Resolving The Genuine Laser-Induced Ultrafast Dynamics Of Exchange Interaction In Ferromagnet/Antiferromagnet Bilayers

PHYSICAL REVIEW B(2010)

引用 20|浏览9
暂无评分
摘要
The response of exchange coupled ferromagnet/antiferromagnet metallic bilayers to laser excitation down to the femtosecond time scale is investigated. Differently from previous attempts, the ultrafast dynamics of exchange interaction is deduced by carefully analyzing precessional transients of the ferromagnetic magnetization, measured by means of time-resolved magneto-optical Kerr effect, rather than by monitoring changes in the hysteresis loop as a function of pump-probe delay. Thereby we are able to estimate the characteristic time scale of laser-induced exchange-bias quenching in a polycrystalline Co/IrMn bilayer, tau(EB,0) = (0.7 +/- 0.5) ps. The fast decrease in exchange coupling upon laser heating is attributed to a spin disorder at the interface created by laser heating.
更多
查看译文
关键词
exchange interaction,magnetic properties,thin film,magneto optical kerr effect,exchange bias,hysteresis loop
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要