The growth temperature and measurement temperature dependences of soft magnetic properties and effective damping parameter of (FeCo)-Al alloy thin films
Yusuke Ariake,
Shuang Wu,
Isao Kanada,
Tim Mewes,
Yoshitomo Tanaka,
Gary Mankey,
Claudia Mewes,
Takao Suzuki
Affiliations
Yusuke Ariake
The Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, AL 35487, USA
Shuang Wu
The Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, AL 35487, USA
Isao Kanada
The Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, AL 35487, USA
Tim Mewes
The Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, AL 35487, USA
Yoshitomo Tanaka
Materials Development Center, TDK Corporation, Narita, Chiba 286-0805, Japan
Gary Mankey
The Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, AL 35487, USA
Claudia Mewes
The Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, AL 35487, USA
Takao Suzuki
The Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, AL 35487, USA
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.
