Ultrafast angular momentum transfer in multisublattice ferrimagnets

被引：93

作者：

Bergeard, N. ^{[1
,2
]}

Lopez-Flores, V. ^{[1
,2
]}

Halte, V. ^{[1
,2
]}

Hehn, M. ^{[3
]}

Stamm, C. ^{[4
,5
]}

Pontius, N. ^{[5
]}

Beaurepaire, E. ^{[1
,2
]}

Boeglin, C. ^{[1
,2
]}

机构：

[1] CNRS, UMR7504, Inst Phys & Chim Mat Strasbourg, F-67034 Strasbourg, France

[2] Univ Strasbourg, F-67034 Strasbourg, France

[3] Univ Henri Poincare, Inst Jean Lamour, UMR 7198, F-54506 Vandoeuvre Les Nancy, France

[4] ETH, Dept Mat, CH-8093 Zurich, Switzerland

[5] Helmholtz Zentrum Berlin Mat & Energie GmbH, Inst Methoden & Instrumentierung Forsch Synchrotr, D-12489 Berlin, Germany

来源：

NATURE COMMUNICATIONS | 2014年 / 5卷

关键词：

RAY CIRCULAR-DICHROISM; SPIN; DEMAGNETIZATION; DYNAMICS; MAGNETIZATION; REVERSAL; NICKEL;

D O I：

10.1038/ncomms4466

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Femtosecond laser pulses can be used to induce ultrafast changes of the magnetization in magnetic materials. However, one of the unsolved questions is that of conservation of the total angular momentum during the ultrafast demagnetization. Here we report the ultrafast transfer of angular momentum during the first hundred femtoseconds in ferrimagnetic Co0.8Gd0.2 and Co0.74Tb0.26 films. Using time-resolved X-ray magnetic circular dichroism allowed for time- resolved determination of spin and orbital momenta for each element. We report an ultrafast quenching of the magnetocrystalline anisotropy and show that at early times the demagnetization in ferrimagnetic alloys is driven by the local transfer of angular momenta between the two exchange- coupled sublattices while the total angular momentum stays constant. In Co0.74Tb0.26 we have observed a transfer of the total angular momentum to an external bath, which is delayed by similar to 150 fs.

引用

页数：7

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