Magnetic study on novel organic ferromagnetic semiconductors

• Project/Area Number: 17540336
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Osaka Prefecture University
• Principal Investigator: NOGUCHI Satoru Osaka Prefecture University, Graduate School of Engineering, Associate Professor, 工学研究科, 教授 (70180718)
• Co-Investigator(Kenkyū-buntansha): ISHIDA Takekazu Osaka Prefecture University, Graduate School of Engineering, Professor, 工学研究科, 教授 (00159732) ; SUGIMOTO Toyonari Osaka Prefecture University, Graduate School of Science, Professor, 理学研究科, 教授 (30093256)
• Project Period (FY): 2005 – 2006
• Project Status: Completed (Fiscal Year 2006)
• Budget Amount: ¥3,500,000 (Direct Cost: ¥3,500,000); Fiscal Year 2006: ¥1,300,000 (Direct Cost: ¥1,300,000); Fiscal Year 2005: ¥2,200,000 (Direct Cost: ¥2,200,000)
• Keywords: organic magnetic semiconductors / ferromagnetism / antiferromagnetism / high field magnetization / magnetoconductance / 有機磁性半導体

Research Abstract

1)We present clear evidence for ferromagnetic ordering in the magnetization data of (BEDT-TTFVS)・FeBr_4, which was newly synthesized as a semiconducting 1:1 charge-transfer salt. Magnetization data obtained by a resonant circuit method show a magnetic transition temperature of 1.9±0.3 K, and a hysteresis loop below 1.5 K. An additional magnetization jump at 0.2 T was clearly observed below 1.9 K, suggesting that the salt shows a canted ferromagnetism.
2)We observed magnetic orderings of Fe^<3+> d spins in the 1:1 salts of BEDT-TTFVS(O) with FeX_4 (X=Br,Cl) ions by magnetization measurements up to 0.5 T in the temperature range down to 0.4 K using a homemade pulsed magnet system combined with a ^3He cryostat. Although temperature dependences of the magnetic susceptibilities above 20 K obeyed a Curie-Weiss law with positive Weiss temperatures, the salts were not subjected to ferromagnetic ordering but to antiferromagnetic orderings except for (BEDT-TTFVS)・FeBr_4. The Neel temperatures, T_N were determined to be 2.4, 1.0 and 0.8 K for (BEDT-TTFV0)・FeBr_4, (BEDT-TTFVO)・FeCl_4 and (BELMTTFVS)・FeCl_4, respectively. Below T_N, a clear magnetization jump due to the spin-flop was also observed.
3)We performed high field magnetization measurements up to 55 T for newly synthesized antiferromagnetic charge-transfer salts, (Benzo-TTFVS)_2FeBr_4 with T_N=5.8 K and (Benzo-TTFVO)_2FeBr_4 with T_N=9.3 K A spin-flop behavior at 1.8 T and a saturation at 14.8 T were observed in the magnetization curve at 0.5 K for the (Benzo-TTFVS)_2FeBr_4 salt. For the (Benzo-TTFV0)_2FeBr_4 salt a spin-flop at 6.9 T and a saturation at 36.2 T were observed. We estimate the exchange interaction between d spins and the magnetic anisotropy for both salts from the magnetization data.

