Simultaneous electronic and the magnetic excitation of a ferromagnet by intense THz pulses

Mostafa Shalaby, Carlo Vicario, Christoph P Hauri
2016 New Journal of Physics  
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 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
more » ... d response persistent on a time scale orders of magnitude longer than the THz stimulus
doi:10.1088/1367-2630/18/1/013019 fatcat:bayxpla6njcifnozcvo3q7hsmy