The positron annihilation
lifetimes and the Doppler broadening by slow positron beam are measured in thin
Fe films with thickness 500 nm, a thin Hf film with thickness 100 nm, and the
bilayer Fe (50 nm)/Hf (50 nm) on quartz glass substrate. We have analyzed the behavior
in vacancy-type defects in each layer through some deposition temperatures and
annealing. It is observed that the thin Fe film, the thin Hf film, and the
bilayer Fe (50 nm)/Hf (50 nm) already contain many vacancy-type defects. We
have investigated the change of densities of the vacancy-carbon complex and the
small vacancy-cluster with carbons, through solid-state amorphization of Fe (50
nm)/Hf (50 nm) bilayer.
References
[1]
Schwarz, R.B. and Johnson, W.L. (1983) A Comparative Study of MR Imaging Profile of Titanium Pedicle Screws. Phys. Rev. Lett., 51, 415. http://dx.doi.org/10.1103/PhysRevLett.51.415
[2]
Koch, C.C., Calxin, O.B., McCamey, C.G. and Scarbrough, J.O. (1983) Preparation of “Amorphous” Ni60Nb40 by Mechanical Alloying. Appl. Phys. Lett., 43, 1017. http://dx.doi.org/10.1063/1.94213
[3]
Weeber, A.W. and Bakker, H. (1988) Amorphization by Ball Milling. A Review. Physica B, 153, 93.
http://dx.doi.org/10.1016/0921-4526(88)90038-5
[4]
Samwer, K. (1988) Amorphisation in Solid Metallic Systems. Phys. Rep., 161, 1.
http://dx.doi.org/10.1016/0370-1573(88)90006-3
[5]
Oguchi, T., Kanazawa, I., Iwashita, T., Soe, W., Yamaguchi, A. and Yamamoto, R. (1992) Solid State Amorphization in Cu-Hf Multilayers Studied by Time-Differential Per-turbed-Angular Correlation. J. Non-Cryst. Solids., 150, 448.
http://dx.doi.org/10.1016/0022-3093(92)90170-O
[6]
Yamamoto, Y., Matsubara, H., Yamaguchi, M., Oguchi, T., Kanazawa, I., Iwashita, T., Ito, Y., Takamura, S., Soe, W., Yamaguchi, A. and Yamamoto, R. (1993) Cu-Hf Multilayers Studied by Slow Positron Beam and Time Differential Perturbed Angular Correlation. J. Magn. Magn. Mater., 126, 170. http://dx.doi.org/10.1016/0304-8853(93)90573-K
[7]
Matsubara, H., Yamamoto, Y., Kanazawa, I., Iwashita, T., Ito, Y., Takamura, S., Soe, W. and Yamamoto, R. (1994) Studies of Multilayers of Cu-Hf with a Variable-Energy Positron Beam. Hyperfine Interaction, 84, 159.
http://dx.doi.org/10.1007/BF02060657
[8]
Oshima, N., Nakajyo, T., Kanazawa, I., Iwashita, T., Ito, Y., Soe, W. and Yamamoto, R. (1995) Multilayered Ni/Hf and Solid-State Amorphization Studied Using the Slow Positron Beam Technique. Appl. Surf. Sci., 85, 329.
http://dx.doi.org/10.1016/0169-4332(94)00354-8
[9]
Watanabe, Y., Oura, H. and Onozato, N. (1990) Magnetic Properties of Fe-Ta-N-O Film with High Saturation Flux Density. IEEE Trans. Magn., 26, 1500. http://dx.doi.org/10.1109/20.104429
[10]
Hasegawa, N. and Saito, M. (1990) Soft Magnetic Properties of Microcrys-talline Fe-M-C (M=V, Nb, Ta) Films with High Thermal Stability. J. Magn. Soc. Jpn., 14, 313. http://dx.doi.org/10.3379/jmsjmag.14.313
[11]
Taneko, N., Shimada, Y., Fukamichi, K. and Miyakawa, C. (1991) Fa-brication of Fe-Zr-N Films with Very Low Coercivity. Jpn. J. Appl. Phys., 30, L195. http://dx.doi.org/10.1143/JJAP.30.L195
[12]
Hasegawa, N., Kataoka, N., Fujimori, H. and Saito, M. (1991) Structural and Soft Magnetic Properties of Fe/Fe-Hf-C Multilayered Films with the High B s and Thermal Stability. J. Appl. Phys., 70, 6253.
http://dx.doi.org/10.1063/1.349983
[13]
Hoffmann, H. (1964) Quantitative Calculation of the Magnetic Ripple of Un-iaxial Thin Permalloy Films. J. Appl. Phys., 35, 1790. http://dx.doi.org/10.1063/1.1713743
[14]
Herzer, G. (1990) Grain Size Dependence of Coercivity and Permeability in Nanocrystalline Ferromagnets. IEEE Trans. Magn., 26, 1397. http://dx.doi.org/10.1109/20.104389
[15]
Schultz, P.J. and Lynn, K.G. (1988) Interaction of Positron Beams with Surfaces, Thin Films, and Interfaces. Rev. Mod. Phys, 60, 701. http://dx.doi.org/10.1103/RevModPhys.60.701
[16]
Murashige, Y., Tashiro, M., Nakajyo, T., Koizumi, T., Kanazawa, I., Komori, F. and Ito, Y. (1997) The Multilayer Fe/Hf Studied with Slow Positron Beam. Appl. Surf. Sci., 113-114, 169.
