Toshiaki Saito
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Toshiaki Saito has a total of 24 co-authors. Here are the top co-authors by number of shared publications:
- Daisuke Asakura
National Institute of Advanced Industrial Science and Technology
3 shared publications - Takafumi Kitazawa
Department of Chemistry, Faculty of Science, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
3 shared publications - Takashi Kosone
Department of Science and Engineering, Graduate School of Science and Engineering, Tokyo Denki University, Hatoyama, Hiki-gun, Saitama 350-0394, Japan
3 shared publications Takayuki Ishikawa
Division of Electronics for Informatics, Hokkaido University, Sapporo 060-0814, Japan
3 shared publicationsToshikazu Katayama
Department of Physics, Faculty of Science, Toho University, Funabashi 274-8510, Japan
3 shared publicationsTsuneharu Koide
Photon Factory, IMSS, High Energy Accelerator Research Organization, Tsukuba 305-0801, Japan
3 shared publications
Latest Publications
- Open Access
Systematic Design of Crystal Structure for Hofmann-Like Spin Crossover Fe(L)2[Ag(CN)2]2 Complexes
The synthesis, crystal structures, and magnetic properties of a new two-dimensional (2D) Hofmann-like series, FeII(L)2[AgI(CN)2]2 (L = 3-cyano-4-methylpyridine (1), allyl isonicotinate (2), phenyl-isonicotinate (3), and benzyl nicotinate (4)) were studied. These compounds have a 2D sheet structure because of their strongly determinate self-assembly process. An octahedral FeII ion is coordinated with the nitrogen atoms of[AgI(CN)2 linear units at equatorial positions and monodentate pyridine derivatives at the axial position. The layers construct a parallel stacking array. Compounds 1–3 show pairs of layers constructed by intermetallic Ag···Ag interactions. Compound 4 shows a mono-layer structure. The substituent bulk of the ligands affects the interlayer space. Compounds 1–4 undergo a 100% spin transition. However, compound 1, incorporating a smaller group, has a relatively lower critical temperature (Tc = 182 K (1), Tc = 221 K (2), Tc = 227 (3) and Tc1 = 236 K, Tc2 = 215 K (4)). We investigated the correlations between our systematic crystal design, substituent size, and the spin crossover profiles.
Open AccessSystematic Design of Crystal Structure for Hofmann-Like Spin Crossover Fe(L)2[Ag(CN)2]2 Complexes
The synthesis, crystal structures, and magnetic properties of a new two-dimensional (2D) Hofmann-like series, FeII(L)2[AgI(CN)2]2 (L = 3-cyano-4-methylpyridine (1), allyl isonicotinate (2), phenyl-isonicotinate (3), and benzyl nicotinate (4)) were studied. These compounds have a 2D sheet structure because of their strongly determinate self-assembly process. An octahedral FeII ion is coordinated with the nitrogen atoms of[AgI(CN)2 linear units at equatorial positions and monodentate pyridine derivatives at the axial position. The layers construct a parallel stacking array. Compounds 1–3 show pairs of layers constructed by intermetallic Ag···Ag interactions. Compound 4 shows a mono-layer structure. The substituent bulk of the ligands affects the interlayer space. Compounds 1–4 undergo a 100% spin transition. However, compound 1, incorporating a smaller group, has a relatively lower critical temperature (Tc = 182 K (1), Tc = 221 K (2), Tc = 227 (3) and Tc1 = 236 K, Tc2 = 215 K (4)). We investigated the correlations between our systematic crystal design, substituent size, and the spin crossover profiles.
