[発表論文]

1. "Terahertz broadband one-way transparency with spontaneous magnon decay", M. Akaki, M. Matsumoto, Y. Narumi, S. Okubo, H. Ohta, and M. Hagiwara: Sci. Adv. 11, eado6783 (2025).

2. "Magnetic structure and magnetoelectric properties of the spin-flop phase in LiFePO4", S. H.-Janas, M. Akaki, E. Fogh, T. Kihara, M. D. Le, P. C. Forino, S. E. Nikitin, T. Fennell, A. Painganoor, D. Vaknin, M. Watanabe, N. B. Christensen, H. Nojiri, and R. T.-Petersen: Phys. Rev. B 109, 174413 (2024). Editors' Suggestion

3. "Field-induced electric polarization and elastic softening caused by parity-mixed d-p hybridized states with electric multipoles in Ba2CuGe2O7", R. Kurihara, Y. Sato, A. Miyake, M. Akaki, K. Mitsumoto, M. Hagiwara, H. Kuwahara, and M. Tokunaga: Phys. Rev. B 109, 125129 (2024).

4. "Magnetic excitation in the S = 1/2 Ising-like antiferromagnetic chain CsCoCl3 in longitudinal magnetic fields studied by high-field ESR measurements", S. Kimura, H. Onishi, K. Okunishi, M. Akaki, Y. Narumi, M. Hagiwara, K. Kindo, and H. Kikuchi: J. Phys. Soc. Jpn. 92, 094701 (2023). "Editors' Choice"

5. "Control of Multi-domain Structure in Multiferroic CaBaCo4O7 Crystal", H. Arai, T. Shirasaki, M. Akaki, H. Kuroe, and H. Kuwahara: JPS Conf. Proc. 38, 011126 (2023).

6. "Relief of spin frustration through magnetic anisotropy in the quasi-one-dimensional S=1/2 antiferromagnet Na2CuSO4Cl2",  M. Fujihala, Y. Sakuma, S. Mitsuda, A. Nakao, K. Munakata, R. A. Mole, S. Yano, D. H. Yu, K. Takehana, Y. Imanaka, M. Akaki, S. Okubo, and H. Ohta: Phys. Rev. B 105, 144410 (2022).

7. "Optical selection rules of the magnetic excitation in the S=1/2 one-dimensional Ising-like antiferromagnet BaCo2V2O8". S. Kimura, H. Onishi, A. Okutani, M. Akaki, Y. Narumi, M. Hagiwara, K. Okunishi, K. Kindo, Z. He, T. Taniyama, and M. Itoh: Phys. Rev. B 105, 014417 (2022).

8. "Nonreciprocal linear dichroism observed in electron spin resonance spectra of the magnetoelectric multiferroic Pb(TiO)Cu4(PO4)4", M. Akaki,  K. Kimura, Y. Kato, Y. Sawada, Y. Narumi, H. Ohta, T. Kimura, Y. Motome, and M. Hagiwara: Phys. Rev. Research 3, L042043 (2021).

9. "Hepta-coordinated Ni(II) assemblies - structure and magnetic studies", M. Reczyński, M. Akaki, T. Fukuda, Y. Sawada, K. Nishii, M. Hagiwara, W. Nitek, B. Sieklucka  and  B. Nowicka:  Dalton Trans. 50, 5251-5261 (2021).

10. "Low-energy magnetic excitations in the mixed spin-(1/2,5/2) chain", H. Yamaguchi, Y. Iwasaki, Y. Kono, T. Okita, A. Matsuo, M. Akaki, M. Hagiwara, and Y. Hosokoshi: Phys. Rev. B 102, 060408(R) (2020).

11. "Electronic Structure of Sr3Fe2−xCoxO7−δ Studied by Photoemission and X-ray Absorption Spectroscopy", R. Naito, Y. Nakano, M. Okawa, H. Wadati, R. Nakamura, J. Tozawa, M. Akaki, H. Kuwahara, T. Sugiyama, E. Ikenaga, H. Kumigashira, E. Sakai, and T. Saitoh: JPS Conf. Proc. 30, 011073 (2020).

