Graded anisotropy FePtCu films

IEEE Transactions on Magnetics

Volumn 47, Issue 6 PART 1, 2011, Pages 1580-1586

  Dumas, Randy K ^a   Zha, Chaolin ^b   Fang, Yeyu ^b   Bonanni, Valentina ^b   Lau, June W ^c   Nogués, Josep ^b,d   Åkerman, Johan ^a,b  

^a UNIVERSITY OF GOTHENBURG   (Sweden)

^b ROYAL INSTITUTE OF TECHNOLOGY   (Sweden)

^c NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY   (United States)

^d UNIVERSITAT AUTÒNOMA DE BARCELONA   (Spain)

Author keywords

FePtCu thin films; first order reversal curve (FORC) measurements; graded anisotropy films; magnetic reversal mechanism

Indexed keywords

ANNEALING; IRON ALLOYS; MAGNETIC ANISOTROPY; MAGNETIC HYSTERESIS; MAGNETOMETERS; OPTICAL KERR EFFECT; PLATINUM ALLOYS; TERNARY ALLOYS; THIN FILMS;

ALTERNATING GRADIENT MAGNETOMETER; ANISOTROPY FILM; ANNEALING TEMPERATURES; COMPOSITION DEPENDENCE; COMPOSITIONAL GRADIENTS; FIRST-ORDER REVERSAL CURVES; MAGNETIC REVERSAL; MAGNETO-OPTICAL KERR EFFECTS;

COPPER ALLOYS;

EID: 79957788901     PISSN: 00189464     EISSN: None     Source Type: Journal    
DOI: 10.1109/TMAG.2010.2102745     Document Type: Article

References (31)

