Nanorod Surface Plasmon Enhancement of Laser-Induced Ultrafast Demagnetization

被引：17

作者：

Xu, Haitian ^{[1
]}

Hajisalem, Ghazal ^{[2
]}

Steeves, Geoffrey M. ^{[1
]}

Gordon, Reuven ^{[2
]}

Choi, Byoung C. ^{[1
]}

机构：

[1] Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 5C2, Canada

[2] Univ Victoria, Dept Elect & Comp Engn, Victoria, BC V8P 5C2, Canada

来源：

SCIENTIFIC REPORTS | 2015年 / 5卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

NANOPARTICLES; FEMTOSECOND; TRANSDUCER; ENERGY; SHAPE;

D O I：

10.1038/srep15933

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 similar to 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/cm(2) 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.

引用

页数：7

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