2003 Fiscal Year Annual Research Report

サブミクロン超格子強磁性量子細線・タイル及び超高スピン巨大単分子のスピニクス

Research Project

Project/Area Number	15087209
Research Institution	Osaka City University
Principal Investigator	工位武治大阪市立大学, 大学院・理学研究科, 教授 (10117955)
Co-Investigator(Kenkyū-buntansha)	豊田和男大阪市立大学, 大学院・理学研究科, 助手 (60347482) 佐藤和信大阪市立大学, 大学院・理学研究科, 助教授 (90264796) 塩見大輔大阪市立大学, 大学院・理学研究科, 助教授 (40260799)
Keywords	磁性 / スピンエレクトロニクス / 原子分子処理 / 量子細線 / 微小共振器
Research Abstract	本研究課題では、初年度は研究対象として、まず(A-1)ミクロンからサブミクロンオーダーで電子線リソグラフィ技術によって超微細加項を施したパーマロイ強磁性薄膜量子細線(1次元配列系)、(A-2)セミマクロスケールで群論的な縮重機能をもつ量子タイル(2次元配列人工格子型薄膜パーマロイ強磁性体集合系)をモデル系として採用し、スビン集合系の数・幾何学的な形状と配列・群論的な対称性を制御した磁気双極子スピン波の伝播特性を明らかにすることを目的に行った。ここでは、これまでのKittel modeやWalker modeに由来するスピン波の強磁性共鳴の線幅が極めて小さい(1ガウス以下)強磁性YIGの微細加工超格子系を新たな量子スピン波の観測対象とする研究課題にも取り組んだ。YIG系は、マイクロ波外部輻射場に対する顕著な非線形現象を示す可能性があり、磁気双極子スビン波由来のスビン乱流の出現条件を解明することが,最も重要な課題となる。また、得られる情報は、今後「液体マグネット」の設計などと根本的に関連するが、新たに「強誘電性スピン協同系」の短距離秩序相の磁気的な構造・現象を解明する端緒を見つけることを最終目標にした研究を実施した。本年度は、CW電子スピン強磁性共鳴法によって、A-1、A-2の磁気構造を解明した。A-1の構造については、薄膜に垂直な方向に観測されてきた従来までのスピン波Walker modeに対して、量子細線の横方向に励起されたスピン定在波(lateral Walker mode)を強磁性共鳴法によってはじめて見出した。また、強磁性量子細線をミクロンオーダーで1次元的に配列した人工超格子系では、細線間の巨大な磁気双極子相互作用に由来する半巨視的な量子協同現象を見出した。解析から得られた磁気的なパラメータは、超格子構造を考慮した理論計算と一致した。(718字)

Research Products

(20 results)

All Other

All Publications (20 results)

