Subpicosecond magnetization dynamics in TbCo alloys
Subpicosecond magnetization dynamics in TbCo alloys
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DOI：
10.1103/physrevb.89.144404
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发表时间：
2014-04-03
影响因子：
3.7
通讯作者：
Aeschlimann, Martin
中科院分区：
文献类型：
--
作者：
Alebrand, Sabine;Bierbrauer, Ute;Aeschlimann, Martin
自从稀土过渡金属合金中的全光磁化翻转现象被发现以来，多子晶格磁体的磁化动力学已经成为现代磁学研究的热点。我们研究了TbCo合金的超快磁化动力学作为合金成分和激光能量密度的函数，使用800 nm或400 nm的探测脉冲。直接比较TbCo样品与不同的组成相同的激励条件下表明，强烈依赖于Tb浓度的Co亚晶格的磁化动力学。对于Tb32Co68，亚晶格的磁化甚至可以在亚皮秒时间尺度上瞬时反转。
Since the discovery of all-optical magnetization switching in rare-earth transition-metal alloys the underlying magnetization dynamics of multisublattice magnets has become a hot topic of modern magnetism. We studied the ultrafast magnetization dynamics in TbCo alloys as a function of the alloy composition and the laser fluence using either 800 nm or 400 nm probe pulses. Direct comparison between TbCo samples with different compositions for equal excitation conditions demonstrates that the magnetization dynamics of the Co sublattice strongly depends on the Tb concentration. For Tb32Co68 the magnetization of the sublattices can even transiently be reversed on a subpicosecond time scale.