Role of the Cr Buffer Layer in the Thickness-Dependent Ultrafast Magnetization Dynamics of Co2Fe0.4Mn0.6Si Heusler Alloy Thin Films

Pan, Santanu ; Seki, Takeshi ; Takanashi, Koki ; Barman, Anjan (2017) Role of the Cr Buffer Layer in the Thickness-Dependent Ultrafast Magnetization Dynamics of Co2Fe0.4Mn0.6Si Heusler Alloy Thin Films Physical Review Applied, 7 (6). ISSN 2331-7019

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Official URL: http://doi.org/10.1103/PhysRevApplied.7.064012

Related URL: http://dx.doi.org/10.1103/PhysRevApplied.7.064012

Abstract

The epitaxial growth of Co2Fe0.4Mn0.6Si (CFMS) Heusler alloy on MgO with high crystal orientation requires the use of buffer layer. The utilization of Cr buffer layer in a controlled manner without hampering the intrinsic CFMS properties remains a challenge. Here, we have epitaxially grown the CFMS films on Cr buffered MgO substrate and investigated the thickness (t)-dependent variation in structural ordering, and its impact on magnetic Gilbert damping and magnetic anisotropy. We observed a regular improvement in the crystal structure with increasing t, which caused similar increasing trend in saturation magnetization and magneto-crystalline anisotropy (MCA). Interestingly, we achieved a very low t-independent value of Gilbert damping parameter (α) of ~ 0.0045 because of unaltered atomic site ordering which indicates different origin of MCA and α in this system. Notably, α also remains nearly independent of frequency (f) for lower thickness regime in these CFMS films. The observation of t-independent and f-independent value of α strongly suggests the suitability of thinner CFMS film for device applications in broadband frequency regime.

Item Type:Article
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ID Code:116202
Deposited On:07 Apr 2021 10:33
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