- Open Access
New Iron(II) Spin Crossover Complexes with Unique Supramolecular Networks Assembled by Hydrogen Bonding and Intermetallic Bonding
Two spin crossover (SCO) coordination polymers assembled by combining FeII octahedral ion, 4-cyanopyridine (4-CNpy) and [Au(CN)2]− liner unit are described. These compounds, Fe(4-CNpy)2[Au(CN)2]2·1/2(4-CNpy) (1a) and {Fe(4-CNpy)2[Au(CN)2]2}-{Fe(H2O)2[Au(CN)2]2} (1b), present quite different supramolecular networks that show different magnetic behaviors. Compound 1a crystallizes in the centrosymmetric space group Pbcn. The asymmetric unit contains two 4-CNpy, one type of Fe2+, and two types of crystallographically distinct [Au(CN)2]− units which form Hofmann-like two dimensional layer structures with guest spaces. The layers are combined with another layer by strong gold-gold intermetalic interactions. Compound 1b crystallizes in the centrosymmetric space group Pnma. The bent bismonodentate [AuI(CN)2] units and FeII ions form a complicated interpenetrated three dimensional structure. In addition, 1b exhibits ferromagnetic interaction.
Open AccessNew Iron(II) Spin Crossover Complexes with Unique Supramolecular Networks Assembled by Hydrogen Bonding and Intermetallic Bonding
Two spin crossover (SCO) coordination polymers assembled by combining FeII octahedral ion, 4-cyanopyridine (4-CNpy) and [Au(CN)2]− liner unit are described. These compounds, Fe(4-CNpy)2[Au(CN)2]2·1/2(4-CNpy) (1a) and {Fe(4-CNpy)2[Au(CN)2]2}-{Fe(H2O)2[Au(CN)2]2} (1b), present quite different supramolecular networks that show different magnetic behaviors. Compound 1a crystallizes in the centrosymmetric space group Pbcn. The asymmetric unit contains two 4-CNpy, one type of Fe2+, and two types of crystallographically distinct [Au(CN)2]− units which form Hofmann-like two dimensional layer structures with guest spaces. The layers are combined with another layer by strong gold-gold intermetalic interactions. Compound 1b crystallizes in the centrosymmetric space group Pnma. The bent bismonodentate [AuI(CN)2] units and FeII ions form a complicated interpenetrated three dimensional structure. In addition, 1b exhibits ferromagnetic interaction.
- 15 April 2010
- Published by American Physical Society (APS) in Physical Review B
- Vol. 81 (14) , 144417
Interface structure of half-metallic Heusler alloythin films facing an MgO tunnel barrier determined by x-ray magnetic circular dichroismUsing x-ray absorption spectroscopy and x-ray magnetic circular dichroism, we performed an element-specific investigation of the spin magnetic moments of Mn and Co of ultrathin layers grown on an Fe underlayer to stabilize the ferromagnetism and facing an MgO barrier. The experimentally observed dependence of the values of Co and Mn on the layer thickness in the ultrathin region is qualitatively in good agreement with the one theoretically obtained for a MnSi-terminated interface of the layer facing an MgO barrier. This clarification would provide a strong basis for further advancement of applications of half-metallic Heusler alloy electrodes into spintronic devices.- 15 April 2010
- Published by American Physical Society (APS) in Physical Review B
- Vol. 81 (14) , 144417
Interface structure of half-metallic Heusler alloythin films facing an MgO tunnel barrier determined by x-ray magnetic circular dichroismUsing x-ray absorption spectroscopy and x-ray magnetic circular dichroism, we performed an element-specific investigation of the spin magnetic moments of Mn and Co of ultrathin layers grown on an Fe underlayer to stabilize the ferromagnetism and facing an MgO barrier. The experimentally observed dependence of the values of Co and Mn on the layer thickness in the ultrathin region is qualitatively in good agreement with the one theoretically obtained for a MnSi-terminated interface of the layer facing an MgO barrier. This clarification would provide a strong basis for further advancement of applications of half-metallic Heusler alloy electrodes into spintronic devices.- 12 March 2009
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 82 (3) , 347-351
Structural Isomers of {MnII(L)2[AgI(CN)2]2} (L = 3-Methylpyridine or 4-Methylpyridine), Bilayer Structure with Binuclear Argentophilic Interaction and Interpenetrated Structure with 1D Chain Argentophilic Interaction; Synthesis, Crystal Structure, and Magnetic Properties
- 12 March 2009
