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Frequency Tunable Surface Magneto Elastic Wav

Event Details

Event Dates: 

Wednesday, June 10, 2015 - 11:00am

Seminar Location: 

  • JILA X317

Speaker Name(s): 

Professor Ra’anan Tobey

Speaker Affiliation(s): 

Zernike Institute for Advanced Materials, University of Groningen
Seminar Type/Subject

Scientific Seminar Type: 

  • JILA Public Seminar

Event Details & Abstract: 

Control of material properties is one of the driving forces in ultrafast optical sciences. The notion that light can influence intrinsic material parameters is founded on a wide range of experiments demonstrating opto-magnetic control, light induced superconductivity, and the photo induced insulator to metal transition in a wide range of materials.  A recent addition to the tool chest of control methodologies is the excitation of acoustic waves, and their affect on intrinsic materials properties; particularly the material magnetization via magnetostrictive effects.

In this talk I will describe our efforts to generate magneto elastic waves in the test material nickel.  Using a combination of the transient grating and Faraday techniques, we probe the magnetic response of the intrinsically acoustic excitations generated in the TG geometry.  The dispersion characteristics of our excitations can be uniquely identified as arising from Rayleigh and Longitudinal acoustic excitations.  At particular values of applied external magnetic field, the acoustic excitation couples to a k-vector tunable ferromagnetic resonance in the film.