http://dx.doi.org/10.1016/S0169-4332(96)00844-6
[17]
Tashiro, M., Nakajyo, T., Murashige, Y., Koizumi, T., Kana-zawa, I., Komori, F., Soe, W., Yamamoto, R. and Ito, Y. (1997) The Study of Multilayers Fe/Hf and Ni/Hf by Slow Positron Beam Technique. Appl. Surf. Sci., 116, 263.
http://dx.doi.org/10.1016/S0169-4332(96)01066-5
[18]
Ohtaki, H., Koizumi, T., Iwamoto, A., Kanazawa, I., Komori, F. and Ito, Y. (1998) The Study of Amorphization in Multilayer Fe/Hf with Slow Positron Beam. Appl. Surf. Sci., 130-132, 828.
http://dx.doi.org/10.1016/S0169-4332(98)00161-5
[19]
Nagata, T., Ozaki, A., Terashima, Y., Kanazawa, I., Suzuki, R., Ohdaira, T., Komori, F. and Ito, Y. (2000) Solid-State Amorphization in Multilayer Fe/Hf Studied by Slow Positrons. Nucl. Instrument Method. Phys. Research B, 170, 240.
http://dx.doi.org/10.1016/S0168-583X(00)00162-2
[20]
Takagi, K., Furukawa, N., Kanazawa, I., Suzuki, R. and Oh-daira, T. (2002) Formation of Hydrogen-Induced Vacancies during Growth of the Fe Layer Studied by Slow Positron Beam. Surf. Sci., 514, 298.
http://dx.doi.org/10.1016/S0039-6028(02)01644-8
[21]
Suzuki, H., Azami, K., Komagata, S., Kanazawa, I., Suzuki, R. and Ohdaira, T. (2010) Diffusion of Positrons in Polymers Studied by Slow Positron Beam. J. Phys. CS, 225, 012053.
[22]
Suzuki, R., Kobayashi, Y., Mikado, T., Ohgaki, H., Chiwaki, M., Yamazaki, T. and Tomimasu, T. (1991) Slow Positron Pulsing System for Variable Energy Positron Lifetime Spectroscopy. Jpn. J. Appl. Phys., 30, L532.
http://dx.doi.org/10.1143/JJAP.30.L532
[23]
Kirkegaard, P., Eldrup, M., Mogensen, O.E. and Pedersen, N.J. (1981) Program System for Analysing Positron Lifetime Spectra and Angular Correlation Curves. Comput. Phys. Commun., 23, 307.
http://dx.doi.org/10.1016/0010-4655(81)90006-0
[24]
Ghosh, V.J. (1995) Positron Implantation Profiles in Elemental and Multilayer Systems. Appl. Surf. Sci., 85, 187.
http://dx.doi.org/10.1016/0169-4332(94)00331-9
[25]
Aers, G.C., Marshall, P.A., Leung, T.C. and Goldberg, R.D. (1995) Defect Profiling in Multilayered Systems Using Mean Depth Scaling. Appl. Surf. Sci., 85, 196. http://dx.doi.org/10.1016/0169-4332(94)00332-7
[26]
Puska, M.J. and Nieminen, R.M. (1994) Theory of Positrons in Solids and on Solid Surfaces. Rev. Mod. Phys., 66, 841.
http://dx.doi.org/10.1103/RevModPhys.66.841
[27]
Nieminen, M.R. and Puska, M.J. (1982) Defect Spectroscopy with Positrons: Calculations. Coleman, P.G., Sharma, S.C. and Dian, L.M., Eds., Proc. 6th Int. Conf. Positron Annihilation, North-Holland Pub, 395.
[28]
Kamimura, Y., Tsutsumi, T. and Kuramoto, E. (1995) Calculations of Positron Lifetimes in a Jog and Vacancies on an Edge-Dislocation Line in Fe. Phys. Rev. B, 52, 879. http://dx.doi.org/10.1103/PhysRevB.52.879
[29]
Hautoj?rvi, P., Johansson, J., Vehanen, A., Yli-Kauppila, J. and Moser, P. (1980) Vacancy-Carbon Interaction in Iron. Phys. Rev. Lett., 44, 1326. http://dx.doi.org/10.1103/PhysRevLett.44.1326
[30]
Vehanen, A., Hautoj?rvi, P., Johansson, J., Yli-Kauppila, J. and Moser, P. (1982) Vacancies and Carbon Impurities in α-Iron: Electron Irradiation. Phys. Rev. B, 25, 762. http://dx.doi.org/10.1103/PhysRevB.25.762
[31]
Tanigawa, S., Hinode, K., Owada, N., Doyama, M. and Okuda, S. (1979) The Studies of Recovery of Irradiated Iron by Positron Annihilation. Hasiguchi, R.R. and Fujiwara, K., Proc. 5th Int. Conf. Positron Annihilation, Japan Institute of Metals, Sendai, 501.
[32]
Hautoj?rvi, P., Judin, T., Vehanen, A., Yli-Kauppila, J., Johansson, J., Verdone, J. and Moser, P. (1979) Annealing of Vacancies in Electron-Irradiated α-Iron. Solid State Commun., 29, 855.
http://dx.doi.org/10.1016/0038-1098(79)90507-6
[33]
Hettich, G., Mehrer, H. and Maier, K. (1977) Self-Diffusion in Ferromagnetic α-Iron. Scripta Met., 11, 795.
http://dx.doi.org/10.1016/0036-9748(77)90078-3