Research Products

• [Journal Article] Magnetic orderings of Fe^<3+> d spins in the 1 : 1 salts of BEDT-TTFVS(O) with FeX_4^-(X=Br, Cl) ions (2007)
  • Author(s): S.Noguchi, A.Kuribayashi, M.Wang, H.Fujiwara, T.Sugimoto, T.Ishida
  • Journal Title: J. Magn. Magn. Mater. 310 Pages: 1087-1089
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Antiferromagnetic or canted antiferromagnetic orderings of Fe(III) d spins of FeX_4^- ions in BEDT-TTFVO(S)・FeX_4 (X=Cl, Br) [BEDT-TTFVO(S)=bis(ethylenedithio)tetrathiafulvalenoquinone (-thioquinone)-1,3-dithiolemethide] (2007)
  • Author(s): M.Wang, X.Xiao, H.Fujiwara, T.Sugimoto, S.Noguchi, T.Ishida, T.Mori, H.Aruga Katori
  • Journal Title: Inorganic Chemistry 46 Pages: 3049-3056
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Metal-semiconductor structural phase transitions and antiferromagnetic orderings in (Benzo-TTFVO)_2・MX_4 (M=Fe, Ga; X=Cl, Br) salts (2007)
  • Author(s): T.Hiraoka, H.Fujiwara, T.Sugimoto, H.Nakazumi, S.Noguchi, A.Kuribayashi, T.Ishida, K.Yokogawa, K.Murata, T.Mori, H.Aruga Katori, S.Kimura, M.Hagiwara
  • Journal Title: Journal of Materials Chemistry 17 (未定) Pages: 1664-1673
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Magnetic orderings of Fe^<3+> d spins in the 1:1 salts of BEDT-TTFVS(O) with FeX_4 (X=Br,Cl) ions (2007)
  • Author(s): S.Noguchi, A.Kuribayashi, M.Wang, H.Fujiwara, T.Sugimoto, T.Ishida
  • Journal Title: Journal of Magnetism and Magnetic Materials Vol.310 Pages: 1087-1089
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Antiferromagnetic or canted antiferromagnetic orderings of Fe(III) d spins of FeX_4- ions in BEDT-TTFVO(S)・FeX_4 (X=Cl,Br)[BEDT-TTFVO(S)=bis(ethylenedithio)tetrathiafulvalenoquinone(-thioquinone)-1,3-dithiolemethide] (2007)
  • Author(s): M.Wang, X.Xiao, H.Fujiwara, T.Sugimoto, S.Noguchi, T.Ishida, T.Mori, H.Aruga Katori
  • Journal Title: Inorganic Chemistry Vol.46 Pages: 3049-3056
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Metal-semiconductor structural phase transitions and antiferromagnetic orderings in (Benzo-TTFVO)_2・MX_4(M=Fe,Ga;X=Cl,Br) salts (2007)
  • Author(s): T.Hiraoka, H.Fujiwara, T.Sugimoto, H.Nakazumi, S.Noguchi, A.Kuribayashi, T.Ishida, K.Yokogawa, K.Murata, T.Mori, H.Aruga Katori, S.Kimura, M.Hagiwara
  • Journal Title: Journal of Materials Chemistry Vol.17 Pages: 1664-1673
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Magnetic orderings of Fe^<3+> d spins in the 1 : 1 salts of BEDT-TTFVS(O) with FeX_4^-(X=Br,Cl)ions (2007)
  • Author(s): S.Noguchi, A.Kuribayashi, M.Wang, H.Fujiwara, T.Sugimoto, T.Ishida
  • Journal Title: J.Magn.Magn.Mater. 310 Pages: 1087-1089
• [Journal Article] Antiferromagnetic or Canted Antiferromagnetic Orderings of Fe(III) d Spins of FeX_4^- Ions in BEDT-TTFVO(S)・FeX_4 (X = Cl, Br) [BEDT-TTFVO(S) = bis(ethylenedithio)tetrathiaful valenoquinone(-thioquinone)-1,3-dithiolemethide] (2007)
  • Author(s): M.Wang, X.Xiao, H.Fujiwara, T.Sugimoto, S.Noguchi, T.Ishida, T.Mori, H.Aruga Katori
  • Journal Title: Inorganic Chemistry 46 Pages: 3049-3056
• [Journal Article] Metal-semiconductor structural phase transitions and antiferromagnetic orderings in (Benzo-TTFVO)_2・MX_4(M=Fe,Ga;X=Cl,Br)salts (2007)
