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Structures and magnetic properties in nano-crystalline Fe-rich Fe-Ni and Fe-Co alloys

Published online by Cambridge University Press:  24 January 2007

Yongsheng Liu ,
Jincang Zhang ,
Shixun Cao ,
Liming Yu  and
Chuanbing Cai
Yongsheng Liu*
Affiliation:
Department of Mathematics and Physics, Shanghai University of Electric Power, Shanghai 200090, P.R. China
Jincang Zhang
Affiliation:
Department of Physics, Shanghai University, Shanghai 200444, P.R. China
Shixun Cao
Affiliation:
Department of Physics, Shanghai University, Shanghai 200444, P.R. China
Liming Yu
Affiliation:
Department of Physics, Shanghai University, Shanghai 200444, P.R. China
Chuanbing Cai
Affiliation:
Department of Physics, Shanghai University, Shanghai 200444, P.R. China
*
[email protected]
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Abstract

Nano-crystalline magnetic alloys of Fe-Ni and Fe-Co are fabricated by high-energy milling. The coexistence of bcc and fcc lattice structures is observed in some of Fe-Ni alloys, as opposed to Fe-Co ones which exhibit the bcc phase only. The grain sizes increase linearly with the lattice strains for Fe-Co, and exponentially so for Fe-Ni. The cut-off frequency decreases with increasing nickel content in Fe-Ni alloys, but increases with increasing cobalt content in Fe-Co alloys. The larger the cut-off frequency is, the smaller the initial permeability. Resonant behaviour is observed in the pure Fe and Fe-Ni samples, which is replaced by relaxant behaviour in Fe-Co, implying that the Co plays an important role in hindering the resonance. The initial permeability at 10 kHz varies inverse proportionally with the coercivity H c . It reaches a maximum while H c goes to a minimum at 7.69 at.% Ni or Co. It is interesting that average atomic moments of nanocrystalline alloys are inconsistent with the Slater-Pauling relation.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 37 , Issue 2 , February 2007 , pp. 197 - 201
Copyright
© EDP Sciences, 2007

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References

Jen, S., Liou, S., J. Appl. Phys. 85, 8217 (1999) CrossRef
Lipinski, S., J. Magn. Magn. Mater. 140–144, 233 (1995) CrossRef
Sedov, V., Tsigel'nik, O., J. Magn. Magn. Mater. 183, 117 (1998) CrossRef
Shabanova, I., Tereboova, N., J. Struct. Chem. 41, 954 (2000) CrossRef
Yu, R., Basu, S., Zhang, Y., Parvizi-Majidi, A., Unruh, K., Xiao, J., IEEE T. Magn. 36, 3388 (2000) CrossRef
Jartych, E., Zurawicz, J., Budzynski, M., J. Phys.-Cond. Matter 5, 927 (1993) CrossRef
Coey, J., J. Alloy. Comp. 326, 2 (2001) CrossRef
Zhang, D., Prog. Mater. Sci. 49, 537 (2004) CrossRef
Oleszak, D., Shingu, P., J. Appl. Phys. 79, 2975 (1996) CrossRef
Nandi, P., Chattopadhyay, P., Pabi, S., Manna, I., Mater. Sci. Eng. A 359, 11 (2003) CrossRef
Kurht, C., Schultz, L., J. Appl. Phys. 71, 1896 (1992)
Calka, A., Wexler, D., Nature 419, 147 (2002) CrossRef
Linderoth, S., Pedersen, M., J. Appl. Phys. 75, 5869 (1994)
Li, T., Li, Y., Zhang, Y., J. Phys.-Cond. Matter 9, 1381 (1997)
Murama, M., Howe, J., Hidaka, H., Takaki, S., Science 295, 2433 (2002) CrossRef
Qin, W., Chen, Z., J. Alloy. Comp. 322, 286 (2001) CrossRef
Asaka, K., Hirotsu, Y., Tadaki, T., Mater. Sci. Eng. A 273–275, 262 (1999) CrossRef
N. Rochman, K. Kawamoto, H. Sueyoshi, Y. Nakamura, T. Nishida, J. Mater. Process. Tech. 89, 90, 367 (1999)
Ding, J., Shi, Y., Chen, L., Deng, C., Fuh, S., Li, Y., J. Magn. Magn. Mater. 247, 249 (2002) CrossRef
Nascimento, V., Passamani, E., Takeuchi, A., Larica, C., Nunes, E., J. Phys.-Cond. Matter 13, 665 (2001) CrossRef
Herzer, G., IEEE T. Magn. 26, 1397 (1990) CrossRef
Kim, Y., Chung, J., Kim, J., Jeon, H., Mater. Sci. Eng. A 291, 17 (2000) CrossRef
C. Kittel, Introduction to Solid State Physics (J. Wiley & Sons, Inc., New York, 1986)
The critical single domain size d sd is deduced from 72 (AK $_{1})^{1/2}/$ ( $\mu_{0}M_{S}^{2}$ ), where M S is spontaneous magnetization, K 1 magnetocrystalline anisotropy and A the exchange stiffness [see J. Coey, K. O'Donnell, J. Appl. Phys. 81, 4810 (1997)]. According to the formula, d sd is 12, 64, and 31 nm for Fe, Ni and Co at room temperature, respectively. On the other hand, according to calculation by Stoner [see D. Wan, X. Ma, Physics of Magnetism (The Electronic Science & Technology Press, Chengdu, PRC, 1994), p. 258 (in Chinese)], d sd is 24, 52 and 32 nm for Fe, Ni and Co, respectively. So, a single magnetic domain for the studied alloys (grain sizes are 6–25 nm) is assumed. CrossRef
Pekala, M., Oleszak, D., Jartych, E., Zurawicz, J., J. Non-Cryst. Solids 250–252, 757 (1999) CrossRef