研究成果報告書

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Fe 4 N (1) 3d MBE (2) AMR (3) BiFeO 3 150 C/cm 2 Fe 4 N > 400 Fe 0 0.7 M MTJ T TMR (4) MTJ Fe 4 4N Fe 4 N BiFeO 3 Fe 4 4N Fe N N Fe 4 N Mn 4 N Fe 4 N MTJ J Co x Fe 4-x N, Ni x Fe 4-x N x = 0 T TMR ~ 4, Co x Mn 4-x Nx = 0, 0.2, Mn x Fe 4-x N x = 3, 4 Fe 4 N AMR Fe 4 N Mn 4 N ( SrTiO 3 Mg go ) ) Co x Fe 4-x N, Fe 4 N-Co 4 N Ni x Fe 4-x N Co, Ni Co 3 FeN 2K K Fe 4 N Ni x Fe 4-x N Fe 4 N Ni 4 N 2K 1Fe Mn +0.75Fe e Co 3 Fe Fe 4 N Fe 4 N N Ni x Fe 4-x N

Ni 3 FeN T C T C = 266K Co x Fe 4-x N Co 0.2 Mn 3.8 N Mn 4 N Mn 4 N 25% 10%Mn 3 FeN M Mn 4 N 10% Fe4N AM MR 50 K 2 C2 4 C4 d C4 50K Fe 4 N AM MR d xy z x xy x cos 2 x s-d d x x x cos s 2 2 4 C4 AMR C2, C4 50K K Fe4N transverse-amr Tr-AM MR Tr-AMR AMR x yz Tr-A AMR cos 2 Fe4N N Tr- -AMR C2 C4 300K~50K C2 50 AHE AMR A AHE Fe4N N AH AHH 300K 50K 50K A AMR eg g Fe 4 4N

t2 2g Mn 4 N AMR AHE Fe 4 N 100 0K Co x Fe 4-x N, Ni x Fe 4 4-xN, Mn 4 N AMR Mn 4 N MgAl 2 O 4 (a)mgo Fe (b)si Fe 4 N 20 nm MgAl 2 O 4 in-plane XRD MgO[200] MgO[ [220] MgAl 2 O 4 MgAl l 2 O 4 MgAl 2 O 4 Fe F Fe 4 N M MgAl 2 O 4 >350 MTJ TMR Fe Fe 4 N M MTJ TMR R Fe 4 N(CoFe 3 N) 9 BaTi io 3 13 BaTiO 3 Fe 4 N/BaTiO 3 CoFe 3 N/ /BaTiO 3 Fe 2 N/TiO BaTiO 3 ~0.025e/Fe-a atom Fe 4 N/BaTiO 3 CoFe 3 N/BaTiO 3 1.37μ B 1 1.34μ B Fe Fe( ( ) Fe 4 NCoFe 3 N Fe MgAl 2 O 4 XRD D (Fe or Fe 4 N)/MgAl 2 O 4 /CoFeB Fe e MTJ Fe 4 N MTJ TMR R TMR TMR TMR > 200% 70% TMR SrTiO 3 BaTiO 3 C CoFe 3 N/BaTiO 3 / CoFe 3 N 24 K. Kabara, M. Tsunoda, and S. Kokado, "Magneto-transport properties of pseudo- single-crystall Mn 4 N thin films",, AIP Advances 7 (2017) 056416. (DOI: 10.1063/1.4974065)