1. D. Suess, "Multilayer exchange spring media for magnetic recording," Appl. Phys. Lett., vol. 89, pp. 113105-1-113105-3, Sept. 2006.
2. D. Suess, J. Fidler, G. Zimanyi, T. Schrefl, and P. Visscher, "Thermal stability of graded exchange spring media under the influence of external fields," Appl. Phys. Lett., vol. 92, pp. 173111-1-173111-3, May 2008.
3. 2 and data rates beyond 1 Gb/s," IEEE Trans. Magn., vol. 38, pp. 3675-3683, Nov. 2002.
4. J. P. Wang, "Tilting for the top," Nat. Mater., vol. 4, pp. 191-192, Mar. 2005.
5. R. H. Victora and X. Shen, "Composite media for perpendicular magnetic recording," IEEE Trans. Magn., vol. 41, pp. 537-542, Feb. 2005. (Pubitemid 40296485)
6. T. W. McDaniel, "Ultimate limits to thermally assisted magnetic recording," J. Phys. Condens. Matter, vol. 17, no. 7, pp. R315-R332, Feb. 2005. (Pubitemid 40305200)
7. J. G. Zhu, X. C. Zhu, and Y. H. Tang, "Microwave assisted magnetic recording," IEEE. Trans. Magn., vol. 44, pp. 125-131, Jan. 2008.
8. M. H. Kryder and R. W. Gustafson, "High-density perpendicular recording\advances, issues, and extensibility," J. Magn. Magn. Mater., vol. 287, pp. 449-458, Feb. 2005. (Pubitemid 40135709)
9. 2 and beyond," IEEE Trans. Magn., vol. 35, pp. 2790-2795, Sep. 1999. (Pubitemid 32261761)
10. V. Alexandrakis, D. Niarchos, K. Mergia, J. Lee, J. Fidler, and I. Pana-giotopoulos, "Magnetic properties of graded A1/L1 films obtained by heat treatment of FePt/CoPt multilayers," J. Appl. Phys., vol. 107, pp. 013903-1-013903-4, Jan. 2010.
11. J. S. Chen, L. S. Huang, J. F. Hu, G. Ju, and G. M. Chow, "FePt-C graded media for ultra-high density magnetic recording," J. Phys. D: Appl. Phys., vol. 43, pp. 185001-1-185001-5, Apr. 2010.
12. 0-FePt/Fe composite media with perpendicular magnetization," J. Appl. Phys., vol. 104, pp. 083903-1-083903-4, Oct. 2008.
13. B. J. Kirby, J. E. Davies, K. Liu, S. M. Watson, G. T. Zimanyi, R. D. Shull, P. A. Kienzle, and J. A. Borchers, "Vertically graded anisotropy in Co/Pd multilayers," Phys. Rev. B, vol. 81, pp. 100405-1-100405-4, Mar. 2010.
14. B. J. Kirby, S. M. Watson, J. E. Davies, G. T. Zimanyi, K. Liu, R. D. Shull, and J. A. Borchers, "Direct observation of magnetic gradient in Co/Pd pressure-graded media," J. Appl. Phys., vol. 105, pp. 07C929-1-07C929-3, Apr. 2009.
15. T. J. Zhou, B. C. Lim, and B. Liu, "Anisotropy graded FePt-TiO nanocomposite thin films with small grain size," Appl. Phys. Lett., vol. 94, pp. 152505-1-152505-3, Apr. 2009.
16. V. Bonanni, Y. Fang, R. K. Dumas, C. Zha, S. Bonetti, J. Nogués, and J. Åkerman, "First-order reversal curve analysis of graded anisotropy FePtCu films," Appl. Phys. Lett., vol. 97, pp. 202501-1-202501-3, Nov. 2010.
17. C. Zha, R. K. Dumas, Y. Fang, V. Bonanni, J. Nogués, and J. Åkerman, "Continuously graded anisotropy in single (Fe Pt) Cu films," Appl. Phys. Lett., vol. 97, pp. 182504-1-182504-3, Nov. 2010.
18. Y. Fang, R. K. Dumas, C. I. Zha, and J. Åkerman, "An in-situ anneal study of graded anisotropy FePtCu film," IEEE Magn. Lett., vol. 2, pp. 5500104-1-5500104-4, Mar. 2011.
19. C. L. Zha, Y. Y. Fang, J. Nogués, and J. Åkerman, "Improved magnetoresistance through spacer thickness optimization in tilted pseudo spin valves based on (111)-oriented FePtCu fixed layers," J. Appl. Phys., vol. 106, pp. 053909-1-053909-4, Sept. 2009.
20. C. L. Zha, J. Persson, S. Bonetti, Y. Y. Fang, and J. Åkerman, "Pseudo spin valves based on (111)-oriented FePt fixed layers with tilted anisotropy," Appl. Phys. Lett., vol. 94, pp. 163108-1-163108-3, Apr. 2009.
21. C. L. Zha and J. Åkerman, "Study of pseudo spin valves based on (111)-oriented FePt and FePtCu fixed layer with tilted magnetocrystalline anisotropy," IEEE Trans. Magn., vol. 45, pp. 3491-3494, Oct. 2009.
22. C. L. Zha, J. Nogués, and J. Åkerman, "Exchange bias in (111)-oriented FePt-based pseudo spin valves," IEEE Trans. Magn., vol. 45, pp. 3881-3884, Oct. 2009.
23. Y. Zhou, S. Bonetti, C. L. Zha, and J. Åkerman, "Zero-field precession and hysteretic threshold currents in a spin torque nano device with tilted polarizer," New J. Phys., vol. 11, pp. 103028-1-103028-12, Oct. 2009.
24. Y. Zhou, C. L. Zha, S. Bonetti, J. Persson, and J. Åkerman, "Spintorque oscillator with tilted fixed layer magnetization," Appl. Phys. Lett., vol. 92, pp. 262508-1-262508-3, Jun. 2008.
25. T. Maeda, T. Kai, A. Kikitsu, T. Nagase, and J.-I. Akiyama, "Reduction of ordering temperature of an FePt-ordered alloy by addition of Cu," Appl. Phys. Lett., vol. 80, pp. 2147-2149, Jan. 2002.
26. C. L. Platt, K. W. Wierman, E. B. Svedberg, R. van de Veerdonk, J. K. Howard, A. G. Roy, and D. E. Laughlin, "Ordering and microstructure of FePt thin films with Cu, Ag, and Au additive," J. Appl. Phys., vol. 92, pp. 6104-6109, Nov. 2002. (Pubitemid 35445616)
27. J. E. Davies, O. Hellwig, E. E. Fullerton, G. Denbeaux, J. B. Kortright, and K. Liu, "Magnetization reversal of Co/Pt multilayers: Microscopic origin of high-field magnetic irreversibility," Phys. Rev. B, vol. 70, pp. 224434-1-224434-8, Dec. 2004.
28. J. E. Davies, O. Hellwig, E. E. Fullerton, J. S. Jiang, S. D. Bader, G. T. Zimanyi, and K. Liu, "Anisotropy dependence of irreversible switching in Fe/SmCo and FeNi/FePt exchange spring magnet films," Appl. Phys. Lett., vol. 86, pp. 262503-1-262503-3, Jun. 2005.
29. R. K. Dumas, C.-P. Li, I. V. Roshchin, I. K. Schuller, and K. Liu, "Magnetic fingerprints of sub-100 nm Fe dots," Phys. Rev. B, vol. 75, pp. 134405-1-134405-5, Apr. 2007.
30. C. R. Pike, A. P. Roberts, and K. L. Verosub, "Characterizing interactions in fine magnetic particle systems using first order reversal curves," J. Appl. Phys., vol. 85, pp. 6660-6667, May 1999. (Pubitemid 129648194)
31. A. S. Sabau, P. B. Kadolkar, R. B. Dinwiddie, R. D. Ott, and C. A. Blue, "Process parameters for infared processing of FePt nanoparticle films," Metall. Mater. Trans., vol. 38, pp. 788-797, Apr. 2007 (Pubitemid 47023305)