Final published version
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Inertial Spin Dynamics in Epitaxial Cobalt Films
AU - Unikandanunni, V.
AU - Medapalli, R.
AU - Asa, M.
AU - Albisetti, E.
AU - Petti, D.
AU - Bertacco, R.
AU - Fullerton, E.E.
AU - Bonetti, S.
N1 - Export Date: 21 December 2022 Funding details: U.S. Department of Energy, USDOE Funding details: Office of Science, SC Funding details: Basic Energy Sciences, BES, DE-SC0003678 Funding details: European Research Council, ERC, 715452 Funding text 1: V. U. and S. B. acknowledge support from the European Research Council, Starting Grant No. 715452 “MAGNETIC-SPEED-LIMIT.” R. M. and E. E. F. were supported by U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-SC0003678.
PY - 2022/12/2
Y1 - 2022/12/2
N2 - We investigate the spin dynamics driven by terahertz magnetic fields in epitaxial thin films of cobalt in its three crystalline phases. The terahertz magnetic field generates a torque on the magnetization which causes it to precess for about 1 ps, with a subpicosecond temporal lag from the driving force. Then, the magnetization undergoes natural damped THz oscillations at a frequency characteristic of the crystalline phase. We describe the experimental observations solving the inertial Landau-Lifshitz-Gilbert equation. Using the results from the relativistic theory of magnetic inertia, we find that the angular momentum relaxation time η is the only material parameter needed to describe all the experimental evidence. Our experiments suggest a proportionality between η and the strength of the magnetocrystalline anisotropy.
AB - We investigate the spin dynamics driven by terahertz magnetic fields in epitaxial thin films of cobalt in its three crystalline phases. The terahertz magnetic field generates a torque on the magnetization which causes it to precess for about 1 ps, with a subpicosecond temporal lag from the driving force. Then, the magnetization undergoes natural damped THz oscillations at a frequency characteristic of the crystalline phase. We describe the experimental observations solving the inertial Landau-Lifshitz-Gilbert equation. Using the results from the relativistic theory of magnetic inertia, we find that the angular momentum relaxation time η is the only material parameter needed to describe all the experimental evidence. Our experiments suggest a proportionality between η and the strength of the magnetocrystalline anisotropy.
U2 - 10.1103/PhysRevLett.129.237201
DO - 10.1103/PhysRevLett.129.237201
M3 - Journal article
VL - 129
JO - Physical review letters
JF - Physical review letters
SN - 1079-7114
IS - 23
M1 - 237201
ER -