Damping properties in the free layers of tunnel magneto-resistance (TMR) readers were reported. The study used a free layer sample consisting of the same stacking structure as in TMR readers, involved comprehensive ferromagnetic resonance (FMR) measurements, and included numerical analysis of the FMR data. The results indicate that the free layer shows a Gilbert damping constant of 8.1 × 10−3. When the free layer is magnetized with a field which is not normal to the film plane, two-magnon scattering also occurs, although its contribution to the relaxation is at least 2.5 times smaller than the Gilbert contribution.
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Lü et al. (2014) studied this question.
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