Quasi-analytical calculation of thermal magnetization fluctuation noise in giant magnetoresistive sensors

IEEE Transactions on Magnetics

Volumn 40, Issue 3, 2004, Pages 1712-1722

  Jin, Zhen ^a,b   Bertram, H Neal ^a   Safonov, Vladimir ^a  

^a UNIVERSITY OF CALIFORNIA   (United States)

^b SEAGATE TECHNOLOGY   (United States)

Author keywords

Diagonalization; Dynamic damping parameter; Eigenmode; GMR sensors; Noise spectra; Thermal fluctuation

Indexed keywords

COMPUTATIONAL METHODS; DAMPING; EIGENVALUES AND EIGENFUNCTIONS; FOURIER TRANSFORMS; GIANT MAGNETORESISTANCE; MAGNETIC FIELDS; MAGNETIZATION; SIGNAL TO NOISE RATIO; TENSORS; THERMAL NOISE;

AMBIENT THERMAL ENERGY; DIAGONALIZATION; DYNAMIC DAMPING PARAMETER;

SENSORS;

EID: 2642566205     PISSN: 00189464     EISSN: None     Source Type: Journal    
DOI: 10.1109/TMAG.2004.826619     Document Type: Article

References (27)

1. N. Smith and P. Arnett, "White-noise magnetization fluctuations in magnetoresistive heads," Appl. Phys. Lett., vol. 78, no. 10, pp. 1448-1450, 2001.
2. J. Zhu, "Thermal magnetic noise and spectra in spin valve heads," J. Appl. Phys., vol. 91, pp. 7273-7275, May 2002.
3. N. Smith, "Fluctuation-dissipation considerations for phenomenological damping models for ferromagnetic thin films," J. Appl. Phys., vol. 92, p. 3877, 2002.
4. K. Yu. Guslienko et al., "Effective dipolar boundary conditions for dynamic magnetization in thin magnetic stripes," Phys. Rev., vol. B66, p. 132402, 2002.
5. H. N. Bertram and X. Wang, "Local relaxation mechanisms and collective stochastics dynamics," J. Magn. Magn. Mater., to be published.
6. H. N. Bertram, V. L. Safonov, and Z. Jin, "Thermal magnetization noise, damping fundamentals and mode analysis: application to a thin film GMR sensor," IEEE Trans Magn., vol. 38, pp. 2514-2519, Sept. 2002.
7. V. L. Safonov and H. N. Bertram, "Linear stochastic magnetization dynamics and microscopic relaxation mechanisms," J. Appl. Phys., vol. 94, pp. 529-538, July 2003.
8. S. X. Wang and A. M. Taratorin, Magnetic Information Storage Technology. New York: Academic, 1999, ch. 6.
9. E. M.Edgar M. Williams, Design and Analysis of Magnetoresistive Head. New York: Wiley, 2001, ch. 6.
10. D. E. Heim, "On the track profile in magnetoresistive heads," IEEE Trans. Magn., vol. 30, pp. 1453-1464, July 1994.
11. N. Smith, "Micromagnetics of GMR multilayer sensors at high current densities," IEEE Trans. Magn., vol. 30, pp. 3822-3824, Nov. 1994.
12. J. Zhu, "Spin valve and dual spin valve heads with synthetic antiferromagnets," IEEE Trans. Magn., pt. 1, vol. 35, pp. 655-660, Mar. 1999.
13. H. Zhou, "Micromagnetic analyses of effects of intergranular magnetostatic and exchange interactions on signal-to-noise ratio and thermal stability in hard disk drive recording media," Ph. D. dissertation, Univ. California, San Diego, 2001.
14. NIST, http://www.ctcms.nist.gov/~rdm/mumag.html.
15. E. Champion and H. N. Bertram, "Hysteresis and baseline shift in permanent magnet stabilized MR/SAL heads," IEEE Trans. Magn., vol. 32, pp. 13-18, Jan. 1996.
16. E. Champion, "Digital magnetic recording systems using MR playback technology: Theoretical studies," Ph. D. dissertation, Univ. California, San Diego, 1997.
17. W. Rave and A. Hubert, "Magnetic ground state of a thin-film element," IEEE Trans. Magn., vol. 36, pp. 3886-3899, Nov. 2000.
18. H. N. Bertram, Z. Jin, and V. Safonov, "Experimental and theoretical studies of thermal magnetization noise in GMR heads," IEEE Trans. Magn., pt. 1, vol. 38, pp. 38-44, Jan. 2002.
19. S.W. Yuan, "Micromagnetics of domains and walls in soft ferromagnetic materials," Ph. D. dissertation, Univ. California, San Diego, 1992.
20. W. F. Brown, Jr., Micromagnetics: Wiley Interscience, 1963.
21. D. M. Young and R. T. Gregory, A Survey of Numerical Mathematics. New York: Dover, 1988, vol. II.
22. S. W. Yuan, T. Kobayashi, and S. H. Liao, "Correlation of MR head responses to uniform field and recording media excitations," IEEE Trans. Magn., vol. 31, no. 6, pp. 2627-2629, Nov. 1995.
23. V. L. Safonov and H. N. Bertram, "Impurity relaxation mechanism for dynamic magnetization reversal in a single domain grain," Phys. Rev. B, vol. 61, no. 22, pp. R14893-R14896, 2000.
24. Z. Jin, H. N. Bertram, and H. Dakroub, "Experimental measurements and analysis of thermal magnetization noise in GMR sensors," IEEE Trans. Magn., vol. 38, pp. 2265-2267, 2002.
25. Y. Zhou, A. Roesler, and J.-G. Zhu, "Experimental observations of thermally excited ferromagnetic resonance and mag-noise spectra in spin valve heads," J. Appl. Phys., vol. 91, no. 10, pp. 7276-7278, May 2002.
26. J. C. Jury, K. B. Klaassen, J. C. L. van Peppen, and S. X. Wang, "Measurement and analysis of noise sources in GMR sensors up to 6 GHz," preprint, 2002.
27. H. Dakroub and Z. Jin, unpublished results, 2002.