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 82 (3) , 347-351
Structural Isomers of {MnII(L)2[AgI(CN)2]2} (L = 3-Methylpyridine or 4-Methylpyridine), Bilayer Structure with Binuclear Argentophilic Interaction and Interpenetrated Structure with 1D Chain Argentophilic Interaction; Synthesis, Crystal Structure, and Magnetic Properties
- 3 March 2008
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 103 (7) , 07D712
Electronic and magnetic properties of Heusler alloy Co2MnSi epitaxial ultrathin films facing a MgO barrier studied by x-ray magnetic circular dichroism
The electronic and magnetic states of an epitaxially grown full-Heusler alloy (CMS) (4 ML) thick ultrathin film and a CMS -thick film both facing an epitaxial MgO(001) tunnel barrier were element-specifically studied by means of x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD). The observed XAS and XMCD spectra revealed that both the CMS films were not oxidized. The Co and Mn spin magnetic moments for the 4 ML thick CMS film obtained by applying the sum rules were close to those for the -thick one and the theoretical values for bulk CMS with the structure. These results indicate that 4 ML thick CMS ultrathin films facing a MgO barrier still retain the electronic and magnetic states for the structure.- 3 March 2008
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 103 (7) , 07D712
Electronic and magnetic properties of Heusler alloy Co2MnSi epitaxial ultrathin films facing a MgO barrier studied by x-ray magnetic circular dichroism
The electronic and magnetic states of an epitaxially grown full-Heusler alloy (CMS) (4 ML) thick ultrathin film and a CMS -thick film both facing an epitaxial MgO(001) tunnel barrier were element-specifically studied by means of x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD). The observed XAS and XMCD spectra revealed that both the CMS films were not oxidized. The Co and Mn spin magnetic moments for the 4 ML thick CMS film obtained by applying the sum rules were close to those for the -thick one and the theoretical values for bulk CMS with the structure. These results indicate that 4 ML thick CMS ultrathin films facing a MgO barrier still retain the electronic and magnetic states for the structure.- 24 December 2007
- Published by AIP Publishing in Applied Physics Letters
- Vol. 91 (26) , 262502
X-ray absorption spectroscopy and x-ray magnetic circular dichroism of epitaxially grown Heusler alloy Co2MnSi ultrathin films facing a MgO barrier
We element specifically studied the electronic and magnetic states of epitaxially grown full-Heusler alloy (CMS) (4 ML) thick ultrathin films facing an epitaxial MgO(001) tunnel barrier by means of x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD). In situ reflection high-energy electron-diffraction observations indicated that the CMS films grew into the structure. The observed XAS and XMCD spectra revealed that the CMS ultrathin film was not oxidized. The ratio of Mn and Co spin magnetic moments obtained by applying the sum rules was about 2.7, close to a theoretical value of 2.8 for CMS with the structure.- 24 December 2007
- Published by AIP Publishing in Applied Physics Letters
- Vol. 91 (26) , 262502
X-ray absorption spectroscopy and x-ray magnetic circular dichroism of epitaxially grown Heusler alloy Co2MnSi ultrathin films facing a MgO barrier
We element specifically studied the electronic and magnetic states of epitaxially grown full-Heusler alloy (CMS) (4 ML) thick ultrathin films facing an epitaxial MgO(001) tunnel barrier by means of x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD). In situ reflection high-energy electron-diffraction observations indicated that the CMS films grew into the structure. The observed XAS and XMCD spectra revealed that the CMS ultrathin film was not oxidized. The ratio of Mn and Co spin magnetic moments obtained by applying the sum rules was about 2.7, close to a theoretical value of 2.8 for CMS with the structure.- 17 January 2004
- Published by Elsevier in Journal of Magnetism and Magnetic Materials
- Vol. 272-276, 1319-1320
Long relaxation phenomena studied by measurements of dynamic susceptibility in a weak random anisotropy magnet
- 17 January 2004
- Published by Elsevier in Journal of Magnetism and Magnetic Materials
- Vol. 272-276, 1319-1320
Long relaxation phenomena studied by measurements of dynamic susceptibility in a weak random anisotropy magnet