Magnetic and structural properties of L1-Mn50Ga50-xAlx epitaxially grown thin films

Epitaxially grown L10- MnGa(Al) continuous thin films with the c-axis along the film normal are successfully fabricated on MgO (001) substrates at a substrate deposition temperature Ts of around 400 °C. The order parameter S is found to decrease with Al content, except for that for Al = 0. The films...

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Veröffentlicht in:AIP advances 2019-03, Vol.9 (3)
Hauptverfasser: Kamiya, Keisuke, Zhao, Siqian, Tanaka, Yoshitomo, Mankey, Gary, Suzuki, Takao
Format: Artikel
Sprache:eng
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Zusammenfassung:Epitaxially grown L10- MnGa(Al) continuous thin films with the c-axis along the film normal are successfully fabricated on MgO (001) substrates at a substrate deposition temperature Ts of around 400 °C. The order parameter S is found to decrease with Al content, except for that for Al = 0. The films under consideration exhibit the perpendicular magnetic anisotropy constant Ku of about 1 x 107 erg/cm3 at 300 K. In order to clarify the magnetic anisotropy mechanism, the correlation between Ms(T) and Ku(T) is discussed. It is found that the values of n in the power law relation Ku(T) ∼ Ms(T)n are found to be 2.6, 2.3, and 2.0 for the films of 2.5, 5.6, 11.2 Al at%, respectively. The present result suggests that the magnetic anisotropy of L10-MnGaAl thin films may be explained in terms of the two-ion model, where both the contributions of Mn and Ga are significant to the total magnetic anisotropy”. The decrease of the value n with Al addition n is of interest, but the reason for this change is not understood at present.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.5079878