TY - JOUR
T1 - Theory of chiral effects in magnetic textures with spin-orbit coupling
AU - Akosa, C. A.
AU - Takeuchi, A.
AU - Yuan, Z.
AU - Tatara, G.
N1 - Funding Information:
G.T. acknowledges financial support from Grant-in-Aid for Exploratory Research (No. 16K13853), Grant-in-Aid for Scientific Research (B) (No. 17H02929) from Japan Society for the Promotion of Science (JSPS ), Grant-in-Aid for Scientific Research on Innovative Areas (No. 26103006) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan and the Graduate School Materials Science in Mainz (DFG GSC 266). A.T. acknowledges financial support from Grant-in-Aid for Scientific Research (No. 17H02924) from JSPS. Z.Y. acknowledges financial support from the National Natural Science Foundation of China (Grants No. 61774018 and No. 11734004), the Recruitment Program of Global Youth Experts, and the Fundamental Research Funds for the Central Universities (Grant No. 2018EYT03). C.A.A. thanks A. Abbout and Y. Yamane for useful discussions.
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/11/21
Y1 - 2018/11/21
N2 - We present a theoretical study of two-dimensional spatially and temporally varying magnetic textures in the presence of spin-orbit coupling (SOC) of both the Rashba and Dresselhaus types. We show that the effective gauge field due to these SOCs, contributes to the dissipative and reactive spin torques in exactly the same way as in electromagnetism. Our calculations reveal that Rashba (Dresselhaus) SOC induces a chiral dissipation in interfacial (bulk) inversion asymmetric magnetic materials. Furthermore, we show that in addition to chiral dissipation αc, these SOCs also produce a chiral renormalization of the gyromagnetic ratio γ c, and show that the latter is intrinsically linked to the former via a simple relation αc=(τ/τex)γ c, where τex and τ are the exchange time and the electron relaxation time, respectively. Finally, we propose a theoretical scheme based on the Scattering theory to calculate and investigate the properties of damping in chiral magnets. Our findings should in principle provide a guide for material engineering of effects related to chiral dynamics in magnetic textures with SOC.
AB - We present a theoretical study of two-dimensional spatially and temporally varying magnetic textures in the presence of spin-orbit coupling (SOC) of both the Rashba and Dresselhaus types. We show that the effective gauge field due to these SOCs, contributes to the dissipative and reactive spin torques in exactly the same way as in electromagnetism. Our calculations reveal that Rashba (Dresselhaus) SOC induces a chiral dissipation in interfacial (bulk) inversion asymmetric magnetic materials. Furthermore, we show that in addition to chiral dissipation αc, these SOCs also produce a chiral renormalization of the gyromagnetic ratio γ c, and show that the latter is intrinsically linked to the former via a simple relation αc=(τ/τex)γ c, where τex and τ are the exchange time and the electron relaxation time, respectively. Finally, we propose a theoretical scheme based on the Scattering theory to calculate and investigate the properties of damping in chiral magnets. Our findings should in principle provide a guide for material engineering of effects related to chiral dynamics in magnetic textures with SOC.
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U2 - 10.1103/PhysRevB.98.184424
DO - 10.1103/PhysRevB.98.184424
M3 - Article
AN - SCOPUS:85057144756
VL - 98
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 2469-9950
IS - 18
M1 - 184424
ER -