Dependence of magnetization dynamics on magnetostriction in NiFe alloys

Abstract

We present a quantitative, systematic study of the effect of magnetostriction on the dynamical properties in NiFe alloys. Both the ferromagnetic resonance frequency and the damping times are correlated to the magnetostriction. In addition, we find that the Gilbert damping parameter varies by more than 100% over the range of Ni percentage tested (61.9%–86.7%).

Determination of intrinsic FMR line broadening in ferromagnetic (Fe44Co56)77Hf12N11 nanocomposite films

“…This is close to the value for a int determined by the power law [13,14], which results in 0.0074. The slight difference between these two values may arise from marginal magnetoelastic effects, which are neglected.…”

Spin pumping and spin transfer

“…The intercept at L = 0,G if , allows us to extract the damping enhancement 45 but here we focus on the bulk properties and leave consideration of the material dependence of the interface enhancement for later study. The value of α determined from the slope ofG(L)/(γµ s A) is 0.0046 ± 0.0001 that is at the lower end of the range of values 0.004 − 0.013 measured at room temperature for Py 17,18,[120][121][122][123][124][125][126][127][128][129][130][131] . Fig.…”

Calculating the transport properties of magnetic materials from first principles including thermal and alloy disorder, noncollinearity, and spin-orbit coupling

“…The value of α extracted from the slope of G(L)/(γµ s A) is 0.0046 ± 0.0002, which falls at the lower end of a range of values, 0.004 − 0.013, reported in the literature for measurements at room temperature. 22,[24][25][26][27]39,40,73,[105][106][107][108][109][110][111][112][113][114] Very recently, measurements were carried out as a function of temperature from room temperature (RT) to low tem-peratures, decomposing the damping into bulk and interface contributions. 40 These yield a value for the bulk damping of 0.0048 ± 0.0003 at 5 K in remarkably good agreement with the value calculated above (that has been confirmed by subsequent coherent potential approximation calculations 36,37 within the error bars of the calculations).…”