12. "Synthesis of a neutral mononuclear four-coordinate Co(II) complex having two halved phthalocyanine ligands that shows slow magnetic relaxations under zero static magnetic field", T. Ishizaki, T. Fukuda, M. Akaki, A. Fuyuhiro, M. Hagiwara,  and N. Ishikawa: Inog. Chem. 58, 5211–5220 (2019).

13. "Magnetoelectric behavior from cluster multipoles in square cupolas: Study of Sr(TiO)Cu4(PO4)4 in comparison with Ba and Pb isostructurals", Y. Kato, K. Kimura, A. Miyake, M. Tokunaga, A. Matsuo, K. Kindo, M. Akaki, M. Hagiwara, S. Kimura, T. Kimura, Y. Motome: Phys. Rev. B 99, 024415 (2019).

14.  "Magnetic structural unit with convex geometry: A building block hosting an exchange-striction-driven magnetoelectric coupling", K. Kimura, Y. Kato, K. Yamauchi, A. Miyake, M. Tokunaga, A. Matsuo, K. Kindo, M. Akaki, M. Hagiwara, S. Kimura, M. Toyoda, Y. Motome, and T. Kimura: Phys. Rev. Materials 2, 104415 (2018). "Editors' Suggestion"

15. "Electric dipole spin resonance in a quantum spin dimer system driven by magnetoelectric coupling", S. Kimura, M. Matsumoto, M. Akaki, M. Hagiwara, K. Kindo, and H. Tanaka: Phys. Rev. B 97, 140406 (2018).

16. "Magnetoelectric properties of Ca2CoSi2O7 studied by high-field electron spin resonance", M. Akaki, K. Kanaida and M. Hagiwara: J. Phys.: Conf. Ser. 969, 012102 (2018).

17. "Direct observation of spin-quadrupolar excitations in Sr2CoGe2O7 by high-field electron spin resonance", M. Akaki, D. Yoshizawa, A. Okutani, T. Kida, J. Romhányi, K. Penc, and M. Hagiwara: Phys. Rev. B 96, 214406 (2017).

18. "Magnetic Structure and Dielectric State in the Multiferroic Ca2CoSi2O7", M. Soda, S. Hayashida, T. Yoshida, M. Akaki, M. Hagiwara, M. Avdeev, O. Zaharko, and T. Masuda: J. Phys. Soc. Jpn. 86, 064703 (2017).

19. "NMR study on the quasi-one dimensional antiferromagnet BaCo2Si2O7", R. Uesugi, M. Akaki, M. Hagiwara, H. Kuwahara, and T. Goto: J. Phys.: Conf. Ser. 828, 012015 (2017).

20. "Magnetoelectric Behavior from S=1/2 Asymmetric Square Cupolas", Y. Kato, K. Kimura, A. Miyake, M. Tokunaga, A. Matsuo, K. Kindo, M. Akaki, M. Hagiwara, M. Sera, T. Kimura, and Y. Motome: Phys. Rev. Lett. 118, 107601 (2017).

21. "Impurity Substitution Effect on Magnetoelectric Properties of CaBaCo4O7 Crystals", R. Oda, R. Kajihara, K. Nishina, M. Akaki, H. Kuroe, and H. Kuwahara: Physics Procedia 75, 303-308 (2015).

22. "Magnetic-Field-Induced Polar Phase in Chiral Magnet CsCuCl3", A. Miyake, J. Shibuya, M. Akaki, H. Tanaka, and M. Tokunaga: Phys. Rev. B 92, 100406(R) (2015).

