Unidirectional and uniaxial anisotropies in the MnN/CoFeB exchange bias system

Rai A, Dunz M, Sapkota A, Zilske P, Mohammadi JB, Meinert M, Mewes C, Mewes T (2019)
Journal of Magnetism and Magnetic Materials 485: 374-380.

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Zeitschriftenaufsatz | E-Veröff. vor dem Druck | Englisch
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Abstract / Bemerkung
We report on broadband and in-plane angle dependent ferromagnetic resonance measurements of MnN (30 nm)/CoFeB (t(CoFeB)) exchange bias bilayer systems with CoFeB thicknesses ranging from 5 to 20 nm. We find that the strong unidirectional anisotropy in this system is accompanied by a strong uniaxial in-plane anisotropy and a small interfacial perpendicular anisotropy (K-perpendicular to,K- i = 0.043 +/- 0.001 erg/cm(2)). The strength of the interfacial exchange bias coupling in this system Delta sigma(eb) = 0.193 +/- 0.005 erg/cm(2) is only 2.5 times larger than the interfacial uniaxial coupling strength Delta sigma(u) = 0.076 +/- 0.003 erg/cm(2). The relaxation in this system also shows a strong unidirectional and uniaxial in-plane anisotropy. While the observed thickness dependence of the uniaxial anisotropy of the relaxation is consistent with an interfacial two-magnon scattering contribution, we find that this is not the case for the unidirectional relaxation.
Erscheinungsjahr
Zeitschriftentitel
Journal of Magnetism and Magnetic Materials
Band
485
Seite(n)
374-380
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Rai A, Dunz M, Sapkota A, et al. Unidirectional and uniaxial anisotropies in the MnN/CoFeB exchange bias system. Journal of Magnetism and Magnetic Materials. 2019;485:374-380.
Rai, A., Dunz, M., Sapkota, A., Zilske, P., Mohammadi, J. B., Meinert, M., Mewes, C., et al. (2019). Unidirectional and uniaxial anisotropies in the MnN/CoFeB exchange bias system. Journal of Magnetism and Magnetic Materials, 485, 374-380. doi:10.1016/j.jmmm.2019.04.043
Rai, A., Dunz, M., Sapkota, A., Zilske, P., Mohammadi, J. B., Meinert, M., Mewes, C., and Mewes, T. (2019). Unidirectional and uniaxial anisotropies in the MnN/CoFeB exchange bias system. Journal of Magnetism and Magnetic Materials 485, 374-380.
Rai, A., et al., 2019. Unidirectional and uniaxial anisotropies in the MnN/CoFeB exchange bias system. Journal of Magnetism and Magnetic Materials, 485, p 374-380.
A. Rai, et al., “Unidirectional and uniaxial anisotropies in the MnN/CoFeB exchange bias system”, Journal of Magnetism and Magnetic Materials, vol. 485, 2019, pp. 374-380.
Rai, A., Dunz, M., Sapkota, A., Zilske, P., Mohammadi, J.B., Meinert, M., Mewes, C., Mewes, T.: Unidirectional and uniaxial anisotropies in the MnN/CoFeB exchange bias system. Journal of Magnetism and Magnetic Materials. 485, 374-380 (2019).
Rai, Anish, Dunz, Mareike, Sapkota, Arjun, Zilske, Philipp, Mohammadi, Jamileh Beik, Meinert, Markus, Mewes, Claudia, and Mewes, Tim. “Unidirectional and uniaxial anisotropies in the MnN/CoFeB exchange bias system”. Journal of Magnetism and Magnetic Materials 485 (2019): 374-380.