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Ultrafast magnetoacoustics in nickel films
Ji-Wan Kim1, Mircea Vomir, Jean-Yves Bigot
1Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, CNRS, Université de Strasbourg, BP 43, 23 rue du Loess, 67034 Strasbourg Cedex 02, France.
Physical Review Letters
|December 11, 2012
Summary
Ultrafast laser pulses generate acoustic waves in nickel films, controlling magnetization dynamics. This magnetoacoustic effect allows precise manipulation of magnetic properties at room temperature.
Area of Science:
- Physics, Materials Science
Background:
- Ultrafast laser excitation can induce dynamic changes in magnetic materials.
- Acoustic waves can interact with magnetic properties through magnetoacoustic effects.
Purpose of the Study:
- To investigate the magnetization dynamics of ferromagnetic nickel films excited by laser-generated acoustic pulses.
- To model and understand the magnetoacoustic response and control of magnetization precession.
Main Methods:
- Using femtosecond laser pulses to generate acoustic pulses in a nickel film.
- Detecting ultrafast magnetization changes from both sides of the film.
- Employing a combined model including the three-temperature model, wave equation, and Landau-Lifshitz-Gilbert equation.
Main Results:
- Acoustic pulses induce strain, modifying magnetic anisotropy and causing magnetization precession.
- Magnetization precession dynamics can be controlled by synchronizing with acoustic echo round-trip times.
- Analysis of time-dependent precession torque reveals the underlying magnetoacoustic physics.
Conclusions:
- Femtosecond laser-generated acoustic pulses offer a method for controlling magnetization dynamics in ferromagnetic films.
- The developed magnetoacoustic model accurately describes the observed phenomena.
- This research opens possibilities for ultrafast magnetic control applications.
