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  Direct measurement of the magnetic anisotropy field in Mn-Ga and Mn-Co-Ga Heusler films

Fowley, C., Ouardi, S., Kubota, T., Yildirim, O., Neudert, A., Lenz, K., et al. (2015). Direct measurement of the magnetic anisotropy field in Mn-Ga and Mn-Co-Ga Heusler films. Journal of Physics D: Applied Physics, 48: 164006, pp. 1-6. doi:10.1088/0022-3727/48/16/164006.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-CADD-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-CADE-0
Genre: Journal Article

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 Creators:
Fowley, Ciarán1, Author
Ouardi, Siham2, Author              
Kubota, Takahide1, Author
Yildirim, Oguz1, Author
Neudert, Andreas1, Author
Lenz, Kilian1, Author
Sluka, Volker1, Author
Lindner, Jürgen1, Author
Law, Joseph M.1, Author
Mizukami, Shigemi1, Author
Fecher, Gerhard H.3, Author              
Felser, Claudia4, Author              
Deac, Alina M.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Siham Ouardi, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863439              
3Gerhard Fecher, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863431              
4Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: The static and dynamic magnetic properties of tetragonally distorted Mn-Ga based alloys were investigated. Static properties are determined in magnetic fields up to 6.5 T using SQUID magnetometry. For the pure Mn1.6Ga film, the saturation magnetisation is 0.36 MA m(-1) and the coercivity is 0.29 T. Partial substitution of Mn by Co results in Mn2.6Co0.3Ga1.1. The saturation magnetisation of those films drops to 0.2 MA m(-1) and the coercivity is increased to 1 T. The time-resolved magneto-optical Kerr effect (TR-MOKE) is used to probe the high-frequency dynamics of Mn-Ga. The ferromagnetic resonance frequency extrapolated to zero-field is found to be 125 GHz with a Gilbert damping, alpha, of 0.019. The anisotropy field is determined from both SQUID and TR-MOKE to be 4.5 T, corresponding to an effective anisotropy density of 0.81 MJ m(-3). Given the large anisotropy field of the Mn2.6Co0.3Ga1.1 film, pulsed magnetic fields up to 60 T are used to determine the field strength required to saturate the film in the plane. For this, the extraordinary Hall effect was employed as a probe of the local magnetisation. By integrating the reconstructed in-plane magnetisation curve, the effective anisotropy energy density for Mn2.6Co0.3Ga1.1 is determined to be 1.23 MJ m(-3).

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 Dates: 2015-04-292015-04-08
 Publication Status: Published in print
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Title: Journal of Physics D: Applied Physics
  Abbreviation : J. Phys. D: Appl. Phys.
Source Genre: Journal
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Publ. Info: Bristol : IOP Publishing
Pages: - Volume / Issue: 48 Sequence Number: 164006 Start / End Page: 1 - 6 Identifier: ISSN: 0022-3727
CoNE: /journals/resource/0022-3727