Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
권호 표지
DOI QR코드

DOI QR Code

Initial Magnetization and Coercivity Mechanism in Amorphous TbxCo1-x Thin Films with Perpendicular Anisotropy

  • Kim, Tae-Wan (Department of Advanced Materials Engineering, Sejong University) ;
  • Lee, Ha-Na (Department of Advanced Materials Engineering, Sejong University) ;
  • Lee, Hyun-Yong (Faculty of Applied Chemical Engineering, Chonnam National University) ;
  • Lee, Kyoung-Il (Nano Convergence Device Center, Korea Institute of Science and Technology)
  • Received : 2010.09.01
  • Accepted : 2010.11.24
  • Published : 2010.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

The coercivity mechanism in permanent magnets was analyzed according to the effects of domain nucleation and domain wall pinning. The coercivity mechanism of a TbCo thin film with high perpendicular magnetic anisotropy was considered in terms of the local inhomogeneity in the thin film. The initial magnetization curves of the TbCo thin films demonstrated domain wall pinning to be the main contributor to the coercivity mechanism than domain nucleation. Based on the coercivity model proposed by Kronmuller et al., the inhomogeneity size acting as a domain wall pinning site was determined. Using the measured values of perpendicular anisotropy constant ($K_u$), saturation magnetization ($M_s$), and coercivity ($H_c$), the inhomogeneity size estimated in a TbCo thin film with high coercivity was approximately 9 nm.

Keywords

References

  1. M. S. Hwang and T. D. Lee, J. Magnetics 6, 19 (2001).
  2. S. Saito, F. Hoshi, D. Haserawa, and M. Takashi, J. Magnetics 7, 115 (2002). https://doi.org/10.4283/JMAG.2002.7.3.115
  3. K. Kronmuller, K.-D. Durst, and M. Sagawa, J. Magn. Magn. Mater. 74, 291 (1988). https://doi.org/10.1016/0304-8853(88)90202-8
  4. S. Hirosawa, K. Tikuhara, Y. Matsuara, H. Yamamoto, S. Fujimura, and M. Sagawa, J. Magn. Magn. Mater. 61, 363 (1986). https://doi.org/10.1016/0304-8853(86)90050-8
  5. T. Suzuki, H. Notarys, D. C. Dobbertin, C. J. Lin, D. Weller, D. C. Miller, and G. Gorman, IEEE Trans. Magn. 28, 2754 (1992). https://doi.org/10.1109/20.179618
  6. I. A. Campbell, J. Phys. F2, L47 (1972).
  7. J. H. Crasemann, P. Hansen, M. Rosenkranz, and K. Witter, J. Appl. Phys. 66, 1273 (1989). https://doi.org/10.1063/1.344425
  8. R. C. Taylor and A. Gangulee, J. Appl. Phys. 48, 358 (1977). https://doi.org/10.1063/1.323387

Cited by

  1. Imprinted Magnetic Anisotropy and Zigzag Domain Structure of Amorphous TbCo Films vol.28, pp.12, 2015, https://doi.org/10.1007/s10948-015-3172-9