Electronic Structure of Gal-xMnxAs Studied by Angle-Resolved Photoemission Spectroscopy"5th Symp. on the Physics and Application of Spin-Related Phenomena in Semiconductors. paper H2. 158-161 (1999)

[Publications] Y. Fukuma: "Magnetic properties of Gel-xMnxTe films prepared by sputtering method"5th Symposium on the Physics and Application of Spin-Related Phenomena in Semiconductors. (1999)

[Publications] Masakatsu Umehara: "Anomalous dense conduction electron states and magnetism in EuSe : Homogeneous electron state and carrier induced magnetic ordering"Phys. Rev. B. 60, No. 1. 445-454 (1999)

[Publications] H. Akinaga: "Room-temperature thousand-fold magentoresistance change in MnSb granular films : Magnetoresistive switch effect"Appl. Phys. Lett.. 76, 3. 357-359 (2000)

[Publications] M. Mizuguchi: "Formation and structural investigation of MnSb dots on S-passivated GaAs(001) substrates"J. Cryst. Growth.. (2000)

[Publications] M. Mizuguchi: "Formation and magnetotransport properties of nanoscale MnSb dots"J. Appl. Phys.. (2000)

[Publications] M. Mizuguchi: "Crystallographic and magneto-optical studies of nanoscaled MnSb dots grown on GaAs"Appl. Phys. Lett.. (2000)

吉田博大阪大学, 産業科学研究所, 教授 (30133929)