  • Author(s): T.Hiraoka, H.Fujiwara, T.Sugimoto, H.Nakazumi, S.Noguchi, A.Kuribayashi, T.Ishida, K.Yokogawa, K.Murata, T.Mori, H.Aruga Katori, S.Kimura, M.Hagiwara
  • Journal Title: Journal of Materials Chemistry 17 Pages: 1664-1673
• [Journal Article] A new ferromagnetic organic semiconductor (BEDT-TTFVS)・FeBr_4 (2006)
  • Author(s): S.Noguchi, T.Kosaka, M.Wang, H.Fujiwara, T.Sugimoto, T.Ishida
  • Journal Title: AIP Conference Proceedings Series 850 Pages: 1063-1064
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Magnetoresistance effects evidencing the π-d interaction in metallic organic conductors, (EDT-DSDTFVO)_2・MX_4 (M=Fe, Ga; X=Cl, Br) (2006)
  • Author(s): H.Fujiwara, T.Hayashi, T.Sugimoto, H.Nakazumi, S.Noguchi, L.Li, K.Yokogawa, S.Yasuzuka, K.Murata, T.Mori
  • Journal Title: Inorganic Chemistry 45 Pages: 5712-5714
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] A Metallic (EDT-DSDTFVSDS)_2・FeBr_4 salt : Antiferromagnetic ordering of d spins of FeBr_4^- ions and anomalous magnetoresistance due to preferential π-d interaction (2006)
  • Author(s): T.Hayashi, X.Xiao, H.Fujiwara, T.Sugimoto, H.Nakazumi, S.Noguchi, T.Fujimoto, S.Yasuzuka, H.Yoshino, K.Murata, T.Mori, H.Aruga Katori
  • Journal Title: J. American Chem. Soc. 128 Pages: 11746-11747
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] High Field Magnetization of (Benzo-TTFVS)_2FeBr_4 and (Benzo-TTFVO)_2FeBr_4 (2006)
  • Author(s): S.Noguchi, A.Kuribayashi, T.Hiraoka, H.Fujiwara, T.Sugimoto, S.Kimura, M.Hagiwara, K.Kindo, T.Ishida
  • Journal Title: J. Phys. : Conference Series 51 Pages: 331-334
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] A new ferromagnetic organic semiconductor (BEDT-TTFVS)・FeBr_4 (2006)
  • Author(s): S.Noguchi, T.Kosaka, M.Wang, H.Fujiwara, T.Sugimoto, T.Ishida
  • Journal Title: AIP Conference Proceedings Series Vol.850 Pages: 1063-1064
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Magnetoresistance effects evidencing the ^<II>-d interaction in metallic organic conductors, (EDT-DSDTFVO)_2・MX_4 (M=Fe,Ga;X=Cl,Br) (2006)
  • Author(s): H.Fujiwara, T.Hayashi, T.Sugimoto, H.Nakazumi, S.Noguchi, L.Li, K.Yokogawa, S.Yasuzuka, K.Murata, T.Mori
  • Journal Title: Inorganic Chemistry Vol.45 Pages: 5712-5714
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] A metallic (EDT-DSDTFVSDS)_2・FeBr_4 salt : antiferromagnetic orderingof d spins of FeBr_4-ions and anomalous magnetoresistance due to preferential ^<II>-d interaction (2006)
  • Author(s): T.Hayashi, X.Xiao, H.Fujiwara, T.Sugimoto, H.Nakazumi, S.Noguchi, T.Fujimoto, S.Yasuzuka, H.Yoshino, K.Murata, T.Mori, H.Aruga Katori
  • Journal Title: Journal of the American Chemical Society Vol.128 Pages: 11746-11747
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] High field magnetization of (Benzo-TTFVS)_2FeBr_4 and (Benzo-TTFVO)_2FeBr_4 (2006)
  • Author(s): S.Noguchi, A.Kuribayashi, T.Hiraoka, H.Fujiwara, T.Sugimoto, S.Kimura, M.Hagiwara, K.Kindo, T.Ishida
  • Journal Title: Journal of Physics : Conference Series Vol.51 Pages: 331-334
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] A new ferromagnetic organic semiconductor(BEDT-TTFVS)・FeBr_4 (2006)
  • Author(s): S.Noguchi, T.Kosaka, m.Wang, H.Fujiwara, T.Sugimoto, T.Ishida
  • Journal Title: AIP Conference Proceedings Series 850 Pages: 1063-1064
