Abstract
The soft magnetic properties and effective damping parameters of Fe73Co25Al2 alloy thin films are discussed. The effective damping parameter αeff measured by ferromagnetic resonance for the 10 nm-thick sample is nearly constant (≈0.004 ± 0.0008) for a growth temperature Ts from ambient to 200 °C, and then tends to decrease for higher temperatures and αeff is 0.002 ± 0.0004 at Ts = 300 °C. For the 80 nm-thick sample, the αeff seems to increase with Ts from αeff = 0.001 ± 0.0002 at Ts = ambient to αeff = 0.002 ± 0.0004. The αeff is found nearly constant (αeff = 0.004 ± 0.0008) over a temperature range from 10 to 300 K for the 10 nm films with the different Ts (ambient, 100 and 200 °C). Together with an increasing non-linearity of the frequency dependence of the linewidth at low Ts, extrinsic contributions such as two-magnon scattering dominate the observed temperature dependence of effective damping and linewidth.
Highlights
For future high frequency device applications of soft magnetic thin films, further improvement in saturation magnetization (Ms), permeability (μ), coercivity (Hc), eddy current loss and damping parameter is indispensable.[1]
transmission electron microscopy (TEM) cross-sectional image and the electron diffraction pattern for Fe73Co25Al2 alloy thin films deposited at ambient onto MgO (100) substrate.[3] (200)bcc separated at every 90 degree
For the 80 nm-thick sample, there is much scatter in the data points, the αeff seems to increase with Ts from αeff = 0.001 ± 0.0002 at Ts = ambient to αeff = 0.002 ± 0.0004
Summary
For future high frequency device applications of soft magnetic thin films, further improvement in saturation magnetization (Ms), permeability (μ), coercivity (Hc), eddy current loss and damping parameter (αeff) is indispensable.[1].
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