[Publications] H.Matsuoka et al.: "Pseudo-octahedral high-spin Co(II) complexes with orbitally degenerate ground states as studied by SQUID and ESR spectroscopy"Synthetic Metals. 137. 1213-1214 (2003)
[Publications] Y.Morita et al.: "Synthesis and spin structure of 8-(p-halophenyl)-6-oxophenalenoxyl derivative"Synthetic Metals. 137. 1217-1218 (2003)
[Publications] D.Shiomi et al.: "Hyperfine Structure of ESR Spectra as a Probe for Heisenberg Exchange Couplings in Nitroxide Triradicals Serving as Building Blocks for Molecule-Based Ferrimagnets"App.Magn.Reson.. 23. 495-506 (2003)
[Publications] H.Matsuoka et al.: "2-D Electron Spin Transient Nutation Spectroscopy of Lanthanoid Ion Eu^<2+>(^8S_<1/2>) in a CaF_2 Single Crystal Electron Spin Resonance Spectroscopy : Transition Moment Spectroscopy"App.Magn.Reson.. 23. 517-538 (2003)
[Publications] S.Hiraoka et al.: "A Stable Radical-Substituted Radical Cation with Strongly Ferromagnetic Interaction : Nitronyl Nitroxide-Substituted 5,10-Diphenyl-5,10-dihydrophenazine Radical Cation"J.Am.Chem.Soc.. 126. 58-59 (2004)
[Publications] Y.Morita et al.: "The First Metal Complexes of 4,4'-Biimidazole and 4,4'-Biimidazolate with Hydrogen-Bonding Networks on the Cu(II) Complexes"Chem.Lett.. 33. 188-189 (2004)
[Publications] H.Matsuoka et al.: "Importance of fourth-order zero-field splitting terms in random-orientation EPR spectra of Eu(II)-doped strontium aluminate"J.Chem.Phys.. 107. 11539-11546 (2003)
[Publications] Y.Morita et al.: "A novel organic neutral radical system : topological effects in oxophenalenoxyls"Polyhedron. 22. 2205-2208 (2003)
[Publications] Y.Morita et al.: "Redox-based spin diversity : a reversible topological spin switching in oxophenalenoxyl systems"Polyhedron. 22. 2209-2213 (2003)
[Publications] Y.Morita et al.: "Electronic-spin and columnar crystal structures of stable 2,5,8-tri-tert-butyl-1,3-diazaphenalenyl radical"Polyhedron. 22. 2199-2204 (2003)
[Publications] Y.Morita et al.: "Syntheses and spin structures of 1,6-dithiapyrene derivatives having imino nitroxide or oxoverdazyl moiety"Polyhedron. 22. 2219-2225 (2003)
[Publications] Y.Morita et al.: "Topological Symmetry Control in Spin Density Distribution : Spin Chemistry of Phenalenyl-Based Neutral Monoradical Systems"Organic Letters. 5. 3289-3291 (2003)
[Publications] K.Okada et al.: "Preparation and Magnetic Properties on Mn(hfac)2-Complexes of 2-(5-Pyrimidinyl)- and 2-(3-Pyridyl)-Substituted Nitronyl Nitroxides"Inorg.Chem.. 42. 3221-3228 (2003)
[Publications] K.Sato et al.: "A cw/pulsed ESR study of a calix [4] arene biradical with two nitroxides"Synthetic Metals. 137. 1197-1198 (2003)
[Publications] D.Shiomi et al.: "Mechanism for spin alignments in organic molecule-based ferrimagnetics"Synthetic Metals. 137. 1155-1156 (2003)
[Publications] Y.Morita et ai.: "Generation and properties of 2,5,8-tri-tert-butyl-6-oxo-7,9-diazaphenalenoxyl"Synthetic Metals. 137. 1209-1210 (2003)
[Publications] Y.Morita et al.: "A synthetic study of a homospin diradical based on 6-oxophenalenoxyl"Synthetic Metals. 137. 1207-1208 (2003)
[Publications] Y.Morita et al.: "Heterospin diradical with 6-oxophenalenoxyl and nitronyl nitroxide"Synthetic Metals. 137. 1211-1212 (2003)
[Publications] T.Takui et al.: "ナノ・IT時代の分子機能材料と素子開発(第1編第7章第2節,実験-分子性・有機磁性材料の精密分子設計・合成とスピンテクノロジー)"NTS. 29 (2004)
[Publications] T.Takui et al.: "EPR of Free Radicals in Solids Trends in Methods and Applications (Chapter 11, MOLECULE-BASED EXCHANGE-COUPLED HIGH-SPIN CLUSTERS)"Kluwer. 84 (2003)

2003 Fiscal Year Annual Research Report

サブミクロン超格子強磁性量子細線・タイル及び超高スピン巨大単分子のスピニクス

Principal Investigator

工位 武治 大阪市立大学, 大学院・理学研究科, 教授 (10117955)

Research Products

[Publications] H.Matsuoka et al.: "Pseudo-octahedral high-spin Co(II) complexes with orbitally degenerate ground states as studied by SQUID and ESR spectroscopy"Synthetic Metals. 137. 1213-1214 (2003)

[Publications] Y.Morita et al.: "Synthesis and spin structure of 8-(p-halophenyl)-6-oxophenalenoxyl derivative"Synthetic Metals. 137. 1217-1218 (2003)

[Publications] D.Shiomi et al.: "Hyperfine Structure of ESR Spectra as a Probe for Heisenberg Exchange Couplings in Nitroxide Triradicals Serving as Building Blocks for Molecule-Based Ferrimagnets"App.Magn.Reson.. 23. 495-506 (2003)

