Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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The Properties of Spin Valves with a Partially Oxidized Fe or CoFe Ultra-Thin Layer Inserted in the Magnetic Layers

  • In, Jang-sik (Materials Science and Engineering, Yonsei University) ;
  • Han,Yoon-sung (Materials Science and Engineering, Yonsei University) ;
  • Kim, Sung-hoon (Materials Science and Engineering, Yonsei University) ;
  • Shim, Jae-chul (Materials Science and Engineering, Yonsei University) ;
  • Hong, Jong-ill (Materials Science and Engineering, Yonsei University)
  • Published : 2006.09.01

Abstract

Co-ferrite nanoparticles have been synthesized by the decomposition of iron(III) acetylacetonate, $Fe(acac)_3$ and Co acetylacetonate, $Co(acac)_2$ in benzyl/phenyl ether in the presence of oleic acid and oleyl amine at the refluxingtemperature of $295^{\circ}C$/$265^{\circ}C$ for 30 min. before cooling to room temperature. Particle diameter detected by PSA can be turned from 4 nm to 20 nm by seed-mediated growth and reaction conditions. Structural and magneticcharacterization of Co-ferrite were measured by use of HRTEM, SAED (selected area electron diffraction), XRD and SQUID. The as-synthesized Co-ferrite nanoparticles have a cubic spinel structure and coercivity of 20 nm $CoFe_{2}O_{4} nanoparticles reached 1 kOe at room temperature and 18 kOe at 10 K.

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References

  1. D. E. Heim, R. E. Fontana, Jr., C. Tsang, V. S. Speriosu, B. A. Gurney, and M. L. Williams, IEEE Trans. Magn. 30, 316 (1994) https://doi.org/10.1109/20.312279
  2. P. Zhan, J. Binder, I. Mertig, R. Zeller, and P. H. Dederichs, Phys. Rev. Lett. 80, 4309 (1998) https://doi.org/10.1103/PhysRevLett.80.4309
  3. C. H. Marrows and B. J. Hickey, Phys. Rev. B 63, 220405(R)1 (2001) https://doi.org/10.1103/PhysRevB.63.220405
  4. J. Hong and Hitoshi Kanai, Jpn. J. Appl. Phys. 42, 7296 (2003) https://doi.org/10.1143/JJAP.42.7296
  5. W. F. Egelhoff, Jr., P. J. Chen, C. J. Powell, M. D. Stiles, R. D. McMichael, J. H. Judy, K. Takano, and A. E. Berkowitz, J. Appl. Phys. 82, 6142 (1997) https://doi.org/10.1063/1.365620
  6. J. Hong, K. Noma, E. Kanda, and H. Kanai, Appl. Phys. Lett. 83, 960 (2003) https://doi.org/10.1063/1.1597751
  7. J. Hong, Y. Lee, M. K. Lee, H. J. Song, H. Shin, Y. Yoo, and J. Suh, Appl. Phys. Lett. 83, 4803 (2003) https://doi.org/10.1063/1.1632024
  8. J. In, Y. Han, S. Kim, J. Shim, and J. Hong, submitted for publication (2006)
  9. J. R. Childress, M. J. Carey, R. J. Wilson, N. smith, C. Tsang, M. K. Ho, K. Carey, S. A. MacDonald, L. M. Ingall, and B. A. Gurney, IEEE Trans. Magn. 37, 1745 (2001) https://doi.org/10.1109/20.950956
  10. T. Burkert, L. Nordstrom, O. Eriksson, and O. Heinonen, Phys. Rev. Lett. 93, 0272031 (2004) https://doi.org/10.1103/PhysRevLett.93.027203