Ultrafast magnetization dynamics in Co-based Heusler compounds with tuned chemical ordering

被引：15
作者：
Steil, D. [1 ,2 ]
Schmitt, O. [1 ,2 ]
Fetzer, R. [1 ,2 ]
Kubota, T. [3 ]
Naganuma, H. [4 ]
Oogane, M. [4 ]
Ando, Y. [4 ]
Suszka, A. K. [5 ]
Idigoras, O. [5 ]
Wolf, G. [1 ,2 ]
Hillebrands, B. [1 ,2 ]
Berger, A. [5 ]
Aeschlimann, M. [1 ,2 ]
Cinchetti, M. [1 ,2 ]
机构：
[1] Univ Kaiserslautern, Dept Phys, D-67653 Kaiserslautern, Germany
[2] Univ Kaiserslautern, Res Ctr OPTIMAS, D-67653 Kaiserslautern, Germany
[3] Tohoku Univ, WPI Adv Inst Mat Res, Sendai, Miyagi 9808579, Japan
[4] Tohoku Univ, Grad Sch Engn, Dept Appl Phys, Sendai, Miyagi 9808579, Japan
[5] CIC NanoGUNE Consolider, E-20018 San Sebastian, Spain
来源：
NEW JOURNAL OF PHYSICS | 2014年 / 16卷
关键词：
ultrafast demagnetization; Heusler compounds; halfmetallic materials; spin dynamics; magnetic properties; CURIE-TEMPERATURE; REVERSAL; CO2FESI; MOMENT; METALS;
D O I：
10.1088/1367-2630/16/6/063068
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have studied thin film samples of Co2FeSi and Co2MnSi with different degrees of chemical ordering using the time-resolved magneto-optical Kerr effect to elucidate the influence of defects in the crystal structure on magnetization dynamics. Surprisingly, we find that the presence of defects does not influence the optically induced magnetization dynamics on the ultrashort timescale (some 100 fs). However, we observe a second demagnetization stage with a timescale of tens of picoseconds in Co2MnSi for low chemical ordering; that is, a large number of defects. We interpret this second demagnetization step as originating from scattering of mostly thermalized majority electrons into unoccupied minority defect states.
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页数：17
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