[Publications] H.Matsuoka et al.: "2-D Electron Spin Transient Nutation Spectroscopy of Lanthanoid Ion Eu^<2+>(^8S_<1/2>) in a CaF_2 Single Crystal Electron Spin Resonance Spectroscopy : Transition Moment Spectroscopy"App.Magn.Reson.. 23. 517-538 (2003)

[Publications] S.Hiraoka et al.: "A Stable Radical-Substituted Radical Cation with Strongly Ferromagnetic Interaction : Nitronyl Nitroxide-Substituted 5,10-Diphenyl-5,10-dihydrophenazine Radical Cation"J.Am.Chem.Soc.. 126. 58-59 (2004)

[Publications] Y.Morita et al.: "The First Metal Complexes of 4,4'-Biimidazole and 4,4'-Biimidazolate with Hydrogen-Bonding Networks on the Cu(II) Complexes"Chem.Lett.. 33. 188-189 (2004)

[Publications] H.Matsuoka et al.: "Importance of fourth-order zero-field splitting terms in random-orientation EPR spectra of Eu(II)-doped strontium aluminate"J.Chem.Phys.. 107. 11539-11546 (2003)

[Publications] Y.Morita et al.: "A novel organic neutral radical system : topological effects in oxophenalenoxyls"Polyhedron. 22. 2205-2208 (2003)

[Publications] Y.Morita et al.: "Redox-based spin diversity : a reversible topological spin switching in oxophenalenoxyl systems"Polyhedron. 22. 2209-2213 (2003)

[Publications] Y.Morita et al.: "Electronic-spin and columnar crystal structures of stable 2,5,8-tri-tert-butyl-1,3-diazaphenalenyl radical"Polyhedron. 22. 2199-2204 (2003)

[Publications] Y.Morita et al.: "Syntheses and spin structures of 1,6-dithiapyrene derivatives having imino nitroxide or oxoverdazyl moiety"Polyhedron. 22. 2219-2225 (2003)

[Publications] Y.Morita et al.: "Topological Symmetry Control in Spin Density Distribution : Spin Chemistry of Phenalenyl-Based Neutral Monoradical Systems"Organic Letters. 5. 3289-3291 (2003)

[Publications] K.Okada et al.: "Preparation and Magnetic Properties on Mn(hfac)2-Complexes of 2-(5-Pyrimidinyl)- and 2-(3-Pyridyl)-Substituted Nitronyl Nitroxides"Inorg.Chem.. 42. 3221-3228 (2003)

[Publications] K.Sato et al.: "A cw/pulsed ESR study of a calix [4] arene biradical with two nitroxides"Synthetic Metals. 137. 1197-1198 (2003)

[Publications] D.Shiomi et al.: "Mechanism for spin alignments in organic molecule-based ferrimagnetics"Synthetic Metals. 137. 1155-1156 (2003)

[Publications] Y.Morita et ai.: "Generation and properties of 2,5,8-tri-tert-butyl-6-oxo-7,9-diazaphenalenoxyl"Synthetic Metals. 137. 1209-1210 (2003)

[Publications] Y.Morita et al.: "A synthetic study of a homospin diradical based on 6-oxophenalenoxyl"Synthetic Metals. 137. 1207-1208 (2003)

[Publications] Y.Morita et al.: "Heterospin diradical with 6-oxophenalenoxyl and nitronyl nitroxide"Synthetic Metals. 137. 1211-1212 (2003)

[Publications] T.Takui et al.: "ナノ・IT時代の分子機能材料と素子開発(第1編第7章第2節,実験-分子性・有機磁性材料の精密分子設計・合成とスピンテクノロジー)"NTS. 29 (2004)

[Publications] T.Takui et al.: "EPR of Free Radicals in Solids Trends in Methods and Applications (Chapter 11, MOLECULE-BASED EXCHANGE-COUPLED HIGH-SPIN CLUSTERS)"Kluwer. 84 (2003)

工位武治大阪市立大学, 大学院・理学研究科, 教授 (10117955)