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研究领域物理科学原子,分子和光学物理太赫兹物理
超快的爱因斯坦-德哈斯效应

超快的爱因斯坦-德哈斯效应

C Dornes ¹, Y Acremann ², M Savoini ³, M Kubli ³, M J Neugebauer ³, E Abreu ³, L Huber ³, G Lantz ³, C A F Vaz ⁴, H Lemke ⁵, E M Bothschafter ⁴, M Porer ⁴, V Esposito ⁴, L Rettig ^4,6, M Buzzi ^4,7, A Alberca ⁴, Y W Windsor ^4,6, P Beaud ⁵, U Staub ⁴, Diling Zhu ⁸, Sanghoon Song ⁸, J M Glownia ⁸, S L Johnson ^9,10

C Dornes ¹, Y Acremann ², M Savoini ³

¹Institute for Quantum Electronics, Physics Department, ETH Zurich, Zurich, Switzerland. dornesc@phys.ethz.ch.
²Laboratory for Solid State Physics, Physics Department, ETH Zurich, Zurich, Switzerland.
³Institute for Quantum Electronics, Physics Department, ETH Zurich, Zurich, Switzerland.
⁴Swiss Light Source, Paul Scherrer Institute, Villigen, Switzerland.
⁵SwissFEL, Paul Scherrer Institute, Villigen, Switzerland.
⁶Fritz Haber Institute of the Max Planck Society, Berlin, Germany.
⁷Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany.
⁸Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, CA, USA.
⁹Institute for Quantum Electronics, Physics Department, ETH Zurich, Zurich, Switzerland. johnson@phys.ethz.ch.
¹⁰SwissFEL, Paul Scherrer Institute, Villigen, Switzerland. johnson@phys.ethz.ch.

⁰Institute for Quantum Electronics, Physics Department, ETH Zurich, Zurich, Switzerland. dornesc@phys.ethz.ch.

Nature +

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2019年一月4日

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在PubMed上查看摘要

概括

此摘要是机器生成的。

在超快速去磁化中,激光诱导的铁的旋转角动量损失在200 femtosecond内转移到网格中,发射一个应变波. 这揭示了晶格相互作用在秒消磁动态中的关键作用.

科学领域

凝聚物质物理
超快磁性
旋转动力学

背景情况

爱因斯坦-德哈斯效应证明了旋转到机械的角动量转换.
超快速去磁包括光激发时<100 fs的磁化损失.
超快解磁过程中的角动量命运尚未完全理解.

研究的目的

研究激光诱导脱磁过程中角动量转移的时间范围和机制.
确定旋转角动量在 femtosecond 时间尺度上转移的位置.

主要方法

用5秒时间的X射线衍射探测铁.
分析包括将实验X射线数据与模拟和光学数据相匹配.

主要成果

大多数自旋角动量在去磁化过程中被转移到子皮秒时间尺度内的晶格中.
一个横向的应变波被发射到散装材料中.
角动量转移发生在200秒的时间尺度上,占自旋角动量的80%.

结论

网格相互作用在超快的去磁化中起着至关重要的作用.
这些发现阐明了在五秒钟消磁过程中角动量转移的微观机制.

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相关概念视频

Photoelectric Effect

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...

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