23. "One-Third Magnetization Plateau with a Preceding Novel Phase in Volborthite", H. Ishikawa, M. Yoshida, K. Nawa, M. Jeong, S. Krämer, M. Horvatić, C. Berthier, M. Takigawa, M. Akaki, A. Miyake, M. Tokunaga, K. Kindo, J. Yamaura, Y. Okamoto, and Z. Hiroi: Phys. Rev. Lett. 114, 227202 (2015).

24. "High Field Studies on BiFeO3 Single Crystals Grown by the Laser-Diode Heating Floating Zone Method", M. Tokunaga, M. Akaki, A. Miyake, T. Ito, and H. Kuwahara: J. Magn. Magn. Mater. 383, 259-261 (2015).

25. "Magnetic control of transverse electric polarization in BiFeO3", M. Tokunaga, M. Akaki, T. Ito, S. Miyahara, A. Miyake, H. Kuwahara, and N. Furukawa: Nat. Commun. 6, 5878 (2015).

26. "Novel multiferroic phase of CsCuCl3 in High Magnetic Fields", J. Shibuya, M. Akaki, Y. Kohama, A. Miyake, M. Tokunaga, and H. Tanaka: J. Phys.: Conf. Ser. 568, 042030 (2014).

27. "Interplay between Ferroelectric and Antiferromagnetic Phase Transitions in RbCoBr3", Y. Nishiwaki, T. Yamaguchi, M. Takashige, H. Kuroe, M. Akaki, H. Kuwahara, T. Kato, and K. Iio: J. Phys. Soc. Jpn. 83, 114708 (2014).

28. "Successive Magnetic Transitions of Ca2CoSi2O7 in High Magnetic Fields", M. Akaki, H. Kuwahara, A. Matsuo, K. Kindo, and M. Tokunaga: J. Phys. Soc. Jpn. 83, 093704 (2014).

29. "Magnetic properties of chalcopyrite Cu1-xFeS2 at low temperatures", K. Kobayashi, Y. Azuma, K. Kawashima, K. Horigane, M. Akaki, M. Tokunaga, and J. Akimitsu: JPS Conf. Proc. 3, 017020 (2014).

30. "Magnetoelectric Effects in Mono-domain Crystals of BiFeO3", M. Tokunaga, M. Akaki, H. Kuwahara, T. Ito, A. Matsuo, and K. Kindo: JPS Conf. Proc. 3, 014038 (2014). 

31. "Magnetic and Dielectric Properties in Multiferroic Cu3Mo2O9 under High Magnetic Fields", H. Kuroe, K. Aoki, R. Kino, T. Sato, H. Kuwahara, T. Sekine, T. Kihara, M. Akaki, Y. Kohama, M. Tokunaga, A. Matsuo, K. Kindo, M. Hase, K. Takehana,H. Kitazawa, K. Oka, T. Ito, and H. Eisaki: JPS Conf. Proc. 3, 014036 (2014).

32. "Reduction of critical field for magnetic and orbital-ordering phase transition in impurity-substituted Nd0.45Sr0.55MnO3 crystal", Y. Izuchi, M. Akaki, D. Akahoshi, and H. Kuwahara: APL Materials 2, 022106 (2014). 

33. "Anisotropic magnetic properties in åkermanite Sr2MSi2O7 (M=Co, Mn) crystals", M. Akaki, T. Tadokoro, T. Kihara, M. Tokunaga, and H. Kuwahara: J. Korean Phys. Soc. 62, 1812-1814 (2013). 

34. "Thermal, dielectric, and magnetic properties in multiferroic Cu2.85Zn0.15Mo2O9", H. Kuroe, K. Aoki, R. Itoh, T. Hosaka, T. Hasegawa, S. Hachiuma, M. Akaki, H. Kuwahara, and T. Sekine: J. Korean Phys. Soc. 63, 428-432 (2013). 

35. "Control of coexisting ferroelectric phases in RMnO3 crystals with fine tuning of 4f moment", T. Tadokoro, M. Akaki, N. Kano, H. Kuroe, T. Sekine, and H. Kuwahara: J. Korean Phys. Soc. 63, 504-507 (2013).

