Objective
The aim of this proposal is to study magnetization dynamics at a sub-picosecond time scale. Though traditionally it was considered that the dynamics in magnetism is dominated by the spin-lattice relaxation processes (0.03-1.0 ns), it is clear that at very short timescales (< 1ps), spin-spin and electron-electron interactions play a dominant role.
This so far unexplored topic has become feasible by the availability of tunable, amplified femtosecond lasers. Using fs laser pulses one can:
1) excite the electrons in a ferromagnetic system far (thousands of degrees) out of thermal equilibrium with the lattice;
2) probe the related spin dynamics on a femtosecond time scale;
3) generate magnetic fields on a picosecond time scale, and;
4) try to reverse the magnetization on a picosecond time scale.
We will use our expertise in picosecond gated STM for the generation of the ultrashort magnetic field pulses. The spin dynamics will be probed by time-resolved linear and nonlinear magneto-optical techniques. The latter one (magnetization-induced second harmonic generation - MSHG) is especially useful for studies of multilayer systems because of its strong interface sensitivity.
The research will be combined in the workpackages:
W1. Spin life-time in semiconductors (GaAs, CdMnTe and ZnMnTe) and its peculiarities near semiconductor-ferromagnet interfaces;
W2. Creation of ultra fast magnetic field pulses;
W3. Magnetization reversal via precession using ultra fast magnetic field pulses;
W4. Spin dynamics versus hot electron dynamics on surfaces and interfaces of ferromagnetic metals (Ni, Fe, Co, CoNi/Pt);
W5. Development of ultra fast magneto-optical imaging.
The expected achievements of this project are:
1. Study of spin-spin and spin-lattice interaction processes in various systems;
2. Understanding of fundamental limits for ultra fast magnetization reversal;
3. Development of new methods to study ultra fast spin dynamics.
In the long term, this may also have implications for the field of magnetic sensors and high speed magnetic recording and reading.
Fields of science (EuroSciVoc)
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Programme(s)
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Topic(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding Scheme
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Coordinator
6525 ED Nijmegen
Netherlands
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.