Angular Momentum Flow During Ultrafast Demagnetization of a Ferrimagnet

被引：51

作者：

Hennecke, Martin ^{[1
]}

Radu, Ilie ^{[1
]}

Abrudan, Radu ^{[2
]}

Kachel, Torsten ^{[2
]}

Holldack, Karsten ^{[2
]}

Mitzner, Rolf ^{[2
]}

Tsukamoto, Arata ^{[3
]}

Eisebitt, Stefan ^{[1
,4
]}

机构：

[1] Max Born Inst Nichtlineare Opt & Kurzzeitspekt, Max Born Str 2A, D-12489 Berlin, Germany

[2] Helmholtz Zentrum Berlin Mat & Energie, Albert Einstein Str 15, D-12489 Berlin, Germany

[3] Nihon Univ, Coll Sci & Technol, 24-1 Narashinodai 7 Chome, Funabashi, Chiba 2748501, Japan

[4] Tech Univ Berlin, Inst Opt & Atomare Phys, Str 17 Juni 135, D-10623 Berlin, Germany

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 122卷 / 15期

关键词：

RAY CIRCULAR-DICHROISM; SPIN SUM-RULE; COULOMB INTERACTION; DYNAMICS; REVERSAL; PROBE;

D O I：

10.1103/PhysRevLett.122.157202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

One of the key processes setting the speed of the ultrafast magnetization phenomena is the angular momentum transfer from and into the spin system. However, the way the angular momentum flows during ultrafast demagnetization and magnetization switching phenomena remains elusive so far. We report on time-resolved soft x-ray magnetic circular dichroism measurements of the ferrimagnetic GdFeCo alloy allowing us to record the dynamics of elemental spin and orbital moments at the Fe and Gd sites during femtosecond laser-induced demagnetization. We observe a complete transfer of spin and orbital angular momentum to the lattice during the first hundreds of femtoseconds of the demagnetization process.

引用

页数：5

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