Hot spin spots in the laser-induced demagnetization
Laser-induced femtosecond magnetism or femtomagnetism simultaneously relies on two distinctive contributions: (a) the optical dipole interaction (ODI) between a laser field and a magnetic system and (b) the spin expectation value change (SEC) between two transition states. Surprisingly, up to now, n...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2012-03-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.3693402 |
| _version_ | 1819263973387665408 |
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| author | M. S. Si G. P. Zhang |
| author_facet | M. S. Si G. P. Zhang |
| author_sort | M. S. Si |
| collection | DOAJ |
| description | Laser-induced femtosecond magnetism or femtomagnetism simultaneously relies on two distinctive contributions: (a) the optical dipole interaction (ODI) between a laser field and a magnetic system and (b) the spin expectation value change (SEC) between two transition states. Surprisingly, up to now, no study has taken both contributions into account simultaneously. Here we do so by introducing a new concept of the optical spin generator, a product of SEC and ODI between transition states. In ferromagnetic nickel, our first-principles calculation demonstrates that the larger the value of optical spin generator is, the larger the dynamic spin moment change is. This simple generator directly links the time-dependent spin moment change ΔMzk(t) at every crystal-momentum k point to its intrinsic electronic structure and magnetic properties. Those hot spin spots are a direct manifestation of the optical spin generator, and should be the focus of future research. |
| first_indexed | 2024-12-23T20:22:06Z |
| format | Article |
| id | doaj.art-ec2de612160b4530a3ea99974ec8da04 |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-12-23T20:22:06Z |
| publishDate | 2012-03-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-ec2de612160b4530a3ea99974ec8da042022-12-21T17:32:30ZengAIP Publishing LLCAIP Advances2158-32262012-03-0121012158012158-610.1063/1.3693402059201ADVHot spin spots in the laser-induced demagnetizationM. S. Si0G. P. Zhang1Department of Physics, Indiana State University, Terre Haute, Indiana 47809, USADepartment of Physics, Indiana State University, Terre Haute, Indiana 47809, USALaser-induced femtosecond magnetism or femtomagnetism simultaneously relies on two distinctive contributions: (a) the optical dipole interaction (ODI) between a laser field and a magnetic system and (b) the spin expectation value change (SEC) between two transition states. Surprisingly, up to now, no study has taken both contributions into account simultaneously. Here we do so by introducing a new concept of the optical spin generator, a product of SEC and ODI between transition states. In ferromagnetic nickel, our first-principles calculation demonstrates that the larger the value of optical spin generator is, the larger the dynamic spin moment change is. This simple generator directly links the time-dependent spin moment change ΔMzk(t) at every crystal-momentum k point to its intrinsic electronic structure and magnetic properties. Those hot spin spots are a direct manifestation of the optical spin generator, and should be the focus of future research.http://dx.doi.org/10.1063/1.3693402 |
| spellingShingle | M. S. Si G. P. Zhang Hot spin spots in the laser-induced demagnetization AIP Advances |
| title | Hot spin spots in the laser-induced demagnetization |
| title_full | Hot spin spots in the laser-induced demagnetization |
| title_fullStr | Hot spin spots in the laser-induced demagnetization |
| title_full_unstemmed | Hot spin spots in the laser-induced demagnetization |
| title_short | Hot spin spots in the laser-induced demagnetization |
| title_sort | hot spin spots in the laser induced demagnetization |
| url | http://dx.doi.org/10.1063/1.3693402 |
| work_keys_str_mv | AT mssi hotspinspotsinthelaserinduceddemagnetization AT gpzhang hotspinspotsinthelaserinduceddemagnetization |