Characterization of the Interfacial Dzyaloshinskii-Moriya Interaction in Pt/Co2FeAl0.5Si0.5 Ultrathin Films by Brillouin Light Scattering

Brillouin light scattering (BLS) combined with vibrating sample magnetometry (VSM) have been used to investigate the Dzyaloshinskii-Moriya interaction (DMI) in Pt-buffered Co 2 FeAl 0.5 Si 0.5 ultrathin films of various thicknesses. VSM measurements of the Co 2 FeAl 0.5 Si 0.5 (CFAS) thickness depen...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2017-11, Vol.53 (11), p.1-5
Main Authors: Belmeguenai, M., Gabor, M. S., Roussigne, Y., Cherif, S. M., Stashkevich, A., Petrisor, T., Mos, R. B., Tiusan, C.
Format: Article
Language:English
Subjects:
Brillouin light scattering (BLS)
Cobalt
Dzyaloshinskii–Moriya interaction (DMI)
interface anisotropy
Light scattering
Magnetic field measurement
Magnetic fields
Magnetic hysteresis
Magnetic moments
Magnetism
Magnetization
magnetization dynamics
Magnetometers
Magnons
Reciprocity
Saturation
Saturation magnetization
spin waves (SWs)
Thin films
Wave propagation
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Summary:Brillouin light scattering (BLS) combined with vibrating sample magnetometry (VSM) have been used to investigate the Dzyaloshinskii-Moriya interaction (DMI) in Pt-buffered Co 2 FeAl 0.5 Si 0.5 ultrathin films of various thicknesses. VSM measurements of the Co 2 FeAl 0.5 Si 0.5 (CFAS) thickness dependence of the saturation magnetic moment per unit area revealed a magnetization at saturation of 1286 emu/cm 3 and 0.31 nm magnetic dead layer. Furthermore, thickest films (t CFAS >1 nm) are in-plane magnetized, while the thinner ones are perpendicular magnetized. BLS measurements, in the Damon-Eshbach geometry, under an in-plane applied magnetic field revealed the non-reciprocity of the spin waves (SWs) propagating in opposite directions (Stokes and antiStokes lines) due to the Pt-induced DMI. Stokes and anti-Stokes lines' frequency mismatch varies linearly as function of the SW vector allowing the determination of the effective DMI constant. Its thickness dependence leads to determine a value of -0.42 pJ/m for the DMI interface constant, which is significantly lower than that of Pt/Co/AlO x films. Moreover, BLS measurements revealed that the effective magnetization varies linearly with the reciprocal effective CFAS thickness due to the perpendicular interface anisotropy, estimated to be 0.49 mJ/m 2 , which reinforces the perpendicular magnetization easy axis.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2017.2696241