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Inertial Spin Dynamics in Epitaxial Cobalt Films
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- Unikandanunni, Vivek, 1993- (author)
- Stockholms universitet,Fysikum
- Medapalli, Rajasekhar (author)
- Asa, Marco (author)
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- Albisetti, Edoardo (author)
- Petti, Daniela (author)
- Bertacco, Riccardo (author)
- Fullerton, Eric E. (author)
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- (creator_code:org_t)
- 2022
- 2022
- English.
- In: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 129:23
- Journal article (peer-reviewed)
Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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- art (subject category)
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