F. Takata, K. Kabara, K. Ito, M. Tsunoda, T. Suemasu, "Negative anisotropic magnetoresistance resulting from minority spin transport in Ni x Fe 4-x N (x = 1 and 3) epitaxial films",, Journal of Applied Physics 121 (2017) 023903. (DOI:10.1063/ 1.4974002),,, " ",, 11 (2016) 125. S. Kokado, Y. Sakuraba, and M. Tsunoda, "Spin polarization ratios of resistivity and density of states estimated from anisotropic magnetoresistance ratio for nearly halfmetallic ferromagnets",, Jpn. J. Appl. Phys. 55 (2016) 108004. (DOI:10.7576/ JJAP.55108004) F. Takata, K. Ito, S. Higashikozono, T. Gushi, K. Toko, T. Suemasu, "Epitaxial growth and magnetic properties of Ni x Fe 4-x N (x = 0, 1, 3, and 4) films on SrTiO 3 (001) substrates",, Journal of Applied Physics 120 (2016) 083907. (DOI: 10.1063/1.4961734) S. Isogami and M. Tsunoda, "Enhanced inverse spin-hall voltage in (001) oriented Fe 4 N/Pt polycrystalline films without contribution of planar-hall effect",, Japanese Journal of Applied Physics 55 (2016) 043001. (DOI:10.7567/JJAP.55. 043001) K. Ito, Y. Yasutomi, K. Kabara, T. Gushi, S. Higashikozono, K. Toko, M. Tsunoda, and T. Suemasu, "Perpendicular magnetic anisotropy in Co x Mn 4-x N (x = 0 and 0.2) epitaxial films and possibility of tetragonal Mn 4 N phase,",, AIP Advances 6 (2016) 056201. (DOI:10.1063/1.4942548) K. Kabara, M. Tsunoda, and S. Kokado, "Anomalous Hall effects in pseudo-singlecrystal γ'-fe 4 N thin films",, AIP Advances 6 (2016) 055801. (DOI:10.1063/ 1.4942550) K. Kabara, M. Tsunoda, and S. Kokado, "Transverse anisotropic magnetoresistance effects in pseudo-single-crystal γ'-fe 4 N thin films",, AIP Advances 6 (2016) 055818. (DOI:10.1063/1.4943923) K. Ito, T. Sanai, Y. Yasutomi, T. Gushi, K. Toko, H. Yanagihara, M. Tsunoda, E. Kita, and T. Suemasu, "Mossbauer study on epitaxial Co x Fe 4-x N films grown by molecular beam epitaxy",, Journal of Applied Physics 117 (2015) 17B717. (DOI:10.1063 /1.4914342) S. Kokado and M. Tsunoda, "Twofold and Fourfold Symmetric Anisotropic Magnetoresistance Effect in A Model with Crystal Field",, J. Phys. Soc. Jpn. 84 (2015) 094710. (DOI:10.7566/JPSJ.84.094710) K. Kabara and M. Tsunoda, "Perpendicular magnetic anisotropy of Mn 4 N films fabricated by reactive sputtering mthod",, J. Appl. Phys. 117 (2015) 17B512. (DOI: 10.1063/1.4913730) M. Tsunoda, R. Chiba, and K. Kabara, "Fabrication of MgAl 2 O 4 tunnel barrier by radio frequency sputtering method and magnetoresistance effect through it with Fe or Fe 4 N ferromagnetic electrode",, J. Appl. Phys. 117 (2015) 17D703. (DOI: 10.1063/1.4906762) K. Ito, K. Kabara, T. Sanai, K. Toko, Y. Imai, M. Tsunoda, and T. Suemasu, "Sign of the spin-polarization in cobalt-iron nitride films determined by the anisotropic magnetoresistance effect",, J. Appl. Phys. 116 (2014) 053912. (DOI:10.1063/ 1.4892179) S. Kokado and M. Tsunoda, "Anisotropic magnetoresistance effect of a strong ferromagnet: magnetization direction dependence in a model with crystal field",, phys. stat. solidi (c) 11 (2014) 1026. (DOI:10.1002/pssc.201300736) K. Kabara, M. Tsunoda, and S. Kokado, "Annealing effects on nitrogen site ordering and anisotropic magnetoresistance in pseudo-single-crystal γ'-fe 4 N films",, Appl. Phys. Express 7 (2014) 063003. (DOI:10.7567/APEX.7.063003) S. Isogami, M. Tsunoda, M. Oogane, A. Sakuma, and M. Takahashi, "Dependence of Magnetic Damping on Temperature and Crystal Orientation in Epitaxial Fe 4 N Thin Films",, J. Magn. Soc. Jpn. 38 (2014) 162. (DOI: 10.3379/msjmag.1406R001) 66 S. Kokado, Y. Sakuraba, M. Tsunoda, "Relational expression between spin polarization ratio and anisotropic magnetoresistance ratio for nearly half-metallic ferromagnets", 81st DPG Spring Meeting, 2017 3 20,,, "CoFe 3 N/BaTiO 3 ", 64, 2017 3 14,,,,,,, " Mn x Fe 4-x N ", 64, 2017 3 14,,,, " ", 2, 2017 2 20,

