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High Magnetic Field Annealing of Mn-Ga Intermetallic Alloys

MRS Advances volume 1, pages 227–233 (2016)Cite this article

Abstract

Mn-Ga alloys have shown promising hard magnetic properties, even though these alloys contain no rare-earth metals. However, much work is needed before Mn-Ga alloys become viable permanent magnets for applications. One of the challenges is to enhance the remanence. One technique to improve this property is applying a magnetic field during the heat treatment process. Magnetic annealing can promote phase transformation of the phases with high magnetic moment. This results in an increased remanence. Bulk samples of Mn-Ga alloys were made by mechanically alloying in order to create a nanostructured composite, followed by heat treatments in the presence of a 31 T magnetic field. The heat treatment temperatures were kept low in order to keep the refined microstructure. All the alloys exhibit hard magnetic properties at room temperature with large coercivity. This work reports findings of magnetic field annealed Mn-Ga bulk that exhibit high coercivities up to 19.4 kOe and increased remanence of 50% over the binary system, achieving values up to 6.9 emu/g. This is the highest coercivity reported in bulk Mn-Ga samples.

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References

  1. K. H. J. Buschow, “New developments in hard magnetic materials,” Rep. Prog. Phys., vol. 54, no. 9, p. 1123, Sep. 1991.

    Article  CAS  Google Scholar 

  2. J. F. Herbst, “R2Fe14B materials: Intrinsic properties and technological aspects,” Rev. Mod Phys., vol. 63, pp. 819–898, Oct. 1991.

    Article  CAS  Google Scholar 

  3. L. H. Lewis and F. Jiménez-Villacorta, “Perspectives on Permanent Magnetic Materials for Energy Conversion and Power Generation,” Metall. Mater. Trans. A, vol. 44, no. 1, pp. 2–20, Jul. 2012.

    Google Scholar 

  4. J. N. Feng, X. G. Zhao, X. K. Ning, C. W. Shih, W. C. Chang, S. Ma, W. Liu, and Z. D. Zhang, “Phase evaluation, magnetic, and electric properties of Mn60+xGa40-x (x = 0-15) ribbons,” J. Appl. Phys., vol. 115, no. 17, p. 17A750, May 2014.

    Article  Google Scholar 

  5. D. R. Brown, K. Han, and T. Siegrist, “Hard magnetic properties observed in bulk Mn1-xGax,” J. Appl. Phys., vol. 115, no. 17, p. 17A723, May 2014.

    Article  Google Scholar 

  6. J. M. D. Coey, “New permanent magnets; manganese compounds,” J. Phys. Condens. Matter, vol. 26, no. 6, p. 064211, Feb. 2014.

    Article  CAS  Google Scholar 

  7. J. Z. Wei, “Structural properties and large coercivity of bulk Mn3-xGa (0 < x < 1.15),” J. Appl. Phys., vol. 115, no. 17, 2014.

    Google Scholar 

  8. A. A. El-Gendy and G. Hadjipanayis, “Nanostructured D022-Mn3Ga with high coercivity,” J. Appl. Phys., vol. 48, no. 12, p. 125001, Apr. 2015.

    Google Scholar 

  9. S. Ener, K. P. Skokov, D. Y. Karpenkov, M. D. Kuz’min, and O. Gutfleisch, “Magnet properties of Mn70Ga30 prepared by cold rolling and magnetic field annealing,” J. Magn. Magn. Mater, vol. 382, pp. 265–270, May 2015.

    Article  CAS  Google Scholar 

  10. Q. L. Ma, X. M. Zhang, T. Miyazaki, and S. Mizukami, “Artificially engineered Heusler ferrimagnetic superlattice exhibiting perpendicular magnetic anisotropy,” Sci. Rep., vol. 5, Jan. 2015.

  11. T. Saito and D. Nishio-Hamane, “New hard magnetic phase in Mn-Ga-Al system alloys,” J. Alloys Compd, vol. 632, pp. 486–489, May 2015.

    Article  CAS  Google Scholar 

  12. B. Balke, G. H. Fecher, J. Winterlik, and C. Felser, “Mn3Ga, a compensated ferrimagnet with high Curie temperature and low magnetic moment for spin torque transfer applications,” Appl. Phys. Lett, vol. 90, no. 15, pp. 152504–152504-3, Apr. 2007.

    Article  Google Scholar 

  13. J. Winterlik, B. Balke, G. H. Fecher, C. Felser, M. C. M. Alves, F. Bernardi, and J. Morais, “Structural, electronic, and magnetic properties of tetragonal Mn3-xGa : Experiments and first-principles calculations,” Phys. Rev. B, vol. 77, p. 054406, Feb. 2008.

    Article  Google Scholar 

  14. T. Saito and R. Nishimura, “Hard magnetic properties of Mn-Ga melt-spun ribbons,” J. Appl. Phys., vol. 112, no. 8, p. 083901, Oct. 2012.

