Magnetic imaging with femtosecond temporal resolution

被引：16
|
作者：
Li, Jie [1 ]
Lee, Min-Sang [1 ]
He, Wei [1 ]
Redeker, Bjoern [1 ]
Remhof, Arndt [1 ]
Amaladass, Edward [2 ]
Hassel, Christoph [3 ,4 ]
Eimueller, Thomas [1 ,5 ]
机构：
[1] Ruhr Univ Bochum, Inst Expt Phys 4, Jr Res Grp Magnet Microscopy, D-44780 Bochum, Germany
[2] Max Planck Inst Met Res, D-70569 Stuttgart, Germany
[3] Univ Duisburg Essen, Fachbereich Phys, D-47048 Duisburg, Germany
[4] Univ Duisburg Essen, CeNIDE, D-47048 Duisburg, Germany
[5] Univ Appl Sci, Hsch Kempten, D-87435 Kempten, Germany
来源：
REVIEW OF SCIENTIFIC INSTRUMENTS | 2009年 / 80卷 / 07期
关键词：
gadolinium; high-speed optical techniques; interface structure; iron; magnetic multilayers; magnetic transitions; magnetisation; spin dynamics; GD/FE MULTILAYERS; SPIN DYNAMICS; NICKEL; MICROSCOPY; ANISOTROPY; FIELD;
D O I：
10.1063/1.3170448
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
A scanning Kerr microscope with a temporal resolution of < 230 fs and a spatial resolution of 210 nm is presented. Equipped with a large temporal and spatial scanning range of 8 ns and 320 mu m, respectively, the microscope allows studying nonuniform magnetization dynamics on many different time scales over a large area. For demonstration, we study the magnetization dynamics in Fe/Gd multilayer dot arrays exhibiting a spin reorientation transition (SRT) on three different time scales, namely, femtosecond, picosecond, and nanosecond scales. The dynamics on all time scales varies from one dot to another. This is attributed to the high sensitivity of the SRT to the variations of the layer thicknesses and the Fe/Gd interface structure.
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页数：5
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