The growth temperature and measurement temperature dependences of soft magnetic properties and effective damping parameter of (FeCo)-Al alloy thin films

• Published in: AIP advances 2018-05, Vol.8 (5), p.056119-056119-6
• Main Authors: Ariake, Yusuke, Wu, Shuang, Kanada, Isao, Mewes, Tim, Tanaka, Yoshitomo, Mankey, Gary, Mewes, Claudia, Suzuki, Takao
• Format: Article
• Language: English
• Subjects: Aluminum base alloys; Damping; Ferromagnetic materials; Ferromagnetic resonance; Linearity; Magnetic properties; Parameters; Temperature dependence; Temperature effects; Thin films
• ISSN: 2158-3226; 2158-3226
• DOI: 10.1063/1.5007744

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.