Journal
REVIEW OF SCIENTIFIC INSTRUMENTS
Volume 80, Issue 7, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3170448
Keywords
gadolinium; high-speed optical techniques; interface structure; iron; magnetic multilayers; magnetic transitions; magnetisation; spin dynamics
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Funding
- DFG [SFB 491]
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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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