Microscopic Model for Ultrafast Remagnetization Dynamics

被引：36

作者：

Chimata, Raghuveer ^{[1
]}

Bergman, Anders ^{[1
]}

Bergqvist, Lars ^{[2
]}

Sanyal, Biplab ^{[1
]}

Eriksson, Olle ^{[1
]}

机构：

[1] Uppsala Univ, Dept Phys & Astron, S-75120 Uppsala, Sweden

[2] KTH Royal Inst Technol, Dept Mat Sci & Engn, Stockholm, Sweden

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 15期

基金：

瑞典研究理事会;

关键词：

SPIN DYNAMICS; MAGNETISM; ELECTRONS;

D O I：

10.1103/PhysRevLett.109.157201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this Letter, we provide a microscopic model for the ultrafast remagnetization of atomic moments already quenched above the Stoner-Curie temperature by a strong laser fluence. Combining first-principles density functional theory, atomistic spin dynamics utilizing the Landau-Lifshitz-Gilbert equation, and a three-temperature model, we analyze the temporal evolution of atomic moments as well as the macroscopic magnetization of bcc Fe and hcp Co covering a broad time scale, ranging from femtoseconds to picoseconds. Our simulations show a variety of complex temporal behavior of the magnetic properties resulting from an interplay between electron, spin, and lattice subsystems, which causes an intricate time evolution of the atomic moment, where longitudinal and transversal fluctuations result in a macrospin moment that evolves highly nonmonotonically.

引用

页数：5

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