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arXiv 1111.6435cond-mat.mtrl-sci
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FeRh中laser诱导相变的结构和磁性动力学

Structural and magnetic dynamics of a laser induced phase transition in FeRh

S. O. Mariager, F. Pressacco, G. Ingold, E. Mancini, A. Caviezel, E. Möhr-Vorobeva, P. Beaud, S. L. Johnson, C. J. Milne, S. Moyerman, E. Fullerton, R. Feidenha… 展开作者

S. O. Mariager, F. Pressacco, G. Ingold, E. Mancini, A. Caviezel, E. Möhr-Vorobeva, P. Beaud, S. L. Johnson, C. J. Milne, S. Moyerman, E. Fullerton, R. Feidenhans'l, C. H. Back, C. Quitmann

摘要:

利用时间分辨X射线衍射和磁光克尔效应研究了激光诱导FeRh的反铁磁-铁磁相变。结构响应由独立铁磁畴的形核(τ_1 ~ 30 ps)给出。这明显快于随后的磁畴重排所给出的磁响应(τ_2 ~ 60 ps)。X射线衍射表明,这两个阶段共存的短时间尺度和相变是有限的声速。提出了一个描述结构和磁动力学的成核模型。

英文摘要:

We use time-resolved x-ray diffraction and magnetic optical Kerr effect to study the laser induced antiferromagnetic to ferromagnetic phase transition in FeRh. The structural response is given by the nucleation of independent ferromagnetic domains (τ_1 ~ 30ps). This is significantly faster than the magnetic response (τ_2 ~ 60ps) given by the subsequent domain realignment. X-ray diffraction shows that the two phases co-exist on short time-scales and that the phase transition is limited by the speed of sound. A nucleation model describing both the structural and magnetic dynamics is presented.

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