Nanorod Surface Plasmon Enhancement of Laser-Induced Ultrafast Demagnetization
| dc.contributor.author | Xu, Haitian | |
| dc.contributor.author | Hajisalem, Ghazal | |
| dc.contributor.author | Steeves, Geoffrey M. | |
| dc.contributor.author | Gordon, Reuven | |
| dc.contributor.author | Choi, Byoung C. | |
| dc.date.accessioned | 2016-04-22T21:45:20Z | |
| dc.date.available | 2016-04-22T21:45:20Z | |
| dc.date.copyright | 2015 | en_US |
| dc.date.issued | 2015-10-30 | |
| dc.description.abstract | Ultrafast laser-induced magnetization dynamics in ferromagnetic thin films were measured using a femtosecond Ti:sapphire laser in a pump-probe magneto-optic Kerr effect setup. The effect of plasmon resonance on the transient magnetization was investigated by drop-coating the ferromagnetic films with dimensionally-tuned gold nanorods supporting longitudinal surface plasmon resonance near the central wavelength of the pump laser. With ~4% nanorod areal coverage, we observe a >50% increase in demagnetization signal in nanorod-coated samples at pump fluences on the order of 0.1 mJ/cm2 due to surface plasmon-mediated localized electric-field enhancement, an effect which becomes more significant at higher laser fluences. We were able to qualitatively reproduce the experimental observations using finite-difference time-domain simulations and mean-field theory. This dramatic enhancement of ultrafast laser-induced demagnetization points to possible applications of nanorod-coated thin films in heat-assisted magnetic recording. | en_US |
| dc.description.reviewstatus | Reviewed | en_US |
| dc.description.scholarlevel | Faculty | en_US |
| dc.description.sponsorship | This work was supported by the NSERC Discovery Grant program and the NSERC Strategic Project Grant: Development and Validation of a Nanophotonics Simulation Toolbox. | en_US |
| dc.identifier.citation | Xu, H., Hajisalem, G., Steeves, G.M., Gordon, R. & Choi, B.C. (2015). Nanorod surface plasmon enhancement of laser-induced ultrafast demagnetization. Nature: Scientific Reports, 5(15933), 1-6. | en_US |
| dc.identifier.uri | http://dx.doi.org/10.1038/srep15933 | |
| dc.identifier.uri | http://hdl.handle.net/1828/7173 | |
| dc.language.iso | en | en_US |
| dc.publisher | Nature: Scientific Reports | en_US |
| dc.rights | Attribution 2.5 Canada | * |
| dc.rights.uri | http://creativecommons.org/licenses/by/2.5/ca/ | * |
| dc.subject.department | Department of Electrical and Computer Engineering | |
| dc.subject.department | Department of Physics and Astronomy | |
| dc.title | Nanorod Surface Plasmon Enhancement of Laser-Induced Ultrafast Demagnetization | en_US |
| dc.type | Article | en_US |