• [Journal Article] Magnetoresistance effects evidencing the π-d interaction in metallic organic conductors,(EDT-DSDTFVO)_2・MX_4(M=Fe,Ga;X=Cl,Br) (2006)
  • Author(s): H.Fujiwara, T.Hayashi, T.Sugimoto, H.Nakazumi, S.Noguchi, L.Li, K.Yokogawa, S.Yasuzuka, K.Murata, T.Mori
  • Journal Title: Inorganic Chemistry 45 Pages: 5712-5714
• [Journal Article] A Metallic (EDT-DSDTFVSDS)_2・FeBr_4 Salt : Antiferromagnetic Ordering of d Spins of FeBr_4^- Ions and Anomalous Magnetoresistance Due to Preferential π-d Interaction (2006)
  • Author(s): T.Hayashi, X.Xiao, H.Fujiwara, T.Sugimoto, H.Nakazumi, S.Noguchi, T.Fujimoto, S.Yasuzuka, H.Yoshino, K.Murata, T.Mori, H.Aruga Katori
  • Journal Title: J.American Chem. Soc. 128 Pages: 11746-11747
• [Journal Article] High Field Magnetization of (Benzo-TTFVS)_2FeBr_4 and (Benzo-TTFVO)_2FeBr_4 (2006)
  • Author(s): S.Noguchi, A.Kuribayashi, T.Hiraoka, H.Fujiwara, T.Sugimoto, S.Kimura, M.Hagiwara, K.Kindo, T.Ishida
  • Journal Title: J.Phys. : Conference Series 51 Pages: 331-334
• [Journal Article] A new ferromagnetic organic semiconductor (BEDT-TTFVS)・FeBr_4 (2006)
  • Author(s): S.Noguchi, T.Kosaka, M.Wang, H.Fujiwara, T.Sugimoto, T.Ishida
  • Journal Title: AIP Conference Proceedings Series
• [Journal Article] Ferromagnetic ordering of Fe(III) d spins of FeBr_4^- ions in (Ethylenedithiotetrathiafulvalenothioquinone-ethylenedithio-1,3-dithiolemethide)・FeBr_4 (2005)
  • Author(s): M.X.Wang, H.Fujiwara, T.Sugimoto, S.Noguchi, T.Ishida
  • Journal Title: Inorganic Chemistry 44 Pages: 1184-1186
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Metallic/semiconducting behaviors and antiferromagnetic ordering of FeBr_4^- d spins in (Benzo-TTFVS)_2・MX_4 (M=Fe, Ga; X=C1, Br) (2005)
  • Author(s): T.Hiraoka, Y.Kamada, T.Matsumoto, H.Fujiwara, T.Sugimoto, S.Noguchi, T.Ishida, H.Nakazumi, H.Aruga Katori
  • Journal Title: Journal of Materials Chemistry 15 Pages: 3479-3487
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Ferromagnetic ordering of Fe(III) d spins of FeBr_4 ions in (ethylene dithiotetrathiafulvalenothioquinone-ethylenedithio-1,3-dithiolemethide)・FeBr_4 (2005)
  • Author(s): M.Wang, H.Fujiwara, T.Sugimoto, S.Noguchi, T.Ishida
  • Journal Title: Inorganic Chemistry Vol.44 Pages: 1184-1186
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Metallic/semiconducting behaviors and antiferromagnetic ordering of FeBr_4 d spins in (Benzo-TTFVS)_2・MX_4(M=Fe,Ga;X=Cl,Br) (2005)
  • Author(s): T.Hiraoka, Y.Kamada, T.Matsumoto, H.Fujiwara, T.Sugimoto, S.Noguchi, T.Ishida, H.Nakazumi, H.Aruga Katori
  • Journal Title: Journal of Materials Chemistry Vol.15 Pages: 3479-3487
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Ferromagnetic ordering of Fe(III) d spins of FeBr_4^- ions in (Ethylenedithiotetrathiafulvalenothioquinone-ethylenedithio-1,3-dithiolemethide) ・FeBr_4 (2005)
  • Author(s): M.X.Wang, H.Fujiwara, T.Sugimoto, S.Noguchi, T.Ishida
  • Journal Title: Inorganic Chemistry 44 Pages: 1184-1186
• [Journal Article] Metallic/semiconducting behaviors and antiferromagnetic ordering of FeBr_4^- d spins in (Benzo-TTFVS)_2 ・MX_4 (M = Fe, Ga ; X = Cl, Br) (2005)
  • Author(s): T.Hiraoka, Y.Kamada, T.Matsumoto, H.Fujiwara, T.Sugimoto, S.Noguchi, T.Ishida, H.Nakazumi, H.Aruga Katori
  • Journal Title: Journal of Materials Chemistry 15 Pages: 3479-3487