TY - JOUR
T1 - First-Principles Study on the Magnetic Damping of Transition Metals in the Presence of Spin Fluctuation
AU - Ozaki, Dai
AU - Miura, Daisuke
AU - Sakuma, Akimasa
N1 - Funding Information:
ACKNOWLEDGMENT The authors would like to thank K. Hyodo and N. Kobayashi for the enlightening discussions. This work was supported in part by JSPS KAKENHI under Grant 16K06702 and Grant 17K14800 and in part by CSRN, Japan.
Publisher Copyright:
© 1965-2012 IEEE.
PY - 2017/11
Y1 - 2017/11
N2 - We calculated, from first principles, the Landau frequency λ to investigate the effects of spin fluctuation on the magnetic damping of Fe and Ni metals as well as L10 -type ordered alloys, namely, FePt, CoPt, FePd, and MnAl, assuming random arrangements of spins as an effect of thermal activation through coherent potential approximation and the tight-binding linear muffin-tin orbital method. The results show that the λ of these systems are similar to conductivity in the weak spin fluctuation region and resistivity in the strong fluctuation region as well as in the lattice vibration system. Qualitatively, this behavior is consistent with the experimental results for temperature dependence of the λ of Fe and Ni metals. For L10-type alloys, the magnitude of the magnetic damping is in the following (decreasing) order: CoPt, FePt, FePd, and MnAl.
AB - We calculated, from first principles, the Landau frequency λ to investigate the effects of spin fluctuation on the magnetic damping of Fe and Ni metals as well as L10 -type ordered alloys, namely, FePt, CoPt, FePd, and MnAl, assuming random arrangements of spins as an effect of thermal activation through coherent potential approximation and the tight-binding linear muffin-tin orbital method. The results show that the λ of these systems are similar to conductivity in the weak spin fluctuation region and resistivity in the strong fluctuation region as well as in the lattice vibration system. Qualitatively, this behavior is consistent with the experimental results for temperature dependence of the λ of Fe and Ni metals. For L10-type alloys, the magnitude of the magnetic damping is in the following (decreasing) order: CoPt, FePt, FePd, and MnAl.
KW - First-principles calculation
KW - Gilbert damping
KW - spin fluctuation
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U2 - 10.1109/TMAG.2017.2696057
DO - 10.1109/TMAG.2017.2696057
M3 - Article
AN - SCOPUS:85032996306
SN - 0018-9464
VL - 53
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 11
M1 - 7906565
ER -