36. "Low-Temperature Thermoelectric Properties of the Electron-Doped Perovskites Sr1-xCaxTi1-yNbyO3", T. Okuda, J. Fukuyodo, K. Narikiyo, M. Akaki, and H. Kuwahara: J. Korean Phys. Soc. 63, 542-545 (2013).

37. "Magnetic control of electric polarization in the noncentrosymmetric compound (Cu,Ni)B2O4", N. D. Khanh, N. Abe, K. Kubo, M. Akaki, M. Tokunaga, T. Sasaki, and T. Arima: Phys. Rev. B 87, 184416 (2013).

38. "High Magnetic Field Dependence of Magnetodielectric Properties in Sr2CoSi2O7 Crystal", M. Akaki, T. Tadokoro, T. Kihara, M. Tokunaga, and H. Kuwahara: J. Low Temp. Phys. 170, 291-295 (2013).

39. "Magnetoelectric property in 3d transition metal oxide with tetrahedral structure", H. Iwamoto, M. Ehara, M. Akaki, and H. Kuwahara: J. Phys.: Conf. Ser. 400, 032031 (2012).

40. "Anisotropic magneto-transport properties of layered perovskite Sr3Fe2-xCoxO7-d crystals", R. Nakamura, J. Tozawa, M. Akaki, D. Akahoshi, K. Itatani, and H. Kuwahara: J. Phys.: Conf. Ser. 400, 032060 (2012).

41. "Multiferroic properties of an åkermanite Sr2CoSi2O7 single crystal in high magnetic fields", M. Akaki, H. Iwamoto, T. Kihara, M. Tokunaga, and H. Kuwahara: Phys. Rev. B 86, 060413(R) (2012).

42. "Thermoelectric Properties of the Electron-Doped Perovskites Sr1−xCaxTi1−yNbyO3", J. Fukuyado, K. Narikiyo, M. Akaki, H. Kuwahara, and T. Okuda: Phys. Rev. B 85, 075112 (2012).

43. "Magnetic and transport properties of quasi two-dimensional ferromagnet Sr3Fe2−xCoxO7−δ (x = 0.2 and 0.5)", D. Akahoshi, J. Tozawa, R. Nakamura, M. Akaki, and H. Kuwahara: J. Phys. Soc. Jpn. 80, 124702 (2011).

44. "Ferromagnetic Behavior of (Fe1-yZny)2Mo3O8 (0<y<1) Induced by Nonmagnetic Zn Substitution", S. Nakayama, R. Nakamura, M. Akaki, D. Akahoshi, and H. Kuwahara: J. Phys. Soc. Jpn. 80, 104706 (2011).

45. "Anomalous Coexistence of Ferroelectric Phases (P // a and P // c) in Orthorhombic Eu1-yYyMnO3 (y > 0.5) Crystals", M. Akaki, M. Hitomi, M. Ehara, D. Akahoshi, and H. Kuwahara: J. Phys. Soc. Jpn. 80, 094706 (2011).

46. "Electron- and Hole-Doping Effects on A-site Ordered NdBaMn2O6", Y. Miyauchi, M. Akaki, D. Akahoshi, and H. Kuwahara: J. Phys. Soc. Jpn. 80, 074708 (2011).

47. "The Effect of f-d Magnetic Coupling in Multiferroic RMnO3 Crystals", M. Hitomi, M. Ehara, M. Akaki, D. Akahoshi, and H. Kuwahara: J. Phys. Soc. Jpn. 79, 054704 (2010). 

48. "Magnetoelectric Properties of (Ca1−xSrx)2CoSi2O7 Crystals", M. Akaki, J. Tozawa, M. Hitomi, D. Akahoshi, and H. Kuwahara: J. Phys.: Conf. Ser. 200, 012003 (2010). 

