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Damping of CoxFe80−xB20 ultrathin films with perpendicular magnetic anisotropy
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Image of FIG. 1.
FIG. 1.

Field dependence of the ferromagnetic resonance frequencies for various 1 nm thick Ta/CoFeB/MgO layers. The data for the annealed crystalline (as-grown amorphous) samples appear in negative (positive) fields. The line is a fit through Co60Fe20B20, in the as-grown (amorphous) state.

Image of FIG. 2.
FIG. 2.

Example of a permeability spectrum recorded on 1 nm of Co40Fe40B20 in the as-grown (amorphous) state for an applied field of 1 T (red dots) perpendicular to the sample. The fit (bold black line) is done using the parameters of Table I , i.e., an “effective” damping at the resonance frequency of 34 GHz. A scaling factor has been applied to the experimental susceptibility level to account for the space filling factor.

Image of FIG. 3.
FIG. 3.

Gilbert damping parameter versus the square increment of the Landé factor for various Co x Fe y B z alloys. Our data are the black symbols. The line is a guide to the eye. The 3 items falling near the line are the point, then the data from Ref. 2 , and Ref. 8 with the g-factor of Ref. 13 . The symbol falling away from line is from Ref. 6 .


Generic image for table
Table I.

Table of the magnetic properties extracted from VNAFMR measurements on 1 nm Ta/CoFeB/MgO films and comparison with relevant literature values.“a-” stands for amorphous as-grown state.“c-” stands for crystalline annealed state. The error bars apply to the first six raws.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Damping of CoxFe80−xB20 ultrathin films with perpendicular magnetic anisotropy