Simultaneous electronic and the magnetic excitation of a ferromagnet by intense THz pulses
Abstract
The speed of magnetization reversal is a key feature in magnetic data storage. Magnetic fields from intense THz pulses have been recently shown to induce small magnetization dynamics in a cobalt thin film on the sub-picosecond time scale. Here, we show that at higher field intensities, the THz electric field starts playing a role, strongly changing the dielectric properties of the cobalt thin film. Both the electronic and magnetic responses are found to occur simultaneously, with the electric field response persistent on a time scale orders of magnitude longer than the THz stimulus.
- Publication:
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New Journal of Physics
- Pub Date:
- January 2016
- DOI:
- 10.1088/1367-2630/18/1/013019
- arXiv:
- arXiv:1508.02921
- Bibcode:
- 2016NJPh...18a3019S
- Keywords:
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- Physics - Optics
- E-Print:
- doi:10.1088/1367-2630/18/1/013019