Ultrafast magnetization dynamics in the half-metallic Heusler alloy Co2FeAl

被引：11

作者：

Malik, R. S. ^{[1
]}

Delczeg-Czirjak, E. K. ^{[1
]}

Knut, R. ^{[1
]}

Thonig, D. ^{[3
]}

Vaskivskyi, I ^{[1
]}

Phuyal, D. ^{[1
,2
]}

Gupta, R. ^{[4
]}

Jana, S. ^{[1
]}

Stefanuik, R. ^{[1
]}

Kvashnin, Y. O. ^{[1
]}

Husain, S. ^{[4
]}

Kumar, A. ^{[4
]}

Svedlindh, P. ^{[4
]}

Soderstrom, J. ^{[1
]}

Eriksson, O. ^{[1
,3
]}

Karis, O. ^{[1
]}

机构：

[1] Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden

[2] KTH Royal Inst Technol, Dept Appl Phys, SE-10691 Stockholm, Sweden

[3] Orebro Univ, Sch Sci & Technol, SE-70182 Orebro, Sweden

[4] Uppsala Univ, Dept Mat Sci & Engn, Box 534, SE-75121 Uppsala, Sweden

来源：

PHYSICAL REVIEW B | 2021年 / 104卷 / 10期

基金：

瑞典研究理事会;

关键词：

EXCHANGE INTERACTIONS; SPIN DYNAMICS; EQUATIONS; TRANSPORT; MODEL;

D O I：

10.1103/PhysRevB.104.L100408

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on optically induced, ultrafast magnetization dynamics in the Heusler alloy Co2FeAl, probed by time-resolved magneto-optical Kerr effect. Experimental results are compared to results from electronic structure theory and atomistic spin-dynamics simulations. Experimentally, we find that the demagnetization time (tau(M)) in films of Co2FeAl is almost independent of varying structural order, and that it is similar to that in elemental 3d ferromagnets. In contrast, the slower process of magnetization recovery, specified by tau(R), is found to occur on picosecond time scales, and is demonstrated to correlate strongly with the Gilbert damping parameter (alpha). Based on these results we argue that for Co2FeAl the remagnetization process is dominated by magnon dynamics, something which might have general applicability.

引用

页数：6

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