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Irradiation-induced tailoring of the magnetism of CoFeB/MgO ultrathin films
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Image of FIG. 1.
FIG. 1.

Field dependence of the ferromagnetic resonance frequencies for 1 nm thick Ta/CoFeB/MgO layers that have undergone either an annealing of 300 °C or an annealing of 100 °C with ion irradiation. Inset: PMOKE hysteresis loop for a fluence of . The coercivity is 0.35 mT.

Image of FIG. 2.
FIG. 2.

Example of a permeability spectrum recorded on 1 nm of CoFeB in an irradiated state for at an applied field of 0.86 T (red dots) perpendicular to the sample. The fit (bold black line) is done with an effective linewidth parameter that includes an inhomogeneous broadening contribution.

Image of FIG. 3.
FIG. 3.

Evolution of the magnetic properties with annealing at 300 °C (circles) or with irradiation for a Ta/CoFeB (1 nm)/MgO film which is amorphous in its initial state (empty rectangles). The lines are guide to the eye in all panels. Panel (a), squares: effective anisotropy field ; triangles: magneto-crystalline anisotropy fields . Panel (b): spectroscopic splitting factor . Panel (c), black squares: magnetization obtained from the moments measured in AGFM and assuming an invariant CoFeB thickness of 1 nm; green triangles: Kerr rotation at magnetization saturation. Panel (d): Gilbert damping factor.

Image of FIG. 4.
FIG. 4.

Changes in the concentration profiles as simulated assuming linear collisional mixing for a fluence of . Negative values indicate a deficit of material.


Generic image for table
Table I.

Parameters used for the collisional mixing simulation.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Irradiation-induced tailoring of the magnetism of CoFeB/MgO ultrathin films