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ETH Zürich - D-PHYS - Solid State Physics - Microstructure Research - Projects - Old projects - Magnetization Dynamics

Magnetization Dynamics

Selected Article

Nat. Comm 7, 13611 (2016)
Critical exponents and scaling invariance in the absence of a critical point
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Proc. R. Soc. A 472, 2195 (2016)
Thirty per cent contrast in secondary-electron imaging by scanning field-emission microscopy
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Phys. Rev. B 89, 014429 (2014)
Domain-wall free energy in Heisenberg ferromagnets
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Phys. Rev. B 87, 115436 (2013)
Scale invariance of a diodelike tunnel junction
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Time Resolved Kerr Microscopy

Y. Acremann, M. Buess, C.H. Back
This project is aimed at obtaining information about the dynamical properties of the magnetization at time scales below 1 ns. Besides inductive methods, the magneto-optic Kerr effect is predestined to be a successful tool in the research of magnetization dynamics at these time scales because of the ease of obtaining short light pulses and the ability to work in external magnetic fields strong enough to cause magnetization reversal.
Within this project we create short but strong local magnetic field pulses and follow the time evolution of the magnetic disturbance that originates from the field pulse (magnetic pump). In order to obtain these field pulses the field source and the magnetic sample have to be kept small in size and thus the fast light pulse has to be focused to submicron spot sizes. For this purpose we built a scanning Kerr microscope with 300 nm spatial resolution and a time resolution of a few picoseconds.
This experiment is a collaboration with the University of Regensburg (Ger), installed and operated today in Regensburg.
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