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Magnetic domain compensation effect on the magnetodynamic response of ferromagnetic elements
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View: Figures


Image of FIG. 1.
FIG. 1.

Variation in anisotropy field , saturation magnetization , and easy axis coercivity with CoFeB content in the multilayer stack. is linearly increasing with CoFeB fraction , whereas is almost independent with and increases only slightly by 6%. The inset depicts quasistatic magnetic loops obtained from an extended CoFeB film, displaying clear easy and hard axis behavior.

Image of FIG. 2.
FIG. 2.

The precessional frequency square and effective damping parameter as a function of the relative CoFeB content determined for the extended reference films. is increasing with CoFeB content and hence with . The damping parameter displays only a minor change with .

Image of FIG. 3.
FIG. 3.

(a) Bias field dependence of for the structured Py and CoFeB films. From the permeability spectra of the square elements at (inset), the resonance frequency of the structured films of varying composition is deduced (b). The natural resonance frequency (at ) of the patterned samples displays neither a dependence on nor on the corresponding variation in the anisotropy field .

Image of FIG. 4.
FIG. 4.

(a) The remanent domain states of elements with relative CoFeB contents , 0.5, and 1 after applying a saturating initialization field along the easy axes. Arrows indicate the general easy and hard axis magnetization directions in the domains. (b) A magnetization canting and modulated substructure is schematically marked by arrows inside the closure domains. Responding to a pulse field the macrospin precession in domain structures of different anisotropy creates dynamic magnetic charges concentrated at the closure domain walls.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetic domain compensation effect on the magnetodynamic response of ferromagnetic elements