TY - JOUR
T1 - Theoretical study on gilbert damping of nonuniform magnetization precession in ferromagnetic metals
AU - Umetsu, Nobuyuki
AU - Miura, Daisuke
AU - Sakuma, Akimasa
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012/11
Y1 - 2012/11
N2 - We study Gilbert damping in bulk metallic ferromagnets containing magnetic and nonmagnetic impurities in the presence of nonuniform magnetization precession. In this model, a microscopic expression for the Gilbert damping tensor is obtained using the linear response theory with respect to the interaction between magnetization and conduction electrons. We especially focus on a diagonal element of the tensor, which is a conventional Gilbert damping constant, and evaluate it numerically as a function of the wave vector q of magnetization precession. We show that the impurity scattering dominates Gilbert damping for 0 < |q| < k F↔ - k F↓, while the Stoner excitation dominates for k F↔ - k F↓ < |q| < k F↔ + k F↓ (k Fσ is the Fermi wave number for σ spin electrons).
AB - We study Gilbert damping in bulk metallic ferromagnets containing magnetic and nonmagnetic impurities in the presence of nonuniform magnetization precession. In this model, a microscopic expression for the Gilbert damping tensor is obtained using the linear response theory with respect to the interaction between magnetization and conduction electrons. We especially focus on a diagonal element of the tensor, which is a conventional Gilbert damping constant, and evaluate it numerically as a function of the wave vector q of magnetization precession. We show that the impurity scattering dominates Gilbert damping for 0 < |q| < k F↔ - k F↓, while the Stoner excitation dominates for k F↔ - k F↓ < |q| < k F↔ + k F↓ (k Fσ is the Fermi wave number for σ spin electrons).
KW - Gilbert damping
KW - Landau-Lifshitz-Gilbert equation
KW - Spintronics
KW - Transverse spin susceptibility
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U2 - 10.1143/JPSJ.81.114716
DO - 10.1143/JPSJ.81.114716
M3 - Article
AN - SCOPUS:84870187029
VL - 81
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 11
M1 - 114716
ER -