49. "A-site substitution effect on physical properties of Sr3Fe2−xCoxO7−δ", J. Tozawa, M. Akaki, D. Akahoshi, H. Kuwahara, and K. Itatani: J. Phys.: Conf. Ser. 200, 012209 (2010).

50. "R-site Randomness Effect in Double-Perovskite RBaMn2O6", Y. Miyauchi, S. Fukushima, J. Tozawa, M. Akaki, H. Kuwahara, and D. Akahoshi: J. Phys.: Conf. Ser. 200, 012123 (2010). 

51. "Effects of magnetic field and pressure on the antiferromagnetic and weak-ferromagnetic orders in tetrahedral spin chain system Cu3Mo2O9", T. Hamasaki, H. Kuroe, T. Sekine, M. Akaki, H. Kuwahara, and M. Hase: J. Phys.: Conf. Ser. 200, 022013 (2010). 

52. "Gigantic magnetoelectric effect caused by magnetic-field-induced canted antiferromagnetic-paramagnetic transition in quasi-two-dimensional Ca2CoSi2O7 crystal", M. Akaki, J. Tozawa, D. Akahoshi, and H. Kuwahara: Appl. Phys. Lett. 94, 212904 (2009).

53. "Cr-doping effect on the orbital fluctuation of heavily doped Nd1-xSrxMnO3 (x ≈ 0.625)", R. Tasaki, S. Fukushima, M. Akaki, D. Akahoshi, and H. Kuwahara: J. Appl. Phys. 105, 07D725 (2009).

54. "Magnetic and dielectric properties of A2CoSi2O7 crystals (A=Ca, Sr, Ba)", M. Akaki, J. Tozawa, D. Akahoshi, and H. Kuwahara: J. Phys.: Conf. Ser. 150, 042001 (2009).

55. "Persistent and Reversible Phase Control in GdMnO3 near the Phase Boundary", H. Kuwahara, M. Akaki, J. Tozawa, M. Hitomi, K. Noda, and D. Akahoshi: J. Phys.: Conf. Ser. 150, 042106 (2009).

56. "Magnetodielectric effects in low-dimensional cobalt oxides", M. Akaki, F. Nakamura, D. Akahoshi, and H. Kuwahara: Physica B: Condens. Matter 403, 1505-1507 (2008). 

57. "Control of Ferroelectric Phases by 4f Magnetic Moments in Multiferroic RMnO3 Crystals", H. Kuwahara, K. Noda, M. Akaki, F. Nakamura, and D. Akahoshi: Mater. Res. Soc. Symp. Proc. 966, 0966-T06-02 (2007).

58. "Internal magnetic field effect on the magnetoelectricity in orthorhombic RMnO3 crystals", K. Noda, M. Akaki, F. Nakamura, D. Akahoshi, and H. Kuwahara: J. Magn. Magn. Mater. 310, 1162-1164 (2007). 

59. "Control of the ferroelectricity in a metastable state for orthorhombic RMnO3 crystals", K. Noda, M. Akaki, F. Nakamura, D. Akahoshi, and H. Kuwahara: J. Phys.: Condens. Matter 19, 145279 (2007).

60. "Magnetic-field-induced switching between ferroelectric phases in orthorhombic-distortion- controlled RMnO3", K. Noda, M. Akaki, T. Kikuchi, D. Akahoshi, and H. Kuwahara: J. Appl. Phys. 99, 08S905 (2006). 

[公開特許]

1. "磁性イオンを含むオケルマナイト構造を有する電気磁気材料を用いた電気磁気効果素子", 赤木暢, 桑原英樹: 特許番号5957195.

[受賞歴]

日本物理学会 第16回（2022年）若手奨励賞（領域3：磁性）「パルス強磁場を用いた電気磁気効果の研究」

2022年度SEST奨励賞「パルス強磁場・多周波電子スピン共鳴によるエレクトロマグノンの研究」