Simultaneous electronic and the magnetic excitation of a ferromagnet by intense THz pulses. (8th January 2016)

• Record Type: Journal Article
• Authors: Shalaby, Mostafa; Vicario, Carlo; Hauri, Christoph P
• Is Part Of: New journal of physics. Volume 18:Number 1(2016:Jan.)
• Publication Date: 2016-01-08
• Subjects: nonlinear terahertz -- magnetization dynamics -- demagnetization; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/18/1/013019
• Languages: English
• ISSNs: 1367-2630

Abstract

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.