S. Kokado and M. Tsunoda, " Intuitive Explanation of Anisotropic Magnetoresistance (AMR) Effect and Necessary Condition for Half-Metallic Ferromagnet Negative AMR ", Seminar at Department of Physics, Tsinghua University, 2017 1 6, K. Kabara, M. Tsunoda, and S. Kokado, "Magneto-transport properties of pseudo-single-crystal Mn 4 N thin films", 61st Annual Conference on Magnetism and Magnetic Materials, 2016 11 4, S. Isogami, "Dependence of spin dynamics on nitrogen site ordering in Fe 4 N thin films", 61st Annual Conference on Magnetism and Magnetic Materials, 2016 11 3, S. Kokado and M. Tsunoda, " Theoretical Study on Anisotropic Magnetoresistance Effects in Ferromagnets", International Symposium on Innovative Materials and Physics, 2016 11 22, " Fe 4 N ", 40 2016 9 8, M. Tsunoda, K. Kabara, and S. Kokado, "Low temperature anomalies of galvano-magnetic effects in γ'-fe 4 N thin films", 8th Joint European Magnetic Symposia, 2016 8 23, M. Tsujikawa, Y. Masuzawa, M. Shirai, "First-principles study on the electronic and magnetic properties of BiFeO 3 and Bi(Fe,Co)O 3 ", 2016 Japan & France joint workshop, 2016 5 20,. S. Kokado, M. Tsunoda, "Twofold and Fourfold Symmetric Anisotropic Magnetoresistance Effect in a Model with Crystal Field", DPG Spring Meeting 2016, 2016 3 8, K. Kabara, M. Tsunoda, S. Kokado, "Anomalous Hall effect in pseudo-singlecrystal γ'-fe 4 N thin films", 13th Joint MMM-Intermag Conference, 2016 1 15, S. Isogami and M. Tsunoda, "Enhanced spin-hall voltage in Fe 4 N/Pt bilayer films", 13th Joint MMM-Intermag conference, 2016 1 14, K. Kabara, M. Tsunoda, S. Kokado, "Transverse anisotropic magnetoresistance effects in pseudo-single-crystal γ'-fe 4 N thin films", 13th Joint MMM-Intermag Conference, 2016 1 14, K. Ito, Y. Yasutomi, K. Kabara, T. Gushi, S. Higashikozono, K. Toko, M. Tsunoda, and T. Suemasu, "Perpendicular magnetic anisotropy of Co x Mn 4-x N (x = 0 and 0.2) epitaxial films on SrTiO 3 (001) substrates", 13th Joint MMM-Intermag Conference,2016 1 12,,,, " Fe 4 N ",, 2015 10 22,,, " Fe 4 N ",, 2015 6 6, Y. Sakuraba, S. Kokado, Y. Hirayama, T. Furubayashi, H. Sukegawa, S. Li, Y. K. Takahashi, and K. Hono, " Novel approach to investigate spin-polarization in half-metallic Heusler compounds via anisotropic magnetoresistance effect", 59th Annual MMM Conference, 2014 11 4,,, "(Fe,Co) 4 N ", 38, 2014 9 4,

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