    Article  Google Scholar 

  15. Y. Huh, P. Kharel, V. R. Shah, X. Z. Li, R. Skomski, and D. J. Sellmyer, “Magnetism and electron transport of MnyGa (1 < y < 2) nanostructures,” J. Appl. Phys., vol. 114, no. 1, p. 013906, Jul. 2013.

    Article  Google Scholar 

  16. Q. Ma, A. Sugihara, K. Suzuki, X. Zhang, T. Miyazaki, and S. Mizukami, “TETRAGONAL HEUSLER-LIKE Mn-Ga ALLOYS BASED PERPENDICULAR MAGNETIC TUNNEL JUNCTIONS,” SPIN, vol. 04, no. 04, p. 1440024, Sep. 2014.

    Article  CAS  Google Scholar 

  17. B.D. Cullity, Introduction to Magnetic Materials, 2nd ed. Piscataway: Wiley, 2012.

    Google Scholar 

  18. B.z. Cui, K. Han, H. Garmestani, H.j. Schneider-Muntau, J.h. Su, and J.p. Liu, “Enhancement of material properties by magnetic field assisted phase transformation,” in Materials Processing in Magnetic Fields, 0 vols., WORLD SCIENTIFIC, 2005, pp. 19–28.

  19. B. Z. Cui, K. Han, H. Garmestani, J. H. Su, H. J. Schneider-Muntau, and J. P. Liu, “Enhancement of exchange coupling and hard magnetic properties in nanocomposites by magnetic annealing,” Acta Mater., vol. 53, no. 15, pp. 4155–4161, Sep. 2005.

    Article  CAS  Google Scholar 

  20. B. Z. Cui, C. T. Yu, K. Han, J. P. Liu, H. Garmestani, M. J. Pechan, and H. J. Schneider-Muntau, “Magnetization reversal and nanostructure refinement in magnetically annealed Nd2Fe14B⁄α-Fe-type nanocomposites,” J. Appl. Phys., vol. 97, no. 10, p. 10F308, May 2005.

    Article  Google Scholar 

  21. B. Z. Cui, K. Han, Y. Zhang, J. P. Liu, H. Garmestani, S. Liu, and H. J. Schneider-Muntau, “Crystallization, morphology and magnetic properties of melt-spun (Nd,Pr,Dy)2(Fe,Co,Mo)14B/ alpha;-Fe nanocomposites,” IEEE Trans. Magn., vol. 40, no. 4, pp. 2867–2870, Jul. 2004.

    Article  CAS  Google Scholar 

  22. B. Z. Cui, K. Han, D. S. Li, H. Garmestani, J. P. Liu, N. M. Dempsey, and H. J. Schneider-Muntau, “Magnetic-field-induced crystallographic texture enhancement in cold-deformed FePt nanostructured magnets,” J. Appl. Phys., vol. 100, no. 1, p. 013902, Jul. 2006.

    Article  Google Scholar 

  23. B. Z. Cui, K. Han, H. Garmestani, and H. J. Schneider-Muntau, “Structure and magnetic properties of FePt and FePt–Ag nanostructured magnets by cyclic cold rolling,” J. Appl. Phys., vol. 99, no. 8, p. 08E910, Apr. 2006.

    Article  Google Scholar 

  24. K. Han, “Materials Processing Under the Influence of External Fields: High Magnetic Field Influences on Fabrication of Materials with Magnetic Phases.”

  25. S. Chikazumi, Physics of Ferromagnetism, 2 edition. Oxford: New York: Clarendon Press, 1997.

    Google Scholar 

  26. X. Wang, M. Qi, and S. Yi, “Crystallization behavior of bulk amorphous alloy Zr62Al8Ni13Cu17 under high magnetic field,” Scr. Mater., vol. 51, no. 11, pp. 1047–1050, Nov. 2004.

    Article  CAS  Google Scholar 

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Authors and Affiliations

  1. Department of Material Science and Engineering, Florida State University, Tallahassee, FL, 32304, USA

    Daniel R. Brown

  2. National High Magnetic Field Laboratory, Tallahassee, FL, 32310, USA

    Daniel R. Brown, Ke Han, Theo Siegrist, Tiglet Besara & Rongmei Niu

  3. Department of Chemical Engineering, Florida Agricultural and Mechanical University-Florida State University, Tallahassee, FL, 32304, USA

    Theo Siegrist

Authors
  1. Daniel R. Brown
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  2. Ke Han
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  4. Tiglet Besara
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  5. Rongmei Niu
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Brown, D.R., Han, K., Siegrist, T. et al. High Magnetic Field Annealing of Mn-Ga Intermetallic Alloys. MRS Advances 1, 227–233 (2016). https://doi.org/10.1557/adv.2015.26

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  • DOI: https://doi.org/10.1557/adv.2015.26